In accordance with 46 CFR, Subchapter J (Electrical Engineering), panel boards are required to be numbered and have a circuit directory. What information is required for each circuit in the directory?
• 46 CFR Subchapter J – Electrical Engineering requirements for panelboards and circuit directories • Meaning of circuit designation, load description, and over current device rating or setting • Purpose of a circuit directory for operation, maintenance, and safety
• Ask yourself: If you were troubleshooting or isolating a fault, which specific pieces of information in the directory would you need to quickly and safely identify and secure a circuit? • Consider whether regulations usually require minimal information or a complete picture for each circuit on safety‑critical equipment like shipboard electrical panels. • Compare each answer choice: which one(s) would leave an electrician unsure about what the circuit feeds or how it is protected?
• Verify in 46 CFR Subchapter J what is explicitly listed as required for each circuit in a panelboard directory. • Check whether both the identification of the circuit (its number/name) and the nature of the load (what it feeds) are mentioned. • Confirm whether the regulation also requires including the over current device rating or setting for each circuit, not just for the panel as a whole.
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