Corner Ground Delta

[jim dungar]

While that is what the code requires, I have never seen the grounded conductor of a corner grounded system actually identified that way in the field.

How long has this been required. I want to say it's only been 20ish years.

 

[don_resqcapt19]

How long has this been required. I want to say it's only been 20ish years.

It has always been required. As soon as you call it a grounded conductor, Article 200 applies.
It seems that most industrials did not think that Article 200 applied in the past.

 

[ptonsparky]

The one new system I did has been at least 40 years.

 

[jim dungar]

It seems that most industrials did not think that Article 200 applied in the past.

For sure that was the philosophy up here, unless it was new construction.
The old thought was the NEC did not apply to production processes, which slowly morphed into including the break locker rooms as well as offices.

Some 30 years ago, the state state started to say just because a local permit was not required for production process did not mean the NEC was optional.