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Class I, Division 2 지역에서 차단기 및 스위치 설치(Circuit Breaker and Switch Installation Requirements in Class I, Division 2 Areas), NEC 위험 지역 분류(구분) 관련 규정(법령, 법규, 기준, 규칙, 법, 근거, CODE, 코드)
🔹 NEC ARTICLE 501 — CLASS I LOCATIONS 501.115 Switches, Circuit Breakers, Motor Controllers, and Fuses. (B) Class I, Division 2. Switches, circuit breakers, motor controllers, and fuses in Class I, Division 2 locations shall comply with 501.115(B)(1) through (B)(4). 🔹 Class I, Division 2 위치에서 스위치, 차단기, 모터 컨트롤러, 퓨즈의 규정 (NEC 501.115(B)) (B) Class I, Division 2Class I, Division 2 지역에 설치되는 스위치, 차단..
2025. 3. 22.
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.
