Reviewing a typical protective device trip curve (click here to see Fig. 2), it can be divided into three regions. First is the “instantaneous region,” which is the region intended to interrupt ...

Q: We are selling our house, and the new buyers had a home inspector check it out. One of the items he found was in the main electrical panel. He said there are two wires attached to one breaker and ...

You may have experienced a short circuit on a 15A to 100A branch circuit that also tripped the main breaker in that same panelboard, resulting in widespread downtime. This short circuit may have ...