CardsRule8086
Member
- Location
- Louisville, KY, USA
I have encountered an existing installation that has an outdoor pole mounted transformer (240/120V secondary - not a service) that feeds several overcurrent protective devices located in separate locations (see attached sketch). There isn't an overcurrent protective device located directly at the transformer secondary. The secondary conductors are over 25 feet long. NEC 240.21(C)(4) appears to be the closest tap rule for this installation. However, the installation does not comply with 240.21(C)(4)(2) since the conductors terminate at several sets of fuses rather than a single set of fuses. This installation does not appear to be compliant with the NEC and a fusible disconnect needs to be added near the transformer secondary that would limit the current to the ampacity of the overhead conductors. Is there another NEC section that I am overlooking that would allow this type of existing installation? If so, how would the transformer secondary conductors be sized?
