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What's Wrong Here?

Feb 1, 2003 12:00 PM, By Joe Tedesco

As per the requirements of 230.24(B), Vertical Clearance from Ground, “Service-drop conductors, where not in excess of 600V, nominal, must have the following minimum clearance from final grade: (1) 3.0 m (10 ft) — at the electric service entrance to buildings, also at the lowest point of the drip loop of the building electric entrance, and above areas or sidewalks accessible only to pedestrians, measured from final grade or other accessible surface only for service-drop cables supported on and cabled together with a grounded bare messenger where the voltage does not exceed 150V to ground.”

As per 250.52 in the 2002 NEC, metal underground gas piping systems and aluminum electrodes shall not be used as grounding electrodes.

This installation violates the rules of Part IV, Luminaire (Fixture) Supports of Article 410, Luminaires (Lighting Fixtures), Lampholders, and Lamps of the 2002 NEC. More specifically, the requirements of 410.15(B) state that metal poles can be used to support luminaires (lighting fixtures) and serve as a raceway to enclose supply conductors, provided that the metal pole has a handhole not less than 50 mm × 100 mm (2 in. × 4 in.) and is equipped with a raintight cover to provide access to the supply terminations within the pole or pole base.

According to the requirements of 440.63, an attachment plug and receptacle is permitted to serve as the disconnecting means for a single-phase room air conditioner rated 250V or less if (1) the manual controls on the room air conditioner are readily accessible and located within 1.8 m (6 ft) of the floor or (2) an approved manually operable switch is installed in a readily accessible location within sight from the room air conditioner.

110.27(B). In locations where electric equipment is likely to be exposed to physical damage, enclosures or guards are required to be so arranged and of such strength as to prevent such damage. See also, 300.10 where metal raceways for conductors are required to be metallically joined together into a continuous electric conductor and shall be connected to all boxes, fittings, and cabinets so as to provide effective electrical continuity.

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