Rotating Shaft Equipment Grounding Specs??

[sprintcar]

I need a bit of help folks.
We're trying to explain to a Russian customer that all the individual components of a pump assembly (ie shell, bearing assy, pedestal) do not require individual grounding lugs since they are assembled as a unit (bare metal contact) with multiple fasteners.

This is then bolted (again, bare metal) to the subframe which is anchored & grouted to the concrete floor pad. The subframe has a ground connection.
The electric motor is grounded appropriately and we never see any requirement past that.

I tried google searching but didn't find any related to this type assembly issue.

Does anyone know of an international standard that I could reference? They are quoting their GOST 12 and 21 which we do not have. The language barrier isn't helping much either!
Many thanks!

"If A equals success, then the formula is: A = X + Y + Z, X is work. Y is play. Z is keep your mouth shut."
-- by Albert Einstein

 

[resqcapt19]

While not exactly the same, the NEC does make some provisions along those lines.

250.136 Equipment Considered Effectively Grounded
Under the conditions specified in 250.136(A) and (B), the non–current-carrying metal parts of the equipment shall be considered effectively grounded.
(A) Equipment Secured to Grounded Metal Supports Electrical equipment secured to and in electrical contact with a metal rack or structure provided for its support and grounded by one of the means indicated in 250.134. The structural metal frame of a building shall not be used as the required equipment grounding conductor for ac equipment.

250.134, in general, requires an equipment grounding conductor to be run to the electrical equipment. In your case, the EGC would be run to and terminated at the motor. At that point the other parts of the pump assembly would be "effectively grounded".
Don

 

[ZapSib]

I don't know regarding your problem, but whatever, here in Russia, there is no alternative to comply with GOST, whatever stamment within the standard is fully crazy, you should comply with.

So, I will recomend to get assistance for any institute who will help to get gost certification.
Here, nobody care of ANSI, IEC or other EU/US standard.

paka.