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변압기 1차측/2차측 과전류 보호 기준(Transformer Overcurrent Protection Standards), 차단기 용량(암페어, A) 산정(선정) 규정(법령, 법규, 기준, 규칙, 법, 근거, CODE, 코드)
🔹 NEC (미국) ARTICLE 450 — TRANSFORMERS AND TRANSFORMER VAULTS (INCLUDING SECONDARY TIES) 450.3 Overcurrent Protection. Overcurrent protection of transformers shall comply with 450.3(A), (B), or (C). As used in this section, the word transformer shall mean a transformer or polyphase bank of two or more single-phase transformers operating as a unit. 📌 450.3 과전류 보호(Overcurrent Protection) 규정 해석 ..
2025. 3. 22.
방수 플렉시블 전선관(Liquidtight Flexible Metal Conduit, LFMC) 관련 규정(법령, 법규, 기준, 규칙, 법, 근거, CODE, 코드)
50.2 Definition. Liquidtight Flexible Metal Conduit (LFMC). A raceway of circular cross section having an outer liquidtight, nonmetallic, sunlight-resistant jacket over an inner flexible metal core with associated couplings, connectors, and fittings for the installation of electric conductors. 📌 NEC 350.2 - 정의 (Definition)💡 액체 차단 유연 금속 전선관 (Liquidtight Flexible Metal Conduit, LFMC)LFMC는 원형 단면..
2025. 3. 17.
금속제 가요전선관, 플렉시블 금속 전선관(Flexible Metal Conduit, FMC) 관련 규정(법령, 법규, 기준, 규칙, 법, 근거, CODE, 코드)
NEC 348.2 Definition. Flexible Metal Conduit (FMC). A raceway of circular cross section made of helically wound, formed, interlocked metal strip. 📌 NEC 348.2 - 정의 (Definition)📖 유연 금속 전선관(FMC, Flexible Metal Conduit)나선형(스프링처럼 감긴)으로 만들어지고, 금속 띠를 서로 맞물리게(인터록) 형성한 원형 단면의 전선관을 말해. 348.10 Uses Permitted. FMC shall be permitted to be used in exposed and concealed locations. 📌 NEC 348.10 - 사용 가능 장소..
2025. 3. 17.
HDPE 전선관(High Density Polyethylene Conduit) 관련 규정(법령, 법규, 기준, 규칙, 법, 근거, CODE, 코드)
NEC 353.2 Definition.High Density Polyethylene (HDPE) Conduit. A nonmetallic raceway of circular cross section, with associated couplings, connectors, and fittings for the installation of electrical conductors. 📌 NEC 353.2 - 정의 (Definition)🔹 고밀도 폴리에틸렌(HDPE) 전선관(Conduit)👉 원형 단면을 가진 비금속(nonmetallic) 전선관으로,👉 전선 설치를 위한 **커플링(couplings), 커넥터(connectors), 및 피팅(fittings)**이 포함됨.🔎 쉽게 설명하면?HDPE 전선관..
2025. 3. 17.
