STV Transfer Sw / Service Panel

[Mvillines]

This is an installation installed on a dwelling last week. This is a transfer switch with the service conductors entering the top of the panel and the generator conductors are entering the right side near the bottom. There are four conductors leaving the bottom of the panel serving the MDP. All conductors are of the correct size and type.
The item I believe to be in violation is taken from part II of article 250. Maybe other violations I missed. Oh yes?.the printed circuit board is not secured, waiting for the clips to arrive.

 

[Buck Parrish]

I would say yes, It needs an equipment ground. Neutral and grounds must be isolated after the first disconnect.

 

[LarryFine]

I would say yes, It needs an equipment ground. Neutral and grounds must be isolated after the first disconnect.

There is one, the bluish wire, as long as the neutral is isolated, as you mentioned.

I can't help but wonder whether it's okay that the backplate is part of the MBJ?

 

[Mvillines]

Yeah, at least that?s my way of thinking. 250.24(A)(4) state that where the main bonding jumper is a wire or busbar and is installed from the grounded conductor terminal bar or bus to the equipment grounding terminal bar or bus in the service equipment, the grounding electrode conductor shall be permitted to be connected to the equipment grounding terminal bar, or bus to which the main bonding jumper is connected.

Since the main bonding jumper in this panel is a screw, that would require the GEC to be connected to the grounded terminal bar, right?

Is this rule a cause of the screw not being tested or listed as being a part a grounding electrode circuit?

 

[LarryFine]

Is this rule a cause of the screw not being tested or listed as being a part a grounding electrode circuit?

I believe the screw is adequate for bonding the panel to the neutral, but not for bonding the EGC's and GEC's to the neutral.

If I'm correct, there should be a conductor interconnecting the neutral and EGC/GEC buses. The enclosure alone is not adequate.

 

[augie47]

Agree. The grounding electrode conductor should be connected to the grounded conductor.

If it's '08 Code where in the inter-system bonding terminal (250.94)

sidebar: I don;t recall ever seeing a transfer swith with the generator breaker installed likie this. Is the OCP at the generatior itself ?

 

[Mvillines]

Agree. The grounding electrode conductor should be connected to the grounded conductor.

If it's '08 Code where in the inter-system bonding terminal (250.94)

sidebar: I don;t recall ever seeing a transfer swith with the generator breaker installed likie this. Is the OCP at the generatior itself ?

Kentucky is still under the 05 edition. For the inter-system bonding its common in this area to leave a space between the bottom of the service panel or meter base (which ever is used for the (GEC)) and the top of the PVC encasing the GEC as can be seen in the photo. The other utilities install their connector to bond their system to the electrical grounding system. Actually this method of inter-system bonding has been used here for many years with zero problems.

Yes, there is an OPD on the generator. I don?t know who actually makes this panel, the name on the cover is Briggs & Stratton Power Products. It?s UL listed for SUSE.