Jump to content

1978 Sub-panel


Mark P
 Share

Recommended Posts

All in same building.

In that case, the sub panel grounding conductors and neutral conductors were supposed to be isolated. Just like today. My reference is the 1975 NEC, Article 250-61(b).

I can personally only trace this back to the 1947 NEC.

Douglas has traced it back further, but I'm not sure about the edition. For some reason 1923 sticks in my head.

Jim Katen, Oregon

Link to comment
Share on other sites

All in same building.

In that case, the sub panel grounding conductors and neutral conductors were supposed to be isolated. Just like today. My reference is the 1975 NEC, Article 250-61(b).

I can personally only trace this back to the 1947 NEC.

Douglas has traced it back further, but I'm not sure about the edition. For some reason 1923 sticks in my head.

Jim Katen, Oregon

Other than GECs, would there be any grounding conductors before 1947?

Link to comment
Share on other sites

All in same building.

In that case, the sub panel grounding conductors and neutral conductors were supposed to be isolated. Just like today. My reference is the 1975 NEC, Article 250-61(b).

I can personally only trace this back to the 1947 NEC.

Douglas has traced it back further, but I'm not sure about the edition. For some reason 1923 sticks in my head.

Jim Katen, Oregon

Other than GECs, would there be any grounding conductors before 1947?

Yes. While there weren't equipment grounding conductors as we know them today, many of the old electrical books discuss grounding of conduits, cable sheaths, cabinets, frames, & so on.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...