Determining service size by the service entrance wires

Electrical · Service Boxes · printed page 89 (PDF page 90)

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Book index entries

Electric Service – Determining by Service Entrance Wires Electric Service – Size Service Size

Text in the illustration

check the size of the service entrance conductors at the masthead or inside the service box
service entrance conductors
service mast
drip loop
to ground
main breaker
neutral bus bar
bus bars
grounding terminal

Generated explanation

The illustration shows two locations for checking service entrance conductor size to help determine electrical service capacity: at the masthead and inside the service box. The exterior detail shows conductors emerging from a weatherhead on a service mast, forming drip loops, and connecting to overhead service wires. The interior detail shows service entrance conductors entering a breaker panel and connecting at the main breaker. Branch circuit breakers, bus bars, a neutral bus bar, a grounding terminal, and a conductor leading to ground are also identified. Dashed circles highlight the service entrance conductors at both inspection locations; no defect is depicted.

Components

service entrance conductors service mast weatherhead overhead service wires drip loops service box main breaker branch circuit breakers neutral bus bar bus bars grounding terminal grounding conductor

Materials

metal enclosure metal conduit electrical conductor insulation metal conductors

Related illustrations

0531

Determining service size by the main disconnect

· p. 89

The illustration shows two ways to determine electrical service size by checking the amperage rating of the main disconnect. On the left, a combination panel contains a main breaker above two columns of branch-circuit br