EG with conductors

[ptonsparky]

Recently installed a VFD for a submersible pump. While removing the old pump panel I noticed a transfer switch had been installed ahead of it. (Two sevices to the facility plus a generator will allow for pump operation from any one of three sources.) Checking things out I found that the standby side was energized, two of three phases were good, third had no voltage. No EG was installed with those conductors. Direct bury about 500. While the equipment is bonded via the grounded conductor from the normal service I believe that the standby side requires an EG installed with those conductors and informed the owner this needs to be corrected. He is not happy with the EC that installed it.

250.134(B) is my basis, any others?

 

[tom baker]

Did they use the grounded conductor from the TS to the VFD in place of the EGC? Or just no EGC?
250.134 would be the correct section, and could also use 250.4(A)4 & 5 which tells us why to bond, 250.134 tells us how.

 

[ptonsparky]

Originally, my work, the installation consisted of about 1500' direct bury 4 conductors. 240v 3ph hi leg delta. SE 1 (well) is at about 500' in, SE 2 is at 1000' (Fuel pumps) along with a standby generator, SE 3 is at the far end. The generator was to feed only the fuel pumps & misc at SE 2.

Fifteen years later and things have changed. The Gen, now 480 feeds a step down transformer that can feed back to the well via a several transfer switches. It is this feeder that has no EG included.

 

[ptonsparky]

The why is what I wanted, thank you Tom Baker.