Find answers to the most common questions about electrical wiring & components.
Tighten metal box screws or use retrofit brackets (like Arlington FSBs) that clip onto drywall. For plaster walls, add wooden shims behind the box.
Check NEC fill capacity—typically 4-6 THHN wires (max 40% conduit fill).
Use plastic boxes for lightweight fixtures (switches/outlets) and metal boxes for heavy fixtures (ceiling fans). Match the box depth to wall thickness (e.g., 2.5" for drywall).
EMT (thin-wall metal): Lightweight, bendable, indoor use. PVC: Weatherproof, ideal for underground/wet locations. Rigid (GRC): Heavy-duty, requires threading for connections.
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