I have a situation where an electrician made a field change that is out of the ordinary for me. The arrangement is a Step-down 480v transformer feeding a single phase 240v panel (Panel A for reference).
The issue is that he did not run an SSBJ or any type of ground at all between the transformer. The transformer is located inside the building.
After reviewing Section 250.30 (Specifically Exhibit 250.14 & 250.15 in the NEC 2014 Handbook) it would appear that an SSBJ is needed in both cases. It doesent appear as though any listed exception applies to the installation as described above.
Thank You all.
The issue is that he did not run an SSBJ or any type of ground at all between the transformer. The transformer is located inside the building.
- The Main within Panel "A" is the disconnect for the transformer.
- The GEC is located at the step-down transformer
- The only conductors that run between the transformer and panel are the (2) phase conductors and the neutral.
- He installed a bonding screw within panel "A".
After reviewing Section 250.30 (Specifically Exhibit 250.14 & 250.15 in the NEC 2014 Handbook) it would appear that an SSBJ is needed in both cases. It doesent appear as though any listed exception applies to the installation as described above.
Thank You all.