NEC 408.4 / NFPA 70E 205.2
What it means on the job
A single-line diagram showing the electrical distribution system must be available to workers for safe operation and troubleshooting. Without it, workers cannot identify all energy sources, which is essential for lockout/tagout procedures.
Tested in 1 CraftIQ puzzle
- whats-wrongUnion Hall Training: Motor Control Center Troubleshooting
Related NEC sections
NEC 400.8
Window AC units must be plugged directly into a wall outlet, never an extension cord. Extension cords cause voltage drop, overheating, and are a fire hazard with high-amperage equipment.
NEC 406.12(1)
All 125-volt, 15- and 20-ampere receptacles in dwelling-unit bathrooms must be listed tamper-resistant. A standard (non-TR) receptacle is a violation. (Note: a 15A receptacle is itself permitted on a 20A circuit serving two or more receptacles per Table 210.21(B)(3) — the defect here is the missing tamper-resistant listing, not the amperage.)
NEC 406.9(C)
Receptacles are not permitted within or directly over the bathtub or shower space (within 3 ft horizontally and 8 ft vertically of the threshold).
NEC 408.4(A)
Every panelboard must have a legible circuit directory identifying each circuit. On a commercial TI project, unlabeled panels are an immediate inspection failure and create a safety hazard for other floor tenants and maintenance personnel.
NEC 430.1 / NFPA 90A / high-rise office Electrical Plans
Motorized dampers and motorized shades shown on the high-rise office electrical plans must be connected to the appropriate branch circuits with proper control wiring. Unconnected motorized dampers can prevent proper smoke control in a high-rise fire event, creating a life-safety hazard.
NEC 430.102(B)
A disconnecting means must be located within sight of the motor it controls so a technician can lock it out for service. None is provided here.
CraftIQ explanations are original educational commentary written in trade language and verified against the cited standards. Always confirm requirements against the code edition adopted by your jurisdiction — this is training material, not a substitute for the code book or your AHJ.