jeremysterling
Senior Member
- Location
- Austin, TX
This is a picture of a 15KVA 240V to 240/120V "isolation" transformer that I installed in the attic of a single family dwelling as part of a remodel. (Yes, me and an apprentice lifted this 170 lb. XFMR through the attic access). The plan is for primary and secondary ungrounded conductors to be #6. My feeders will be on 60A bkr. My secondary grounded conductor will be a #4 (HO's preference).
The service is approx 80' away. I'm using 1" smurf and FMC to the existing main panel and new sub-panel (approx 30' away.)
In the existing main panel, I see the existing cold water GEC (looks like bare #6).
Do I need to install a bare #6 terminated with the GC at the neutral taps on the secondary of the XFMR, run outside of the feeder conduit, and crimp it with like a c-hypress on to the existing cold water GEC (versus landing it on the neutral bar) in the existing main panel? Would this be the best and easiest way to bond the new SDS GC?
Would a green#10 be OK for the EGC ran in the feeder and secondary conduits?
If I'm bonding the GC at the XFMR, the neutral bar in the sub-panel should not be bonded to the sub-panel at the sub-panel?
I am also concerned the HO will see the green #10 to the EGC bar and think he's not "well grounded." I think I may install as large of EGC that will fit with my other secondary conductors, perhaps a #8 or even #6 (which may overfill my 1" smurf). Would you do the same?
I hope this is detailed enough to paint an accurate description of the install.
The service is approx 80' away. I'm using 1" smurf and FMC to the existing main panel and new sub-panel (approx 30' away.)
In the existing main panel, I see the existing cold water GEC (looks like bare #6).
Do I need to install a bare #6 terminated with the GC at the neutral taps on the secondary of the XFMR, run outside of the feeder conduit, and crimp it with like a c-hypress on to the existing cold water GEC (versus landing it on the neutral bar) in the existing main panel? Would this be the best and easiest way to bond the new SDS GC?
Would a green#10 be OK for the EGC ran in the feeder and secondary conduits?
If I'm bonding the GC at the XFMR, the neutral bar in the sub-panel should not be bonded to the sub-panel at the sub-panel?
I am also concerned the HO will see the green #10 to the EGC bar and think he's not "well grounded." I think I may install as large of EGC that will fit with my other secondary conductors, perhaps a #8 or even #6 (which may overfill my 1" smurf). Would you do the same?
I hope this is detailed enough to paint an accurate description of the install.