Quick Hits

Episode 3: Relocatable Structures, Power Supply & Disconnects (545.20 – 545.24)

SLIDE 1 (HOOK / COVER)

⚡ NEC Quick Hit: Relocatable Structures (Part 3) ⚡

Temporary commercial trailers, industrial relocatable units, and feeder requirements—let's review Part II of Article 545 (Sections 545.20 through 545.24)! 👇

SLIDE 2 (POWER SUPPLY & MULTIPLE STRUCTURES)

Feeders and Panelboards:

• Feeder Requirements: Relocatable structures must be supplied by a feeder containing insulated, color-coded conductors, including an equipment grounding conductor (which can be uninsulated if part of a listed cable assembly).

• Connected Structures: Where multiple relocatable structures are structurally connected to form a single unit with a factory-installed panelboard in each, each panelboard can be supplied by a separate feeder.

• Industrial Identification: Identification rules in Section 225.37 are relaxed for connected structures on commercial/industrial sites maintained by qualified personnel, provided panelboards are clearly marked with their supply disconnect location.

SLIDE 3 (DISCONNECTING MEANS & OCPDS)

Readily Accessible Controls:

• Single Disconnect: A single disconnecting means (circuit breaker or switch/fuses) must be provided in a readily accessible location for each relocatable structure.

• Distribution Equipment: Branch-circuit distribution equipment and OCPDs must be installed inside each relocatable structure with panelboards located in a readily accessible spot.

SLIDE 4 (WRAP-UP)

💡 Apprentice Pro-Tip: Always verify that every relocatable structure features a clearly marked, readily accessible main disconnect so power can be cut instantly in an emergency!

💬 Save this post for your next industrial relocatable trailer hookup!

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