If I have a Single Phase 7.5 kva Transformer with a primary voltage of 480 volts (H1, H2) and the secondary voltage is 208 volts phase to phase (X1-X2) for a 208 volt Split unit Air conditioner. On the secondary side of the transformer, I have X1 and X2. Upon the bonding of X2 to the bonding terminal/ Grounding conductor, what phase color is use to mark X2 going to the Split unit disconnect? X1 is Black, X2 is White? Orange stripe marking? Educate me? Thanks..
Bonding of single phase transformer
- Thread starter icooperjr
- Start date
- Location
- New Jersey
- Occupation
- Journeyman Electrician (retired)
What color would you use to designate the ungrounded conductor on the secondary if black is already designated for something else?
Thanks. I was just curious. In all my years, I've never been faced with the opportunity to have to Bond a Single Phase Transformer system with a voltage of 208 from phase to ground on one leg on the secondary. So it kinda puzzled me for a bit as far as the marking. I just wanted to verify it.
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
With two wire secondary you have two choices of what to ground. One conductor or the other. Grounding either one won't change the voltage between them just gives whichever one you choose a reference to ground.
So many are baffled when they run into a grounded conductor that is not also a neutral conductor.