NEC User
Senior Member
- Location
- Marlboro, NJ, USA
Table 450.3(B) indicates that there are two (2) methods for Protection: 1) Primary only protection and 2)Primary and Secondary Protection.
When are we required to provide secondary protection?
Do we need secondary protection if we have a current of 9 amperes or more and the primary protection circuit breaker is sized within 125% of the transformer-rated current?
When are we required to provide secondary protection?
Do we need secondary protection if we have a current of 9 amperes or more and the primary protection circuit breaker is sized within 125% of the transformer-rated current?