Manufacturers install instructions

[nizak]

Have a EV charger that says that the E.G.C. needs to be the same wire gauge as the ungrounded conductors.

Circuit is protected at 100 amps w/ #3 thhn conductors.

Does there install instructions supersede the NEC when it comes to grounding?

 

[jim dungar]

Instructions are allowed to have stronger requirements than the NEC, however they may not be lesser.

 

[qcroanoke]

Did a lot of UPS's with that requirement for the ground

 

[retirede]

What brand and model number?

 

[nizak]

What brand and model number?

I’m

What brand and model number?

Grizzl-E
GRU-077-W-HW-25DJ80-A-GB

 

[LarryFine]

Does there install instructions supersede the NEC when it comes to grounding?

Generally speaking, the more stringent of either applies, so yes, they can.

Kinda like requiring copper where aluminum is otherwise compliant.

 

[Little Bill]

Sounds like the requirements that hot tub mfg spec for the EGC. I have never installed an EGC same size as the line conductors and never been called on it.

 

[LarryFine]

I have never installed an EGC same size as the line conductors and never been called on it.

Agreed. I don't remember an inspector ever asking to see the installation instructions for anything.

 

[ppsh]

Junction box or panel before the charger, convert from Al to CU, and upsize the EGC?

 

[retirede]

I’m

Grizzl-E
GRU-077-W-HW-25DJ80-A-GB

OK. I looked at the installation manual. It looks to me like they copied the section on grounding from their smaller, cord and plug models. They likely didn’t intend to require a full size EGC on this unit. Unfortunately, that doesn’t mean you can ignore it.

 

[retirede]

Junction box or panel before the charger, convert from Al to CU, and upsize the EGC?

Item 2 in the instructions doesn’t allow that. See post 10.

 

[qcroanoke]

Agreed. I don't remember an inspector ever asking to see the installation instructions for anything.

Larry I remember one of your first replies to me on my question on wiring a tanning bed was R.T.F.M.
and my reply was if I had T.F.M I would have read T.F.M.
Set off quite a few replies from "what does that mean?"
To other variations of it.

 

[LarryFine]

Larry I remember one of your first replies to me on my question on wiring a tanning bed was R.T.F.M.
and my reply was if I had T.F.M I would have read T.F.M.
Set off quite a few replies from "what does that mean?"
To other variations of it.

But you weren't the inspector, right?

 

[qcroanoke]

But you weren't the inspector, right?

No. I was in quality control at the time so reading manuals on equipment was one of my tasks.
but I was wiring the tanning bed for a friend.

 

[wwhitney]

It looks to me like they copied the section on grounding from their smaller, cord and plug models. They likely didn’t intend to require a full size EGC on this unit. Unfortunately, that doesn’t mean you can ignore it.

I don't know, makes me think that all of Section 4.2 is in error. I'm in favor of the idea that you can ignore obviously erroneous parts of the manual.

This also raises the question of whether the entire installation manual counts as part of the "listing and labeling" for the purposes of 110.3(B).

Cheers, Wayne

 

[garbo]

To my reasoning installing a ground wire the same size as line wires ( larger then 10 guage ) is a waste of money. On a short the ground wire only carries current for milliseconds. Like other poster said never been called on reduced ground found in every larger NM cable. Instructions demanding such things are too often written by electronic nerds Who do not know the code.