bahogge
Electrical
- Nov 9, 2006
- 2
If a 12.47kV/480-277V transformer serves a building via underground PVC conduits encased in ductbank, does an equipment bonding jumper need to be routed with the phase conductors from the service disconnect back to the transformer? This assumes the grounding electrode connection is made at the service disconnect. It appears the 2005 handbook shows that to be the case for a separately derived system, but other illustrations in section 230-services only show the grounded conductor (neutral) routed back to the transformer. Thanks for any insight to clear up my confusion or misinterpretation.