Isolated ground

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Andy Delle

Senior Member
Location
Los Angeles CA
Based on my experience, most AHJ's would probably like to see isolated ground system go away. More often than not they are not installed correctly. Some even downright unsafe like tying the IG to a separate UNBOUNDED grounded rod.
 

mpoulton

Senior Member
Location
Phoenix, AZ, USA
The code never recommends or requires them, because there is no situation where they are actually needed. IG is a relic of the days when electronics were new and didn't behave well - mostly analog interference problems. This just isn't much of an issue anymore because sensitive equipment has the necessary filtering and isolation built in.
 

ron

Senior Member
As mentioned 250.96(B) and 250.146(D) permits it and offers some rules, but nobody uses them anymore. There are other section too.

You don't mean isolated power system, right? Like in Chapter 5?
 

MiElectrician

Member
Location
mi
I installed an isolated system last year. If the engineer wants it put it in. But I'm assuming it's a commercial building so the receptacle locations will be on the print. From the little I've seen they usually want one near each desk that will have a computer.
 
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