What are typical copper service entrance wire/cable sizes for the electrical service to a house?.What is the fireman’s switch emergency disconnect requirement for residential electrical service?.Why is a leaning electrical service mast dangerous?.What is the minimum overhead electric service drop height/clearance to a house?.Here’s links with answers to some Frequently Asked Questions (FAQ) about ELECTRICAL SERVICE: Go to our articles What is a service conductor?and What is a feeder conductor? for the difference between the two. These sizes for service conductors also apply to feeder conductors. Electricians and experienced inspectors can tell at a glance if the service cable size is correct most of the time.įor sizes of aluminum service entrance cables, see our blog post What are typical aluminum service entrance wire/cable sizes for the electrical service to a house? But not all cables are clearly marked and sometimes the lettering strip is just not visible. Wire size may be marked on the side of the cable, followed by the letters “AWG”. The correct sizing of the neutral depends on doing a calculation of the “unbalanced load,” which is an estimate of the amount of 120-volt current usage. The neutral wire is often one or two sizes smaller than the two hots. An often-used rule-of-thumb is to jump up one wire size for each 100 feet of a long run. Wire sizes are AWG (American Wire Gauge), and adjustments may be necessary due to temperature rating or length of wire run. Here’s a listing of the standard copper service entrance wire sizes for residential 3-wire single-phase service.
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