Subpanel wiring - no separate disconnect switch

Electrical · Distribution Panels · printed page 96 (PDF page 97)

Book index entries

Subpanel – Wiring No Separate Disconnect Switch Distribution Panels – Electrical Electric Distribution Panels Electric Subpanel Wiring Subpanel – Wiring Electrical

Text in the illustration

a very poor arrangement - the feed wire is not protected against overload or short circuit
60 amp subpanel
to ground
main breaker
service conductors
8 gauge copper feed wire connected directly to main panel bus bars
nail driven into wire causes short circuit (no 40 amp breaker to protect 8 gauge wire)
neutral bus bar
bus bars
grounding terminal

Generated explanation

The illustration shows a main electrical distribution panel supplying a 60 amp subpanel through an 8 gauge copper feeder. The feeder is connected directly to the main panel bus bars rather than through a dedicated feeder circuit breaker. A nail penetrating the feeder is shown causing a short circuit, with sparks at the damaged cable. The annotations identify the absence of a 40 amp breaker to protect the feeder against overload or short circuit. The main panel also shows its main breaker, service conductors, neutral bus bar, grounding terminal, and connection to ground.

Related illustrations

0573

Subpanel wiring - disconnect near main panel

· p. 97

The illustration shows a main electrical panel supplying a subpanel through a separate 40-amp breaker located near the main panel. An 8 gauge copper feeder connects directly to the main panel bus bars and passes through