Standard dimensions of a Class I wall-mounted distribution box
These are the standard-sized boxes used for mounting single electrical devices such as light switches or outlets in US homes. Their approximate dimensions are 4 inches tall by 2 inches wide, with depths commonly ranging from 1-1/2″ to 3-1/2″. Typical wall-mount enclosure sizes often range from about 200 × 200 × 120 mm up to 800 × 600 × 300 mm. It is the latest in a series of documents giving the requirements for dition in every respect.
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