Iso Ground

J

JayBuud

New User
Location
Minnesota
Occupation
Electrician
I need to pull six 10AWG circuits from my panelboard up to a 24x24 in one pipe and all circuits require an iso ground. Does each circuit need its own dedicated iso or can I get away with pulling only one and splicing off it in that 24x24 and would I have to upsize it? Can’t seem to find it in the code.
 
As far as I know the NEC only addresses Iso Grounds in 250.146.
A "common" IG vs individual IG would be a design issue, not a NEC issue.
 
The NEC doesn't care how you install isolated ground conductors so you could pull a single IG for all of the circuits within the raceway. The designer may prefer one for each circuit but that is not required for code compliance.

Edit: what Augie said. IGs are so useless I wouldn't pull more than one unless so directed
 
Tyler C said:
My favorite part of IGs is when they get specified for a POS system which ends up being a tablet with a 1-15P USB adapter.
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In the last 15 years that's the only place where I've seen them used. It was for two POS cash registers. I asked the foreman how we were going to use IG's when we had no provisions for them in any panel. He just put an orange IG receptacle in and bonded it to the box. Worked just fine. ;)
 
I
infinity said:
In the last 15 years that's the only place where I've seen them used. It was for two POS cash registers. I asked the foreman how we were going to use IG's when we had no provisions for them in any panel. He just put an orange IG receptacle in and bonded it to the box. Worked just fine. ;)
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Over the oast few years ive hooked up a dozen ICPMS's (inductively coupled plasma Mass spectrometer) for my client. I happen to read through the manual kind of recently and noticed they we're supposed to have IGS. Opps. They're all working totally fine.
 
infinity said:
What's wrong with an orange IG receptacle?
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If you install a receptacle identified as IG, you must use an isolated EGC.

406.3 (2023)
(E) Isolated Ground Receptacles.
Receptacles incorporating an isolated equipment grounding conductor connection intended for the reduction of electromagnetic interference as permitted in 250.146(D) shall be identified by an orange triangle located on the face of the receptacle.

(1) Isolated Equipment Grounding Conductor Required.
Receptacles so identified shall be used only with equipment grounding conductors that are isolated in accordance with 250.146(D).
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