generator ground rod

[busman]

Again, my point is that power IS going to the generator.

Mark

 

[wirebender]

We installed a Generac earlier this year and the instructions called for a ground rod if required by local codes.

 

[360Youth]

right...my question is whether it required two ground rods....like you would usually do for a service

Your question seems to have gotten lost in the discussion (of which like to read because we do a lot of generators and I am always at a toss up because manuf. specs seem to contradict NEC). Most AHJs that I have dealt with that require two rods at a service want two at the generator also.

 

[Twoskinsoneman]

Again, my point is that power IS going to the generator.

Mark

Okay. I guess if you run 2 branch circuits out to the gen building you need the rods.

Unless you've got those circuits you don't qualify for rods under 250.32

 

[M. D.]

250.56 requires 2 ground rods as part of the grounding electrode system. Do i need to drive 2 rods for a generator or will 1 be ok?

The lug is on the frame so as far as i can tell it's only an equipment ground for the generator frame.

What is the Name and model number ?? We could then look at the installation instructions ....

This 110.3(b) issue is always an interesting one ,.but since it is the testing agency that decides what is and what is not part of the listing and labeling and they have folks making statements like this ..

http://www.ul.com/tca/ec/october06.pdf

......110.3(B) of the NEC, is not limited to markings on the
product, separately provided installation instructions or
information on equipment packaging. For UL certified
products, compliance also requires following the UL Guide
Information......

it makes for a niffty rock and hard place....IMO 110.3(b) needs improvement.

 

[iand74]

I do drive a rod for units with such a lug. I mention it to the customer, charge for doing it, and it's perceived as part of a well-done installation.

It certainly doesn't hurt if the genny is hit by lightning. I wouldn't want to have to defend not having driven one if such a freak accident happened.

right, i was always planning on driving a ground rod i was just wondering if i needed to drive two. what do you usually do?

 

[LarryFine]

We installed a Generac earlier this year and the instructions called for a ground rod if required by local codes.

Interestingly enough, the same thing happened to me in regard to distance between the house and the genny. The customer wanted it close for appearance sake, and the unit had no rear louvers, so the gas piping made it about 5" away.

The plumbing inspector failed it. Naturally, I challenged him.

The county rules specify following the manufacturer's installation requirements, so we looked in the book. Of course, it says to space in compliance with local ordinances.

So, it got to stay. Everyone's happy. 'Specially me!

 

[LarryFine]

right, i was always planning on driving a ground rod i was just wondering if i needed to drive two. what do you usually do?

One rod, as close as possible to the pad, using maybe 1' of #6 solid.

 

[infinity]

right, i was always planning on driving a ground rod i was just wondering if i needed to drive two. what do you usually do?

Since the ground rod isn't required by the NEC you're only bound by what the manufacturer requires as part of the products' listing. So if Generac says ground rod you only pound in one.