Reference boundary

Panel label reference only. It does not approve tandem breakers, circuit count, panel loading, or breaker compatibility.

Reference table

Decode common loadcentre spaces/circuits labels such as 30/60 or 40/80.

Reference basis summarizes common manufacturer spaces/circuits panel labels; panel directory and breaker markings govern field use.
Panel labelSpacesMax circuits labelLabel meaningBoundary
12/24122412 full-size spaces and up to 24 labelled circuits where product markings permitlabel reference only; tandem breaker use depends on panel and breaker markings
24/48244824 full-size spaces and up to 48 labelled circuits where product markings permitlabel reference only; tandem breaker use depends on panel and breaker markings
30/60306030 full-size spaces and up to 60 labelled circuits where product markings permitlabel reference only; tandem breaker use depends on panel and breaker markings
40/80408040 full-size spaces and up to 80 labelled circuits where product markings permitlabel reference only; tandem breaker use depends on panel and breaker markings
42/84428442 full-size spaces and up to 84 labelled circuits where product markings permitlabel reference only; tandem breaker use depends on panel and breaker markings
Use notes
  • Use this table for preliminary reference and arithmetic checks only.
  • Confirm equipment ratings, product markings, installation conditions, utility requirements, and the local authority requirements before design or field use.