- Location
- New Jersey
- Occupation
- Journeyman Electrician
I often wondered why you would need to run a GEC to building steel for a Delta/Wye transformer that's located inside of a building? I always assumed it had to do with 250.4(A)(1) but do any of the things mentioned in that section really apply to a transformer on the 20th floor? Any faults on the secondary side of the transformer will be carried back to the system via the system bonding jumper. Is this all about voltage stabilization or am I missing something?
(A) Grounded Systems.
(1) Electrical System Grounding. Electrical systems that
are grounded shall be connected to earth in a manner that
will limit the voltage imposed by lightning, line surges, or
unintentional contact with higher-voltage lines and that will
stabilize the voltage to earth during normal operation.