- Q.Can a 100-amp service panel
be used with a 60-amp incoming service?
responds: The answer is a conditional "Yes."
The service rating for a panel comprises the amp
rating of both the incoming feed conductor and the
overcurrent device. Typically, overcurrent
protection is provided by the service
panel’s main breaker or a fused switch. A
service panel main breaker rated at 100 amps would
trip only after the service load exceeded 100 amps.
Since this is well above the 60-amp capacity of the
service wire, the incoming service cable would not
be properly protected.
However, if you install a 100-amp main lug
panel and outfit it with 60-amp main breaker,
the 60-amp source conductor will be properly
protected. It is also important to install a
retainer clip to prevent the 60-amp breaker from
accidentally becoming dislodged.
Eric Lewis owns and operates
Spectrum Electrical Services in Montrose,