The National Electric Code (NEC) requires a way for disconnecting the electrical service where it enters a building. This main circuit breaker prevents the building from demanding too much current from the utility creating a dangerous conditions. This circuit breaker may be in a separate panel or part of a service entrance rated transfer switch.
Non-Service Entrance Rated
There isn’t any over-current protection within a non-service entrance rated transfer switch. Therefore, when you install this type of transfer switch, it will be after the service disconnect panel.
If you find a non-fusible manual transfer switch, it does not have over-current protection. Non-fusible switches are not service entrance rated and cannot have the over-current protection added.
Service Entrance Rated
Service entrance switches will have a service disconnect at the utility side. This installation requires less components, making it ideal for new construction, which can be more cost effective.
At WINCO, we offer ASCO service entrance rated switches equipped with an additional disconnect breaker.