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📱 EPISODE 4 — Article 245 (Part 4)
📱 EPISODE 4 — Article 245 (Part 4)
Distribution Cutouts & Oil-Filled Cutouts
SLIDE 1 — Distribution Cutouts: Installation & Operation
📍 EXPULSION-TYPE CUTOUTS (245.21(C))
Installation basics: cutouts must be accessible for operating/re-fusing, and positioned so fuse exhaust doesn't endanger anyone. 🚫 Not permitted indoors, underground, or in metal enclosures.
If the cutout ISN'T rated to interrupt load manually while carrying it, you need:
✅ An approved means to interrupt the load first (unless documented switching procedures + load-removal tools are used by qualified personnel)
✅ A conspicuous "not for load-break operation" sign
✅ Locked or restricted access for unqualified persons
SLIDE 2 — Cutout Ratings & Height
📊 CUTOUT RATING RULES
🔹 Interrupting rating ≥ available fault current
🔹 Max voltage rating ≥ max circuit voltage
🔹 Nameplate/ID needed on body, door, or fuse tube: manufacturer type, current rating, voltage rating, interrupting rating
🔹 Fuse links: permanent markings for current rating and type
📏 Outdoor structure-mounted cutouts need proper clearance between lowest energized parts and standing surfaces per 110.34(E) — and that clearance has to hold in BOTH open and closed positions.
SLIDE 3 — Oil-Filled Cutouts
🛢️ OIL-FILLED CUTOUTS (245.21(D))
Similar rating structure to dry cutouts, PLUS:
✅ Continuous current rating ≥ max continuous current
✅ Interrupting rating ≥ available fault current
✅ Max voltage rating ≥ max circuit voltage
✅ Fault CLOSING rating ≥ max asymmetrical fault current — unless interlocks/procedures prevent closing into a fault
✅ Nameplate showing continuous current, max voltage, interrupting current
✅ Fuse links marked with current rating & type
📍 Location: top of cutout can't be more than 5 ft (1.5m) above the floor/platform, and suitable barriers/enclosures must prevent contact with nonshielded cables or energized parts.
SLIDE 4 — Exam Question + CTA
🧠 TEST YOURSELF
Q: Per 245.21(D)(7), the top of an oil-filled cutout cannot be mounted more than how far above the floor or platform?
A) 3 ft
B) 5 ft
C) 6.5 ft
D) 8 ft
(Comment your answer 👇)
FOLLOW — next episode covers load interrupter switches ⚡ #JoshTheSparky #NEC2026 #ElectricianLife
⚠️ Educational NoticeQuick Hits are educational explanations based on my understanding of the NEC. Always verify requirements in the current adopted NEC, applicable local amendments, manufacturer instructions, and with the AHJ.
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