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NEC Article 300 — General Requirements for Wiring Methods

Updated Mar 26, 2026
Conductor installation: protection, routing, securing, firestopping, environmental requirements.

NEC Article 300: 300.4 protection against physical damage: cables/raceways within 1.25in of framing face need steel plates. Bored holes: min 1.25in from face (or steel plate). 300.5 underground installations (Table 300.5): direct burial UF cable 24in, rigid conduit 6in, PVC conduit 18in under driveways. 300.7 raceways exposed to different temperatures: seal to prevent condensation migration. 300.11 securing and supporting: independent support for raceways (not hung from other raceways or ceiling grid). 300.14 min 6in free conductor at boxes. 300.15 boxes/conduit bodies required at splices, junctions, switches, receptacles. 300.21 fire-rated assemblies: wiring penetrations firestopped per building code.

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NECwiring-methodsroutingfirestoppingundergroundprotection
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code year
2023
code system
NEC
code section
Article 300
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