If I have an adjustable trip 480 3 phase breaker with an engineered calculated load and qualified maintenance personnel. Can I size my cable to the adjusted trip setting or does it have to be sized for the full rating of the breaker.
example 1
400 amp CB rated 80%
320 amp trip adjustment
400 Kcmil cu 75c in conduit
example 2
400 amp CB rated 100%
320 amp trip adjustment
400 Kcmil cu 75c in conduit
Or do I need to pull 500's?
Thanks in advance for you expertise.
example 1
400 amp CB rated 80%
320 amp trip adjustment
400 Kcmil cu 75c in conduit
example 2
400 amp CB rated 100%
320 amp trip adjustment
400 Kcmil cu 75c in conduit
Or do I need to pull 500's?
Thanks in advance for you expertise.