I heard someone refer to the line and load terminals of a CB as primary side and secondary side?
Is this common terminology?

Redsy
Don't know if it is common or not, but I have used that terminology when discussing lines and loads with Lead Engineers and some contractors.

Redsy:

The UL Directory "White Book" includes the following statement under the heading of "LINE - LOAD CONNECTIONS"

"Line and load markings on a circuit breaker are intended to limit connections thereto as marked."

Watch out four for backfed installations, if you need more information from the "White Book" let me know.

[This message has been edited by Joe Tedesco (edited 03-13-2002).]

Never heard of it relative to breakers. Always hear it relative to transformers.

Regards,
Doc