Gas Furnace Grounding

[stickboy1375]

So I was wiring a Gas furnace the other day and stumbled across the fact they the manufacture does not include a grounding conductor for all its terminal strips... what the hell is up with that?
You can see a grounding conductor on the supply terminal strip, but it does not extend to the DHW pump terminal strip, or any other device for that matter... so now i have an ungrounded circulator pump.

 

[texie]

So I was wiring a Gas furnace the other day and stumbled across the fact they the manufacture does not include a grounding conductor for all its terminal strips... what the hell is up with that?
You can see a grounding conductor on the supply terminal strip, but it does not extend to the DHW pump terminal strip, or any other device for that matter... so now i have an ungrounded circulator pump.

Did you actually check for continuity from the "G" term to the chassis? It looks like in the photo that it is be bonded with a rivet.

 

[stickboy1375]

Did you actually check for continuity from the "G" term to the chassis? It looks like in the photo that it is be bonded with a rivet.

You know, I never did... and I didn't see the rivet... I will have to check it out when I go back... Now I feel sheepish.

 

[infinity]

Did you actually check for continuity from the "G" term to the chassis? It looks like in the photo that it is be bonded with a rivet.

Bingo. :thumbsup:

 

[Dennis Alwon]

I would bet it is grounded thru the system somewhere else.:thumbsup:

 

[stickboy1375]

Okay, just a quick thought, if the rivet is in fact being the continuity factor, then why did they run a grounding wire out of the supply terminal?

 

[stickboy1375]

I would bet it is grounded thru the system somewhere else.:thumbsup:

I wont know until I go back and test for continuity...

 

[Dennis Alwon]

Okay, just a quick thought, if the rivet is in fact being the continuity factor, then why did they run a grounding wire out of the supply terminal?

My guess is the load side EGC is spliced inside to all the other pieces of equipment. The board must be a generic board that has many uses.

 

[suemarkp]

Is there a way to delete my response????

 

[jxofaltrds]

Okay, just a quick thought, if the rivet is in fact being the continuity factor, then why did they run a grounding wire out of the supply terminal?

I do not think that the rivet does anything but 'hold' the board. The green wire opposite the incoming EGC probably does the bonding.

 

[ActionDave]

I wont know until I go back and test for continuity...

Remember to go back well equipped with all your test equipment.



Refer to your tag line if my joke is to cryptic.

 

[stickboy1375]

I do not think that the rivet does anything but 'hold' the board. The green wire opposite the incoming EGC probably does the bonding.

The green EGC on the load side of the terminal strip attaches to the frame of the boiler.... the question is if that bond is carried through to the external auxiliary equipment, if the rivet does not complete this path, then my DHW circulator is not bonded to the EGC.

 

[jxofaltrds]

The green EGC on the load side of the terminal strip attaches to the frame of the boiler.... the question is if that bond is carried through to the external auxiliary equipment, if the rivet does not complete this path, then my DHW circulator is not bonded to the EGC.

Thanxs. Couldn't deleted my post. Think i understand.

 

[stickboy1375]

Remember to go back well equipped with all your test equipment.



Refer to your tag line if my joke is to cryptic.

:thumbsup: You bet.