Subpanel wiring - disconnect near main panel

Electrical · Distribution Panels · printed page 97 (PDF page 98)

Book index entries

Subpanel – Wiring Disconnect by Main Panel Distribution Panels – Electrical Electric Distribution Panels Electric Subpanel Wiring Subpanel – Wiring Electrical

Text in the illustration

this is a better arrangement - the feed wire is protected against both overload and short circuit
8 gauge copper feed wire
subpanel
to ground
main breaker
service conductors
off
on
40-amp breaker
nail driven into wire causes short circuit, which will trip the 40-amp breaker before the feed wire overheats
8 gauge copper feed wire connected directly to main panel bus bars
neutral bus bar
bus bars
grounding terminal

Generated explanation

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 the nearby breaker before continuing to the subpanel. The main panel includes a main breaker, service conductors, branch circuit breakers, bus bars, a neutral bus bar, and a grounding terminal. A nail penetrating the feeder illustrates a short circuit that trips the 40-amp breaker before the feeder overheats. The annotation identifies this as a better arrangement because the feeder is protected against both overload and short circuit.

Related illustrations

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Subpanel wiring - disconnect near subpanel

· p. 97

The illustration shows a main distribution panel feeding a subpanel through an 8 gauge copper feed wire connected directly to the main panel bus bars. A separate 40-amp breaker is located beside the subpanel, at the rece

0571

Subpanel wiring - no separate disconnect switch

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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