{"id":2358,"date":"2026-01-09T11:53:23","date_gmt":"2026-01-09T11:53:23","guid":{"rendered":"https:\/\/cnkuangya.com\/?p=2358"},"modified":"2026-04-24T15:48:57","modified_gmt":"2026-04-24T07:48:57","slug":"dc-fuse-sizing","status":"publish","type":"post","link":"https:\/\/cnkuangya.com\/ko\/blog\/dc-fuse-sizing\/","title":{"rendered":"DC \ud4e8\uc988 \ud06c\uae30 \uc870\uc815: \uacc4\uc0b0\uae30 \ubc0f \uc608\uc81c\uac00 \ud3ec\ud568\ub41c \ub2e8\uacc4\ubcc4 \uac00\uc774\ub4dc"},"content":{"rendered":"

Introduction: The High Cost of a ‘Close Enough’ Calculation<\/h2>\n\n\n\n

An experienced solar installer, let’s call him Dave, was facing a recurring nightmare. On a 100kW commercial rooftop system he\u2019d completed three months prior, fuses were blowing on perfectly sunny days. The client was losing production, and Dave\u2019s team was wasting time and money on service calls to replace 20A fuses. The initial diagnosis was a bad batch of fuses. But after the third call-out, the real problem became clear. The system was designed with new high-efficiency 550W panels with a short-circuit current (Isc) of 13.9A. Dave’s lead engineer, relying on old habits, had sized the string fuses using a simple 1.25x multiplier, landing on 17.4A and rounding up to a standard 20A fuse.<\/p>\n\n\n\n

\uadf8\uac00 \ub193\uce5c \uac83\uc740 \uc5f0\uc18d \ubd80\ud558\ub97c \ubaa8\ub450 \uace0\ub824\ud55c \uc644\uc804\ud55c \ucf54\ub4dc \uc758\ubb34 \uacc4\uc0b0\uc774\uc5c8\uc2b5\ub2c8\ub2e4.\u00a0\ubc0f<\/em>\u00a0\ud587\ube5b\uc5d0 \ud760\ubed1 \uc816\uc740 \ud328\ub110\uc774 \uc77c\uc2dc\uc801\uc73c\ub85c \uba85\ud310 \uc815\uaca9\ubcf4\ub2e4 \ud6e8\uc52c \ub192\uc740 \ucd9c\ub825\uc744 \ub0bc \uc218 \uc788\ub294 \uc2e4\uc81c \ud0dc\uc591\uad11 \uc870\ub3c4 \uae09\uc0c1\uc2b9 \uc870\uac74\uc785\ub2c8\ub2e4. \ub9d1\uace0 \ubc1d\uc740 \uc624\ud6c4\uc5d0\ub294 \uc5b4\ub808\uc774\uc758 \uc804\ub958\uac00 \ud4e8\uc988 \uc18c\uc790\ub97c \ud53c\ub85c\ud558\uac8c \ud560 \ub9cc\ud07c \ucda9\ubd84\ud788 \uc624\ub7ab\ub3d9\uc548 20A\ub97c \uc57d\uac04 \ub118\uc5c8\uc2b5\ub2c8\ub2e4. \uc774 \ubb38\uc81c\ub97c \ud574\uacb0\ud558\uae30 \uc704\ud574 \ucef4\ubc14\uc774\ub108 \ubc15\uc2a4\ub97c 25A\ub85c \uc644\uc804\ud788 \ub2e4\uc2dc \ud4e8\uc9d5\ud588\uc2b5\ub2c8\ub2e4. \ud4e8\uc988<\/a>, \ud558\uc9c0\ub9cc \uadf8 \ud53c\ud574\ub294 \uace0\uac1d \ubd88\ub9cc, \uc218\uc775\ub960 \ud558\ub77d, \uadf8\ub9ac\uace0 \ud798\ub4e4\uac8c \uc5bb\uc740 \uad50\ud6c8\uc774\uc5c8\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n

“Close enough” is a dangerous phrase in electrical design. In the world of high-power Direct Current (DC) systems\u2014from utility-scale solar farms to battery energy storage (BESS) and electric vehicle (EV) fast chargers\u2014precise, code-compliant fuse sizing is not a recommendation; it is a non-negotiable pillar of safety, reliability, and financial viability. This guide provides a step-by-step, professional methodology for getting it right, every time.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Part 1: The Fundamentals – Why DC Fusing Demands More Respect<\/h2>\n\n\n\n

Before diving into calculations, it’s crucial to understand why DC overcurrent protection is fundamentally more challenging than its AC counterpart. The difference lies in the physics of an electrical arc.<\/p>\n\n\n\n

In an AC circuit, the current naturally passes through zero 100 or 120 times every second. This zero-crossing provides a momentary opportunity for an arc\u2014the plasma bridge that forms when a fuse element melts\u2014to extinguish. AC fuses are designed to leverage this recurring “off” switch.<\/p>\n\n\n\n

DC\ub294 \uac00\ucc28\uc5c6\uc2b5\ub2c8\ub2e4. \uc81c\ub85c \ud06c\ub85c\uc2f1\uc774 \uc5c6\uc2b5\ub2c8\ub2e4. DC \ud4e8\uc988\uac00 \uc5f4\ub9ac\uba74 \uc5f0\uc18d\uc801\uc778 \uace0\uc5d0\ub108\uc9c0 \uc544\ud06c\uac00 \ud615\uc131\ub429\ub2c8\ub2e4. \uc774 \uc544\ud06c\ub294 \ubcf8\uc9c8\uc801\uc73c\ub85c \uc628\ub3c4\uac00 10,000\u00b0C\ub97c \ucd08\uacfc\ud558\ub294 \ud50c\ub77c\uc988\ub9c8 \uc81c\ud2b8\uc785\ub2c8\ub2e4. \uc774\ub97c \uc9c4\uc555\ud558\ub824\uba74 DC \ud4e8\uc988\ub294 \uc804\uc555 \uc218\uc694\uac00 \uc2dc\uc2a4\ud15c\uc758 \uc804\uc555\uc744 \ucd08\uacfc\ud560 \ub54c\uae4c\uc9c0 \uc544\ud06c\ub97c \ub298\ub9b4 \uc218 \uc788\uc744 \ub9cc\ud07c \uacac\uace0\ud574\uc57c \ud558\uba70, \ub3d9\uc2dc\uc5d0 \ub9c9\ub300\ud55c \uc5f4 \uc5d0\ub108\uc9c0\ub97c \ud761\uc218\ud558\uc5ec \ud50c\ub77c\uc988\ub9c8\ub97c \ub0c9\uac01\uc2dc\ucf1c\uc57c \ud569\ub2c8\ub2e4. \uadf8\ub807\uae30 \ub54c\ubb38\uc5d0 gPV(\ud0dc\uc591\uad11) \ubc0f \uae30\ud0c0 DC \ub4f1\uae09 \ud4e8\uc988\uc5d0\ub294 \uc885\uc885 \ud2b9\uc218 \uc11d\uc601 \ubaa8\ub798 \ud544\ub7ec\uac00 \ud3ec\ud568\ub418\uc5b4 \uc788\uc73c\uba70, \uc774\ub294 \ud480\uad6c\ub77c\uc774\ud2b8\ub77c\ub294 \uc720\ub9ac\uc640 \uac19\uc740 \ubb3c\uc9c8\ub85c \ub179\uc544 \uc544\ud06c\ub97c \uc9c8\uc2dd\uc2dc\ud0b5\ub2c8\ub2e4.<\/p>\n\n\n\n

DC \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0\uc11c AC \ud4e8\uc988\ub97c \uc0ac\uc6a9\ud558\ub294 \uac83\uc740 \uce58\uba85\uc801\uc778 \uc624\ub958\uc785\ub2c8\ub2e4. \uc624\ub958\ub97c \uc81c\uac70\ud558\uc9c0 \ubabb\ud558\uc5ec \uc544\ud06c\uac00 \uc9c0\uc18d\ub418\uace0 \ud4e8\uc988 \ubcf8\uccb4\uac00 \ud3ed\ubc1c\ud560 \uac00\ub2a5\uc131\uc774 \uc788\uc73c\uba70 \uc2ec\uac01\ud55c \ud654\uc7ac \uc704\ud5d8\uc73c\ub85c \uc774\uc5b4\uc9c8 \uc218 \uc788\uc2b5\ub2c8\ub2e4. DC \ud4e8\uc988\ub97c \uc62c\ubc14\ub974\uac8c \uc9c0\uc815\ud558\ub824\uba74 \ub124 \uac00\uc9c0 \uc8fc\uc694 \ub9e4\uac1c\ubcc0\uc218\ub97c \uc219\uc9c0\ud574\uc57c \ud569\ub2c8\ub2e4:<\/p>\n\n\n\n

    \n
  • \uc804\uc555 \uc815\uaca9(VDC):<\/strong>\u00a0The fuse’s voltage rating must be equal to or greater than the maximum system DC voltage. This includes accounting for open-circuit voltage (Voc) at the coldest expected temperatures for solar arrays.<\/li>\n\n\n\n
  • \uc5f0\uc18d \uc804\ub958 \uc815\uaca9(\uc554\ud398\uc5b4):<\/strong>\u00a0This is the nameplate value of the fuse (e.g., “15A”). It indicates the amount of current the fuse can carry indefinitely without degrading. It is\u00a0not<\/em>\u00a0\uc989\uc2dc \ubd88\uc5b4\uc624\ub294 \uc804\ub958\uc785\ub2c8\ub2e4.<\/li>\n\n\n\n
  • \ucc28\ub2e8 \ub4f1\uae09(kA):<\/strong>\u00a0Also known as Breaking Capacity, this is the maximum fault current the fuse can safely interrupt without rupturing. For a battery bank, the prospective short-circuit current can be thousands of amps. The fuse’s interrupting rating must exceed this value.<\/li>\n\n\n\n
  • \ud4e8\uc988 \uc18d\ub3c4(\uc2dc\uac04-\uc804\ub958 \uace1\uc120):<\/strong>\u00a0This defines how quickly a fuse opens at different levels of overcurrent. Fuses are not simple on\/off devices. An “ultra-rapid” semiconductor fuse might open in milliseconds to protect sensitive electronics, while a “time-delay” fuse will withstand temporary inrush currents from motors without nuisance blowing. For solar applications, gPV-rated fuses are designed with a specific curve that tolerates irradiance spikes but protects against dangerous reverse currents.<\/li>\n<\/ul>\n\n\n\n

    2\ubd80: \ud575\uc2ec \uacf5\uc2dd \ud574\ub3c5\ud558\uae30: NEC\uc640 IEC \ube44\uad50<\/h2>\n\n\n\n

    The “1.56 multiplier” is a cornerstone of DC fuse sizing in North America, but many professionals misapply it or don’t understand its origin. It’s not an arbitrary number; it’s a safety factor derived directly from the National Electrical Code (NEC).<\/p>\n\n\n\n

    NEC 1.56 \uc2b9\uc218 \uc124\uba85<\/h3>\n\n\n\n

    1.56 \uacc4\uc218\ub294 \ud0dc\uc591\uad11 PV \uc2dc\uc2a4\ud15c\uc5d0 \ub300\ud574 NEC 690\uc870\uc5d0 \uaddc\uc815\ub41c \ub300\ub85c \ub450 \uac1c\uc758 \uac1c\ubcc4 125% \uc2b9\uc218\ub97c \uc5f0\uc18d\uc801\uc73c\ub85c \uc801\uc6a9\ud558\uc5ec \uc0b0\ucd9c\ud55c \uac83\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n

      \n
    1. \ucd5c\ub300 \uc804\ub958\uc758 \uacbd\uc6b0 125%(NEC 690.8(A)(1)):<\/strong>\u00a0This first step is to calculate the “maximum circuit current.” The code recognizes that solar panels under certain conditions (e.g., cold, sunny days with reflected light, or “cloud-edge effect”) can produce more than their rated short-circuit current (Isc). This multiplier establishes a baseline for conductor and OCPD (Overcurrent Protection Device) sizing.\n
        \n
      • \ucd5c\ub300 \uc804\ub958 = Isc \u00d7 1.25<\/em><\/li>\n<\/ul>\n<\/li>\n\n\n\n
      • \uc5f0\uc18d \uadfc\ubb34\uc6a9 125%(NEC 690.9(B)):<\/strong>\u00a0The second step treats this “maximum current” as a continuous load. A continuous load is one that can operate for three hours or more, which is standard for a solar array. The NEC requires that overcurrent protection for continuous loads be sized to 125% of that load.\n
          \n
        • \ucd5c\uc18c \ud4e8\uc988 \uc815\uaca9 = \ucd5c\ub300 \uc804\ub958 \u00d7 1.25<\/em><\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n

          \uc774 \ub450 \ub2e8\uacc4\ub97c \uacb0\ud569\ud558\uba74 \uc804\uccb4 \uc0c1\ud669\uc744 \ud30c\uc545\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4:<\/p>\n\n\n\n

          \ucd5c\uc18c \ud4e8\uc988 \uc815\uaca9 = (Isc \u00d7 1.25) \u00d7 1.25 = Isc \u00d7 1.5625<\/strong><\/p>\n\n\n\n

          \uc2e4\uc6a9\uc801\uc778 \ubaa9\uc801\uc744 \uc704\ud574 \ubc18\uc62c\ub9bc\ud558\uba74 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4. 1.56<\/strong>. \uc774 \ucd5c\uc18c \ub4f1\uae09\uc744 \uacc4\uc0b0\ud55c \ud6c4\uc5d0\ub294 \ud56d\uc0c1 \ubc18\uc62c\ub9bc\ud574\uc57c \ud569\ub2c8\ub2e4. up<\/em> \ub97c \ub2e4\uc74c \ud45c\uc900 \ud4e8\uc988 \ud06c\uae30(\uc608: 10A, 15A, 20A, 25A, 30A)\ub85c \ubcc0\uacbd\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n

          IEC \uc811\uadfc \ubc29\uc2dd\uacfc\uc758 \ube44\uad50<\/h3>\n\n\n\n

          NEC\ub294 \uba85\ud655\ud558\uace0 \uaddc\ubc94\uc801\uc778 \uc2b9\uc218\ub97c \uc81c\uacf5\ud558\uc9c0\ub9cc, \uad6d\uc81c \ud45c\uc900 IEC 62548\uc740 \ubcf4\ub2e4 \uc720\uc5f0\ud55c \ubc94\uc704\ub97c \uc81c\uacf5\ud569\ub2c8\ub2e4. IEC \ud45c\uc900\uc5d0 \ub530\ub974\uba74 \ud4e8\uc988 \uc815\uaca9(I_n)\uc740 \ub2e4\uc74c \uaddc\uce59\uc5d0 \ub530\ub77c \uc124\uacc4 \uc804\ub958(I_B)\uc640 \ucf00\uc774\ube14 \uc554\ud398\uc5b4 \uc6a9\ub7c9(I_z) \uc0ac\uc774\uc5d0 \uc18d\ud574\uc57c \ud569\ub2c8\ub2e4. I_B \u2264 I_n \u2264 I_z<\/code>.<\/p>\n\n\n\n

          For PV string protection, IEC 62548 recommends sizing the fuse rating between 1.5 and 2.4 times the module’s Isc.<\/p>\n\n\n\n

            \n
          • IEC \ud4e8\uc988 \ud06c\uae30 \uc870\uc815:<\/strong>\u00a0\ucd5c\uc18c \ud4e8\uc988 \uc815\uaca9 = Isc \u00d7 (1.5 ~ 2.4)<\/em><\/li>\n<\/ul>\n\n\n\n

            \uc774 \ubc94\uc704\ub97c \ud1b5\ud574 \uc124\uacc4\uc790\ub294 \ud604\uc9c0 \ud658\uacbd \uc870\uac74, \uc628\ub3c4 \ubc0f \ud2b9\uc815 \ubaa8\ub4c8 \ud2b9\uc131\uc5d0 \ub530\ub77c \ubcf4\ud638\ub97c \ucd5c\uc801\ud654\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ud558\uc9c0\ub9cc NEC\uac00 \uad00\ud560\ud558\ub294 \ud504\ub85c\uc81d\ud2b8\uc758 \uacbd\uc6b0\uc5d0\ub294 1.56 \uc2b9\uc218\ub294 \ud544\uc218\uc785\ub2c8\ub2e4.<\/strong><\/p>\n\n\n\n

            3\ubd80: \ub2e8\uacc4\ubcc4 \ud06c\uae30 \uc870\uc815 \uacc4\uc0b0\uae30<\/h2>\n\n\n\n

            \uc790\ub3d9\ud654\ub41c \ub3c4\uad6c\uac00 \uc544\ub2c8\ub77c \ubaa8\ub4e0 \uc911\uc694\ud55c \ubcc0\uc218\ub97c \uace0\ub824\ud558\ub294 6\ub2e8\uacc4\uc758 \uc218\ub3d9 \ud504\ub85c\uc138\uc2a4\ub77c\uace0 \uc0dd\uac01\ud558\uc138\uc694. \uc774 \uc6cc\ud06c\ud50c\ub85c\uc6b0\ub97c \ub530\ub974\uba74 \uc624\ub958\ub97c \ubc29\uc9c0\ud558\uace0 \uc548\uc804\ud558\uace0 \uc2e0\ub8b0\ud560 \uc218 \uc788\uc73c\uba70 \ucf54\ub4dc\ub97c \uc900\uc218\ud558\ub294 \ub514\uc790\uc778\uc744 \ub9cc\ub4e4 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n

            1\ub2e8\uacc4: \ucd5c\ub300 \uc124\uacc4 \uc804\ub958 \uacb0\uc815<\/strong>
            \ud68c\ub85c\uac00 \uc804\ub2ec\ud560 \uc218 \uc788\ub294 \ucd5c\ub300 \uc5f0\uc18d \uc804\ub958\ub97c \ud30c\uc545\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n

              \n
            • For solar strings: Use the panel’s short-circuit current (Isc).<\/li>\n\n\n\n
            • For battery banks: Use the inverter’s maximum continuous DC input current.<\/li>\n\n\n\n
            • For DC loads (like EV chargers): Use the equipment’s nameplate maximum DC current rating.<\/li>\n<\/ul>\n\n\n\n

              2\ub2e8\uacc4: \uc628\ub3c4 \uac10\uc18d \uacc4\uc218 \uc801\uc6a9<\/strong>
              Fuses are rated for a specific ambient temperature (usually 25\u00b0C or 40\u00b0C). If they are installed in a hotter environment, like a sun-baked combiner box on a roof, their effective current-carrying capacity is reduced. You must consult the fuse manufacturer’s datasheet for derating curves or tables. For example, a 20A fuse in a 65\u00b0C environment might only have an effective rating of 17.4A. You may need to select a larger fuse to compensate.<\/p>\n\n\n\n

              3\ub2e8\uacc4: \uad00\ub828 \ucf54\ub4dc \uc2b9\uc218 \uc801\uc6a9\ud558\uae30<\/strong>
              \uad00\ub9ac \uaddc\uc815\uc5d0 \ub530\ub77c \ud544\uc694\ud55c \uc548\uc804\uc728\uc744 \uc801\uc6a9\ud558\uc138\uc694.<\/p>\n\n\n\n

                \n
              • NEC \ud638\ud658 \ud0dc\uc591\uad11\uc758 \uacbd\uc6b0: Isc\uc5d0 1.56\uc744 \uacf1\ud569\ub2c8\ub2e4.<\/li>\n\n\n\n
              • NEC\uc5d0 \ub530\ub978 \uae30\ud0c0 \uc5f0\uc18d DC \ubd80\ud558\uc758 \uacbd\uc6b0: \ucd5c\ub300 \uc124\uacc4 \uc804\ub958\uc5d0 1.25\ub97c \uacf1\ud569\ub2c8\ub2e4.<\/li>\n\n\n\n
              • IEC \ud504\ub85c\uc81d\ud2b8\uc758 \uacbd\uc6b0: \uc124\uacc4\uc5d0 \ub530\ub77c 1.5\uc5d0\uc11c 2.4 \uc0ac\uc774\uc758 \uc2b9\uc218\ub97c \uc0ac\uc6a9\ud569\ub2c8\ub2e4.<\/li>\n<\/ul>\n\n\n\n

                4\ub2e8\uacc4: \ub2e4\uc74c \ud45c\uc900 \ud4e8\uc988 \ud06c\uae30 \uc120\ud0dd<\/strong>
                After applying multipliers, you’ll have a minimum required fuse rating. You must select the next \ud45c\uc900<\/em> \uacc4\uc0b0\ud55c \uac12\uacfc \uac19\uac70\ub098 \ub354 \ud070 \uc2dc\uc911\uc5d0\uc11c \ud310\ub9e4\ub418\ub294 \ud4e8\uc988 \ud06c\uae30\uc785\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4 \uacc4\uc0b0 \uacb0\uacfc \ucd5c\uc18c \uc815\uaca9\uc774 22.54A\uc778 \uacbd\uc6b0 25A \ud4e8\uc988\ub97c \uc120\ud0dd\ud574\uc57c \ud569\ub2c8\ub2e4.<\/p>\n\n\n\n

                5\ub2e8\uacc4: \ub3c4\uccb4 \ubc0f \uc7a5\ube44 \ubcf4\ud638 \ud655\uc778<\/strong>
                \ud4e8\uc988\uc5d0\ub294 \uc804\uc120 \ubcf4\ud638\uc640 \uc7a5\ube44 \ubcf4\ud638\ub77c\ub294 \ub450 \uac00\uc9c0 \uc5ed\ud560\uc774 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n

                  \n
                • \uc804\uc120 \ubcf4\ud638:<\/strong>\u00a0\ud4e8\uc988 \uc815\uaca9\uc740 \uc5f0\uacb0\ub41c \uc804\uc120\uc758 \uc6a9\ub7c9\uc744 \ucd08\uacfc\ud574\uc11c\ub294 \uc548 \ub429\ub2c8\ub2e4. 20A\ub9cc \uc815\uaca9\uc778 \uc804\uc120\uc5d0 30A \ud4e8\uc988\ub97c \uc0ac\uc6a9\ud558\uba74 \ud654\uc7ac \uc704\ud5d8\uc774 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n\n\n\n
                • \uc7a5\ube44 \ubcf4\ud638:<\/strong>\u00a0The fuse rating must not exceed the maximum OCPD rating specified by the equipment manufacturer. Solar panels, for instance, have a “Maximum Series Fuse Rating” on their datasheet (typically 15A to 30A). Exceeding this voids the warranty and can lead to module damage.<\/li>\n<\/ul>\n\n\n\n

                  6\ub2e8\uacc4: \ucc28\ub2e8 \uc815\uaca9(kA) \ud655\uc778<\/strong>
                  Finally, verify that the fuse’s Interrupting Rating (kA) is greater than the available short-circuit current at that point in the system. This is especially critical for battery systems, which can deliver massive fault currents. A quick estimate for a battery’s prospective short-circuit current (I_sc) is I_sc = \ubc30\ud130\ub9ac \uc804\uc555 \/ \ucd1d \ub8e8\ud504 \uc800\ud56d<\/code>. \uacc4\uc0b0\ub41c I_sc\uac00 16,000A(16kA)\uc778 \uacbd\uc6b0, \ucc28\ub2e8 \uc815\uaca9\uc774 10kA\uc778 \ud4e8\uc988\ub294 \ubd80\uc801\uc808\ud558\uba70 \uc2ec\ud558\uac8c \uace0\uc7a5\ub0a0 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n

                  4\ubd80: \uacc4\uc0b0\uc744 \uc0ac\uc6a9\ud55c \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uc608\uc81c<\/h2>\n\n\n\n

                  Let’s apply this six-step process to three common high-power DC applications.<\/p>\n\n\n\n

                  \"\"<\/figure>\n\n\n\n

                  A. \ud0dc\uc591\uad11 \ubc1c\uc804 \uc2dc\uc2a4\ud15c(\uc2a4\ud2b8\ub9c1 \ubc0f \uacb0\ud569\uae30 \uc735\ud569)<\/h3>\n\n\n\n

                  \uc138 \uac1c \uc774\uc0c1\uc758 \uc2a4\ud2b8\ub9c1\uc774 \ubcd1\ub82c\ub85c \uc5f0\uacb0\ub41c \ud0dc\uc591\uad11 \uc5b4\ub808\uc774\uc758 \uacbd\uc6b0, NEC 690.9(A)\uc5d0\uc11c\ub294 \uac01 \uc2a4\ud2b8\ub9c1\uc5d0 \uac1c\ubcc4 \ud4e8\uc988\ub97c \uc0ac\uc6a9\ud558\ub3c4\ub85d \uaddc\uc815\ud558\uace0 \uc788\uc2b5\ub2c8\ub2e4. \uc774\ub807\uac8c \ud558\uba74 \ud55c \uc2a4\ud2b8\ub9c1\uc758 \uacb0\ud568\uc73c\ub85c \uc778\ud574 \uc815\uc0c1 \uc2a4\ud2b8\ub9c1\uc5d0\uc11c \ub300\uaddc\ubaa8 \uc5ed\uc804\ub958\uac00 \ud750\ub974\ub294 \uac83\uc744 \ubc29\uc9c0\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n

                  \uc2dc\ub098\ub9ac\uc624:<\/strong> 450W \ud328\ub110\uc744 \uc0ac\uc6a9\ud558\ub294 \uc0c1\uc5c5\uc6a9 \uc625\uc0c1 \uc2dc\uc2a4\ud15c\uc744 \uc704\ud55c \uc2a4\ud2b8\ub9c1 \ud4e8\uc9d5\uc744 \uc124\uacc4\ud558\uc138\uc694.<\/p>\n\n\n\n

                    \n
                  • \ud328\ub110 \ub370\uc774\ud130\uc2dc\ud2b8 Isc: 12.8A<\/li>\n\n\n\n
                  • Panel “Maximum Series Fuse Rating”: 25A<\/li>\n\n\n\n
                  • \uc804\uc120: 10AWG PV \uc640\uc774\uc5b4(40A \uc815\uaca9)<\/li>\n\n\n\n
                  • \ucef4\ubc14\uc774\ub108 \ubc15\uc2a4 \ub0b4 \uc8fc\ubcc0 \uc628\ub3c4: 50\u00b0C(122\u00b0F)<\/li>\n\n\n\n
                  • Fuse Manufacturer’s Derating at 50\u00b0C: 0.92<\/li>\n<\/ul>\n\n\n\n

                    \uacc4\uc0b0:<\/strong><\/p>\n\n\n\n

                      \n
                    1. \ucd5c\ub300 \uc124\uacc4 \uc804\ub958:<\/strong>\u00a0\uae30\ubcf8\uc740 \ud328\ub110 Isc\uc785\ub2c8\ub2e4:\u00a012.8A<\/strong>.<\/li>\n\n\n\n
                    2. \uc628\ub3c4 \uac10\uc18c:<\/strong>\u00a0\ud4e8\uc988 \ud06c\uae30\ub97c \ucc3e\uc544\uc57c \ud569\ub2c8\ub2e4,\u00a0\uc774\ud6c4<\/em>\u00a0derating, still meets our code requirement. We’ll apply the derating factor later during verification.<\/li>\n\n\n\n
                    3. \ucf54\ub4dc \uc2b9\uc218(NEC):<\/strong>\n
                        \n
                      • \ucd5c\uc18c \uc694\uad6c \ub4f1\uae09 = 12.8A \u00d7 1.56 = 19.97A<\/code><\/li>\n<\/ul>\n<\/li>\n\n\n\n
                      • \ud45c\uc900 \ud4e8\uc988 \ud06c\uae30\ub97c \uc120\ud0dd\ud569\ub2c8\ub2e4:<\/strong>\u00a019.97A\uc5d0\uc11c \ub2e4\uc74c \ud45c\uc900 \ud06c\uae30\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.\u00a020A<\/strong>.<\/li>\n\n\n\n
                      • \ubcf4\ud638 \ud655\uc778:<\/strong>\n
                          \n
                        • \uc628\ub3c4 \ud655\uc778:<\/strong>\u00a0Now, let’s see if the 20A fuse is sufficient at 50\u00b0C.\n
                            \n
                          • \uc720\ud6a8 \ud4e8\uc988 \uc815\uaca9 = 20A \u00d7 0.92(\ubd80\ud558 \uacbd\uac10 \uacc4\uc218) = 18.4A<\/code><\/li>\n\n\n\n
                          • \uc774\uac83\uc740\u00a0\ubbf8\ub9cc<\/em>\u00a0\ucd5c\uc18c 19.97A\uac00 \ud544\uc694\ud569\ub2c8\ub2e4. 20A \ud4e8\uc988\ub294 \ub108\ubb34 \uc791\uc544\uc11c \ud2b8\ub9bd\uc744 \uc77c\uc73c\ud0ac \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
                          • \uc218\uc815\ub41c \uc120\ud0dd:<\/strong>\u00a0\ub2e4\uc74c \uc0ac\uc774\uc988\ub97c \uc120\ud0dd\ud574\uc57c \ud569\ub2c8\ub2e4.\u00a025A \ud4e8\uc988<\/strong>.\n
                              \n
                            • \uc720\ud6a8 \ud4e8\uc988 \uc815\uaca9 = 25A \u00d7 0.92 = 23A<\/code><\/li>\n\n\n\n
                            • \uc774\ub294 19.97A\ubcf4\ub2e4 \ud06c\ubbc0\ub85c \uc774 \uace0\uc628 \ud658\uacbd\uc5d0\ub294 25A \ud4e8\uc988\uac00 \uc801\ud569\ud569\ub2c8\ub2e4.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
                            • \uc804\uc120 \ubcf4\ud638:<\/strong>\u00a025A \ud4e8\uc988 \uc815\uaca9\uc740 10AWG \uc640\uc774\uc5b4\uc758 40A \uc554\ud398\uc5b4 \uc6a9\ub7c9\ubcf4\ub2e4 \ud6e8\uc52c \ub0ae\uc2b5\ub2c8\ub2e4. \u2713<\/li>\n\n\n\n
                            • \uc7a5\ube44 \ubcf4\ud638:<\/strong>\u00a0The 25A fuse rating is equal to the panel’s “Maximum Series Fuse Rating” of 25A. \u2713<\/li>\n<\/ul>\n<\/li>\n\n\n\n
                            • \ubc29\ud574 \ub4f1\uae09\uc744 \ud655\uc778\ud569\ub2c8\ub2e4:<\/strong>\u00a0\uc2a4\ud2b8\ub9c1 \uc218\uc900 \uc624\ub958\uc758 \uacbd\uc6b0 \uc0ac\uc6a9 \uac00\ub2a5\ud55c \uc624\ub958 \uc804\ub958\ub294 \ub2e4\ub978 \ubcd1\ub82c \uc2a4\ud2b8\ub9c1\uc758 Isc\ub97c \ud569\ud55c \uac12\uc785\ub2c8\ub2e4. \ucd1d 10\uac1c\uc758 \uc2a4\ud2b8\ub9c1\uc774 \uc788\ub294 \uacbd\uc6b0 \ucd5c\ub300 \uacb0\ud568 \uc804\ub958\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.\u00a09 \uc2a4\ud2b8\ub9c1 \u00d7 12.8A \u2248 115A<\/code>. \ud45c\uc900 gPV \ud4e8\uc988\uc758 \ucc28\ub2e8 \uc815\uaca9\uc740 10kA \uc774\uc0c1\uc73c\ub85c \ucda9\ubd84\ud569\ub2c8\ub2e4. \u2713<\/li>\n<\/ol>\n\n\n\n

                              \ucd5c\uc885 \uc120\ud0dd:<\/strong> 25A, 1000VDC gPV \ub4f1\uae09 \ud4e8\uc988.<\/strong><\/p>\n\n\n\n

                              B. \ubc30\ud130\ub9ac \uc5d0\ub108\uc9c0 \uc800\uc7a5 \uc2dc\uc2a4\ud15c(BESS)<\/h3>\n\n\n\n

                              \ub300\ud615 \ub9ac\ud2ac \uc774\uc628 \ubc30\ud130\ub9ac \ubc45\ud06c\uc758 \ud4e8\uc988\ub294 \uc8fc\ub85c \uce58\uba85\uc801\uc778 \ub2e8\ub77d\uc744 \ubc29\uc9c0\ud558\ub294 \ub370 \uc0ac\uc6a9\ub429\ub2c8\ub2e4. \ud4e8\uc988\ub294 \uc218\ub9cc \uc554\ud398\uc5b4\uc758 \uc804\ub958\ub97c \ucc28\ub2e8\ud560 \uc218 \uc788\uc5b4\uc57c \ud569\ub2c8\ub2e4.<\/p>\n\n\n\n

                              \uc2dc\ub098\ub9ac\uc624:<\/strong> 5,000W \uc778\ubc84\ud130\/\ucda9\uc804\uae30\uc5d0 \uc5f0\uacb0\ub41c 48V, 400Ah LiFePO4 \ubc30\ud130\ub9ac \ubc45\ud06c\uc758 \uc8fc DC \ud4e8\uc988\ub97c \uc120\ud0dd\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n

                                \n
                              • \uc778\ubc84\ud130 \ucd5c\ub300 \uc5f0\uc18d DC \uc804\ub958: 125A<\/li>\n\n\n\n
                              • \uc778\ubc84\ud130 \ud6a8\uc728: 95%<\/li>\n\n\n\n
                              • \ucd5c\uc800 \ubc30\ud130\ub9ac \uc791\ub3d9 \uc804\uc555: 44V<\/li>\n\n\n\n
                              • \uacc4\uc0b0\ub41c \uc608\uc0c1 \ub2e8\ub77d \uc804\ub958(\ubc30\ud130\ub9ac \uc0ac\uc591 \ubc0f \ucf00\uc774\ube14 \uc800\ud56d\uc5d0\uc11c):\u00a018,000A(18kA)<\/strong><\/li>\n\n\n\n
                              • \uc640\uc774\uc5b4: 2\/0 AWG(190A \uc815\uaca9)<\/li>\n<\/ul>\n\n\n\n

                                \uacc4\uc0b0:<\/strong><\/p>\n\n\n\n

                                  \n
                                1. \ucd5c\ub300 \uc124\uacc4 \uc804\ub958:<\/strong>\u00a0We must calculate the inverter’s max current draw at the lowest battery voltage, where current is highest.\n
                                    \n
                                  • \ucd5c\ub300 \uc18c\ube44 \uc804\ub825 = 5000W \/ 0.95(\ud6a8\uc728) = 5263W<\/code><\/li>\n\n\n\n
                                  • \ucd5c\ub300 DC \uc804\ub958 = 5263W \/ 44V(\uc800\uc804\uc555) = 119.6A<\/code><\/li>\n<\/ul>\n<\/li>\n\n\n\n
                                  • \uc628\ub3c4 \uac10\uc18c:<\/strong>\u00a0\ud4e8\uc988\uac00 \uc81c\uc5b4\ub41c \uc2e4\ub0b4 \ud658\uacbd(25\u00b0C)\uc5d0 \uc788\uc73c\ubbc0\ub85c \uacbd\uac10\ud560 \ud544\uc694\uac00 \uc5c6\ub2e4\uace0 \uac00\uc815\ud569\ub2c8\ub2e4.<\/li>\n\n\n\n
                                  • \ucf54\ub4dc \uc2b9\uc218(NEC):<\/strong>\u00a0\uc774\uac83\uc740 \uc5f0\uc18d \ubd80\ud558\uc774\ubbc0\ub85c 1.25\ubc30 \uc2b9\uc218\ub97c \uc0ac\uc6a9\ud569\ub2c8\ub2e4.\n
                                      \n
                                    • \ucd5c\uc18c \uc694\uad6c \uc815\uaca9 = 119.6A \u00d7 1.25 = 149.5A<\/code><\/li>\n<\/ul>\n<\/li>\n\n\n\n
                                    • \ud45c\uc900 \ud4e8\uc988 \ud06c\uae30\ub97c \uc120\ud0dd\ud569\ub2c8\ub2e4:<\/strong>\u00a0\ub2e4\uc74c \ud45c\uc900 \ud06c\uae30\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.\u00a0150A<\/strong>.<\/li>\n\n\n\n
                                    • \ubcf4\ud638 \ud655\uc778:<\/strong>\n
                                        \n
                                      • \uc804\uc120 \ubcf4\ud638:<\/strong>\u00a0150A \ud4e8\uc988 \uc815\uaca9\uc740 2\/0 \uc640\uc774\uc5b4\uc758 190A \uc554\ud398\uc5b4 \uc6a9\ub7c9\ubcf4\ub2e4 \ub0ae\uc2b5\ub2c8\ub2e4. \u2713<\/li>\n\n\n\n
                                      • \uc7a5\ube44 \ubcf4\ud638:<\/strong>\u00a0150A \ud4e8\uc988\ub294 \ucd5c\ub300 125A\uc758 \uc5f0\uc18d \uc804\ub958\uc5d0 \ub9de\uac8c \uc124\uacc4\ub41c \uc778\ubc84\ud130\ub97c \ubcf4\ud638\ud569\ub2c8\ub2e4. \u2713<\/li>\n<\/ul>\n<\/li>\n\n\n\n
                                      • \ubc29\ud574 \ub4f1\uae09\uc744 \ud655\uc778\ud569\ub2c8\ub2e4:<\/strong>\u00a0\uc608\uc0c1 \uace0\uc7a5 \uc804\ub958\ub294 18kA\uc785\ub2c8\ub2e4. \uc774\ubcf4\ub2e4 \ub354 \ud070 \ucc28\ub2e8 \uc815\uaca9\uc758 \ud4e8\uc988\uac00 \ud544\uc694\ud569\ub2c8\ub2e4. \ud45c\uc900 ANL \ub610\ub294 MEGA \ud4e8\uc988\ub294 \uc815\uaca9\uc774 2~6kA\uc5d0 \ubd88\uacfc\ud55c \uacbd\uc6b0\uac00 \ub9ce\uc544 \ubd80\uc801\ud569\ud569\ub2c8\ub2e4. \ub2e4\uc74c\uacfc \uac19\uc740 \ub192\uc740 \ucc28\ub2e8 \uc6a9\ub7c9\uc758 \ud4e8\uc988\ub97c \uc0ac\uc6a9\ud574\uc57c \ud569\ub2c8\ub2e4.\u00a0\ud074\ub798\uc2a4 T \ud4e8\uc988<\/strong>. \ud074\ub798\uc2a4 T \ud4e8\uc988\uc758 \ucc28\ub2e8 \uc815\uaca9\uc740 20kA ~ 200kA\uc785\ub2c8\ub2e4. 20kA \uc815\uaca9 \ud074\ub798\uc2a4 T \ud4e8\uc988\uac00 \uc548\uc804\ud55c \uc120\ud0dd\uc785\ub2c8\ub2e4.<\/li>\n<\/ol>\n\n\n\n

                                        \ucd5c\uc885 \uc120\ud0dd:<\/strong> 150A, \ud074\ub798\uc2a4 T \ud4e8\uc988(\u226520kA \ucc28\ub2e8 \uc815\uaca9).<\/strong><\/p>\n\n\n\n

                                        C. DC \uace0\uc18d \ucda9\uc804\uae30(EVSE)<\/h3>\n\n\n\n

                                        DC \uace0\uc18d \ucda9\uc804\uae30\ub294 \uacfc\uc804\ub958\ub85c \uc778\ud574 \ub9c8\uc774\ud06c\ub85c\ucd08 \ub2e8\uc704\ub85c \ud30c\uad34\ub420 \uc218 \uc788\ub294 \ubbfc\uac10\ud55c \uc804\ub825 \uc804\uc790 \uc7a5\uce58(IGBT \ub610\ub294 SiC MOSFET)\uac00 \ud3ec\ud568\ub418\uc5b4 \uc788\ub2e4\ub294 \uc810\uc5d0\uc11c \ud2b9\ubcc4\ud569\ub2c8\ub2e4. \uc5ec\uae30\uc11c \ubcf4\ud638\ub294 \uc804\uc120 \ud654\uc7ac\ub97c \ubc29\uc9c0\ud558\ub294 \uac83\ubcf4\ub2e4\ub294 \uac12\ube44\uc2fc \ubc18\ub3c4\uccb4 \ubaa8\ub4c8\uc744 \uc808\uc57d\ud558\ub294 \ub370 \ub354 \ud070 \uc758\ubbf8\uac00 \uc788\uc2b5\ub2c8\ub2e4. \uc774\ub97c \uc704\ud574\uc11c\ub294 \ucd08\uace0\uc18d \ud4e8\uc988\uac00 \ud544\uc694\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n

                                        \uc2dc\ub098\ub9ac\uc624:<\/strong> 150kW DC \uace0\uc18d \ucda9\uc804\uae30\uc5d0\uc11c 50kW \uc804\ub825 \ubaa8\ub4c8 \ud558\ub098\uc5d0 \ub9de\ub294 DC \ucd9c\ub825 \ud4e8\uc988\uc758 \ud06c\uae30\ub97c \uc815\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n

                                          \n
                                        • \ubaa8\ub4c8 \uc804\ub825: 50kW<\/li>\n\n\n\n
                                        • DC \ucd9c\ub825 \uc804\uc555 \ubc94\uc704: 200-1000VDC<\/li>\n\n\n\n
                                        • IGBT \ubaa8\ub4c8 \ub0b4\uc804\uc555(I\u00b2t): 50,000A\u00b2s<\/li>\n\n\n\n
                                        • DC \ubc84\uc2a4\uc5d0\uc11c \uc608\uc0c1\ub418\ub294 \ub2e8\ub77d: 50kA<\/li>\n<\/ul>\n\n\n\n

                                          \uacc4\uc0b0:<\/strong><\/p>\n\n\n\n

                                            \n
                                          1. \ucd5c\ub300 \uc124\uacc4 \uc804\ub958:<\/strong>\u00a0\uc804\ub958\ub294 \uac00\uc7a5 \ub0ae\uc740 \uc804\uc555\uc5d0\uc11c \uac00\uc7a5 \ub192\uc2b5\ub2c8\ub2e4. \ucda9\uc804\uae30\uac00 \uc804\uc555 \ubc94\uc704\uc5d0\uc11c 50kW\ub97c \uacf5\uae09\ud560 \uc218 \uc788\ub2e4\uace0 \uac00\uc815\ud569\ub2c8\ub2e4:\n
                                              \n
                                            • \ucd5c\ub300 \uc804\ub958 = 50,000W \/ 200V = 250A<\/code><\/li>\n<\/ul>\n<\/li>\n\n\n\n
                                            • \uc628\ub3c4 \uac10\uc18c:<\/strong>\u00a0These modules are fan-cooled, but for reliability, we’ll use the manufacturer’s guidance, which typically suggests sizing the fuse rating at 1.2-1.5x the continuous load. We will use a 1.4x factor.<\/li>\n\n\n\n
                                            • \ucf54\ub4dc \uc2b9\uc218:<\/strong>\u00a0\uc81c\uc870\uc5c5\uccb4\uc5d0\uc11c \uc81c\uacf5\ud558\ub294 1.4\ubc30 \uc0ac\uc774\uc9d5 \uacc4\uc218\ub294 \ud544\uc694\ud55c \ubaa8\ub4e0 \uc548\uc804 \ub9c8\uc9c4\uc744 \uace0\ub824\ud55c \uac83\uc785\ub2c8\ub2e4.\n
                                                \n
                                              • \ubaa9\ud45c \ud4e8\uc988 \uc815\uaca9 = 250A \u00d7 1.4 = 350A<\/code><\/li>\n<\/ul>\n<\/li>\n\n\n\n
                                              • \ud45c\uc900 \ud4e8\uc988 \ud06c\uae30\ub97c \uc120\ud0dd\ud569\ub2c8\ub2e4:<\/strong>\u00a0A\u00a0350A<\/strong>\u00a0\ubc18\ub3c4\uccb4 \ud4e8\uc988\ub294 \ud45c\uc900 \ud06c\uae30\uc785\ub2c8\ub2e4.<\/li>\n\n\n\n
                                              • \ubcf4\ud638 \ud655\uc778:<\/strong>\u00a0Here, the most critical verification is the I\u00b2t (let-through energy) rating. The fuse’s total clearing I\u00b2t must be\u00a0\ub35c<\/em>\u00a0than the IGBT’s withstand rating.\n
                                                  \n
                                                • 350A, 1000VDC \ucd08\uace0\uc18d \ud4e8\uc988\uc758 \ub370\uc774\ud130\uc2dc\ud2b8\ub97c \ucc38\uc870\ud558\uba74 1000V\uc5d0\uc11c \ud074\ub9ac\uc5b4 I\u00b2t\uac00 ~38,000A\u00b2s\uc784\uc744 \uc54c \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n\n\n\n
                                                • 38,000A\u00b2 < 50,000A\u00b2<\/code>. \ud4e8\uc988\uac00 IGBT\ub97c \ubcf4\ud638\ud569\ub2c8\ub2e4. \u2713<\/li>\n<\/ul>\n<\/li>\n\n\n\n
                                                • \ubc29\ud574 \ub4f1\uae09\uc744 \ud655\uc778\ud569\ub2c8\ub2e4:<\/strong>\u00a0\uc0ac\uc6a9 \uac00\ub2a5\ud55c \uace0\uc7a5 \uc804\ub958\ub294 50kA\uc785\ub2c8\ub2e4. \uace0\uc18d \ubc18\ub3c4\uccb4 \ud4e8\uc988\ub294 \ucc28\ub2e8 \uc815\uaca9\uc774 50kA, 100kA \uc774\uc0c1\uc778 \ud4e8\uc988\ub97c \uc0ac\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub2e4\uc74c \uc911 \ud558\ub098\ub97c \uc120\ud0dd\ud574\uc57c \ud569\ub2c8\ub2e4.\u00a0\ucd5c\uc18c 50kA<\/strong>.<\/li>\n<\/ol>\n\n\n\n

                                                  \ucd5c\uc885 \uc120\ud0dd:<\/strong> 350A, 1000VDC aR \uc815\uaca9(\ubc18\ub3c4\uccb4) \ud4e8\uc988(\ucc28\ub2e8 \uc815\uaca9 50kA \uc774\uc0c1, I\u00b2t < 50,000A\u00b2s).<\/strong><\/p>\n\n\n\n

                                                  5\ubd80: \uc77c\ubc18\uc801\uc778 \ud568\uc815 \ubc0f \uc774\ub97c \ud53c\ud558\ub294 \ubc29\ubc95<\/h2>\n\n\n\n

                                                  Even with a solid process, common mistakes can compromise a system’s safety and reliability. Here is a summary of the most frequent errors and how to prevent them.<\/p>\n\n\n\n

                                                  \ud568\uc815<\/th>Why It’s Dangerous<\/th>\uc774\ub97c \ubc29\uc9c0\ud558\ub294 \ubc29\ubc95<\/th><\/tr>
                                                  DC \ud68c\ub85c\uc5d0\uc11c AC \uc815\uaca9 \ud4e8\uc988 \uc0ac\uc6a9<\/strong><\/td>AC \ud4e8\uc988\ub294 DC \uc544\ud06c\ub97c \uc18c\ud654\ud560 \uc218 \uc5c6\uc73c\ubbc0\ub85c \uc9c0\uc18d\uc801\uc778 \uc544\ud06c, \ud4e8\uc988 \ud30c\uc5f4 \ubc0f \ub192\uc740 \ud654\uc7ac \uc704\ud5d8\uc73c\ub85c \uc774\uc5b4\uc9c8 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/td>\ud56d\uc0c1 DC \uc804\uc555 \ubc0f \ucc28\ub2e8 \uc815\uaca9(\uc608: VDC, gPV, \ud074\ub798\uc2a4 T)\uc774 \uba85\uc2dc\uc801\uc73c\ub85c \ud45c\uc2dc\ub41c \ud4e8\uc988\ub97c \uc0ac\uc6a9\ud558\uc138\uc694.<\/td><\/tr>
                                                  \uc628\ub3c4 \uac10\uc18d \ubb34\uc2dc<\/strong><\/td>\ub728\uac70\uc6b4 \ud658\uacbd(\uc608: \uc625\uc0c1 \ucef4\ubc14\uc774\ub108 \ubc15\uc2a4)\uc758 \ud4e8\uc988\ub294 \uc804\ub958 \uc6a9\ub7c9\uc774 \uc904\uc5b4\ub4e4\uae30 \ub54c\ubb38\uc5d0 \uc774\ub97c \ubcf4\uc644\ud560 \uc218 \uc788\ub294 \ud06c\uae30\ub97c \uac16\ucd94\uc9c0 \uc54a\uc73c\uba74 \ud2b8\ub9bd\uc744 \uc77c\uc73c\ud0ac \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/td>Check the manufacturer’s datasheet for temperature derating curves and adjust your fuse selection accordingly.<\/td><\/tr>
                                                  \uc5b8\ub354\uc0ac\uc774\uc9d5 \ucc28\ub2e8 \uc815\uaca9(kA)<\/strong><\/td>If a fuse’s interrupting rating is lower than the available fault current, it can explode during a short circuit.<\/td>\ud2b9\ud788 \ubc30\ud130\ub9ac \ubc45\ud06c\uc758 \uacbd\uc6b0 \uc608\uc0c1\ub418\ub294 \ub2e8\ub77d \uc804\ub958\ub97c \uacc4\uc0b0\ud558\uac70\ub098 \ubcf4\uc218\uc801\uc73c\ub85c \ucd94\uc815\ud558\uace0 \uc774 \uac12\uc744 \ucd08\uacfc\ud558\ub294 \ud4e8\uc988\ub97c \uc120\ud0dd\ud569\ub2c8\ub2e4.<\/td><\/tr>
                                                  Exceeding the Module’s Max Fuse Rating<\/strong><\/td>Sizing a fuse above the solar panel’s maximum series fuse rating voids the warranty and eliminates protection for the panel itself.<\/td>Always verify your selected fuse rating against the equipment manufacturer’s specifications. Let the lower value dictate your maximum size.<\/td><\/tr>
                                                  \ud4e8\uc988 \ubc0f \uc804\uc120 \uac8c\uc774\uc9c0 \ubd88\uc77c\uce58<\/strong><\/td>Installing a fuse with a higher amperage rating than the wire it’s connected to. The wire can overheat and melt before the fuse blows.<\/td>\ud4e8\uc988 \uc815\uaca9\uc740 NEC 240.4\uc5d0 \ub530\ub77c \ud56d\uc0c1 \ubcf4\ud638\ud558\ub294 \ub3c4\uccb4\uc758 \uc554\ud398\uc5b4\ubcf4\ub2e4 \uc791\uac70\ub098 \uac19\uc544\uc57c \ud569\ub2c8\ub2e4.<\/td><\/tr>
                                                  \uc798\ubabb\ub41c \ud4e8\uc988 \uc18d\ub3c4 \uc0ac\uc6a9<\/strong><\/td>\ubbfc\uac10\ud55c \uc804\uc790\uae30\uae30\ub97c \ubcf4\ud638\ud558\uae30 \uc704\ud574 \ub290\ub9b0 \uc2dc\uac04 \uc9c0\uc5f0 \ud4e8\uc988\ub97c \uc0ac\uc6a9\ud558\uac70\ub098 \ub3cc\uc785 \uc804\ub958\uac00 \ub192\uc740 \ubaa8\ud130 \ud68c\ub85c\uc5d0 \ube60\ub974\uac8c \uc791\ub3d9\ud558\ub294 \ud4e8\uc988\ub97c \uc0ac\uc6a9\ud569\ub2c8\ub2e4.<\/td>Match the fuse’s time-current curve to the application: gPV for solar, aR for semiconductors, time-delay for motors, etc.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

                                                  \uacb0\ub860 \ubc0f \ud589\ub3d9 \uc720\ub3c4<\/h2>\n\n\n\n

                                                  \uc815\ud655\ud55c DC \ud4e8\uc988 \uc0ac\uc774\uc9d5\uc740 \ud558\ub098\uc758 \uc22b\uc790\uac00 \uc544\ub2c8\ub77c \uc2dc\uc2a4\ud15c\uc785\ub2c8\ub2e4. \uc774\ub294 \ucf54\ub4dc \uc694\uad6c \uc0ac\ud56d, \ud658\uacbd \ud604\uc2e4, \ub3c4\uccb4\uc5d0\uc11c \uc804\uc6d0 \uc790\uccb4\uc5d0 \uc774\ub974\uae30\uae4c\uc9c0 \uccb4\uc778 \ub0b4 \uac01 \uad6c\uc131 \uc694\uc18c\uc758 \ud2b9\uc815 \ubcf4\ud638 \uc694\uad6c \uc0ac\ud56d\uc758 \uade0\ud615\uc744 \ub9de\ucd94\ub294 \uccb4\uacc4\uc801\uc778 \ud504\ub85c\uc138\uc2a4\uc785\ub2c8\ub2e4. \ud0dc\uc591\uad11\uc758 1.56\ubc30 \uc2b9\uc218\ubd80\ud130 \ubc30\ud130\ub9ac\uc758 \uc911\uc694\ud55c \ucc28\ub2e8 \uc6a9\ub7c9, EV \ucda9\uc804\uae30\uc5d0 \ud544\uc694\ud55c \ub9c8\uc774\ud06c\ub85c\ucd08 \ub2e8\uc704\uc758 \uc751\ub2f5 \uc2dc\uac04\uae4c\uc9c0, \uc774\ub97c \uc81c\ub300\ub85c \ud30c\uc545\ud558\ub294 \uac83\uc774 \uc9c4\uc815\ud55c \uc804\uae30 \uc804\ubb38\uac00\uc758 \ud2b9\uc9d5\uc785\ub2c8\ub2e4. \uc774\ub294 \ub2e8\uc21c\ud788 \uc124\uce58\ub9cc \ud558\ub294 \uc2dc\uc2a4\ud15c\uacfc \uc218\uc2ed \ub144 \ub3d9\uc548 \uc548\uc804\ud558\uace0 \uc548\uc815\uc801\uc778 \uc131\ub2a5\uc744 \ubc1c\ud718\ud558\ub3c4\ub85d \uc124\uacc4\ub41c \uc2dc\uc2a4\ud15c\uc758 \ucc28\uc774\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n

                                                  \uc2e0\ub8b0\ud560 \uc218 \uc788\ub294 \uad6c\uc131 \uc694\uc18c\ub85c \uc774\ub7ec\ud55c \uc6d0\uce59\uc744 \uad6c\ud604\ud560 \uc900\ube44\uac00 \ub418\uc168\ub098\uc694? Explore Kuangya’s full range of NEC and IEC-compliant DC fuses<\/strong> \ub97c \ud1b5\ud574 \ud504\ub85c\uc81d\ud2b8\uc5d0 \ud544\uc694\ud55c \uc815\ud655\ud55c \ubcf4\ud638 \uae30\ub2a5\uc744 \ucc3e\uc744 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ubcf5\uc7a1\ud55c \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \ub610\ub294 \uacc4\uc0b0\uc744 \uac80\uc99d\ud558\ub294 \ub370 \uc801\ud569\ud569\ub2c8\ub2e4, \uc5d4\uc9c0\ub2c8\uc5b4\ub9c1 \ud300\uc5d0 \ubb38\uc758<\/strong> \ub97c \ud1b5\ud574 \ub2e4\uc74c \ud504\ub85c\uc81d\ud2b8\uc5d0 \ub300\ud55c \uc804\ubb38\uac00\uc758 \uc548\ub0b4\ub97c \ubc1b\uc73c\uc138\uc694.<\/p>\n\n\n\n

                                                  \n\n\n\n

                                                  Disclaimer: The information provided in this article is for educational purposes only. Electrical work is dangerous and should only be performed by qualified professionals. Always consult the latest version of the National Electrical Code (NEC), relevant IEC standards, local codes enforced by the Authority Having Jurisdiction (AHJ), and equipment manufacturer’s specifications before designing or installing any electrical system.<\/em><\/p>","protected":false},"excerpt":{"rendered":"

                                                  Introduction: The High Cost of a ‘Close Enough’ Calculation An experienced solar installer, let’s call him Dave, was facing a recurring nightmare. On a 100kW commercial rooftop system he\u2019d completed three months prior, fuses were blowing on perfectly sunny days. The client was losing production, and Dave\u2019s team was wasting time and money on service […]<\/p>\n","protected":false},"author":4,"featured_media":2359,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[45],"tags":[],"class_list":["post-2358","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dc-protection-safety"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/cnkuangya.com\/ko\/wp-json\/wp\/v2\/posts\/2358","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cnkuangya.com\/ko\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cnkuangya.com\/ko\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cnkuangya.com\/ko\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/cnkuangya.com\/ko\/wp-json\/wp\/v2\/comments?post=2358"}],"version-history":[{"count":1,"href":"https:\/\/cnkuangya.com\/ko\/wp-json\/wp\/v2\/posts\/2358\/revisions"}],"predecessor-version":[{"id":2362,"href":"https:\/\/cnkuangya.com\/ko\/wp-json\/wp\/v2\/posts\/2358\/revisions\/2362"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cnkuangya.com\/ko\/wp-json\/wp\/v2\/media\/2359"}],"wp:attachment":[{"href":"https:\/\/cnkuangya.com\/ko\/wp-json\/wp\/v2\/media?parent=2358"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cnkuangya.com\/ko\/wp-json\/wp\/v2\/categories?post=2358"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cnkuangya.com\/ko\/wp-json\/wp\/v2\/tags?post=2358"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}