The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Live Chat Feature
by Admin
01/19/17 09:52 PM
Safety at heights?
by gfretwell
01/19/17 07:16 PM
failed home inspection.
by gfretwell
01/19/17 07:03 PM
Webmaster > Admin
by Admin
01/19/17 05:49 PM
Old Bath Fan
by gfretwell
01/19/17 01:38 AM
New in the Gallery:
Desk-mounted "power-board"
Top Posters (30 Days)
Admin 33
HotLine1 21
Ruben Rocha 16
gfretwell 15
Trumpy 13
Who's Online
0 registered (), 0 Guests and 174 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#194451 - 06/03/10 06:38 AM Service Changes
jes Offline
Member

Registered: 07/12/02
Posts: 103
Loc: CT
I am wondering what is being done by others when changing branch circuits from an older existing service over to a new install. Came upon a case where there was a fault to the armor of some old BX that never blew a fuse on the old service because the enclosure was never bonded to the neutral! Who knows how long it had been that way but on the new install the breaker tripped. What do you guys do for testing on old circuits before landing them in the new equipment?? Knob and tube can be a problem because of crossed neutrals buryied in the building somewhere...

Top
Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#194452 - 06/03/10 12:07 PM Re: Service Changes [Re: jes]
HotLine1 Offline


Member

Registered: 04/03/02
Posts: 6832
Loc: Brick, NJ USA
Jes:
Basically, we tagged the circuits as they were in the old panel, ID'd the neutrals, &/or ID'd the 240 volt and anything else that was 'strange'. Then we terminated on proper amperage CB's & energized one at a time.

When a problem surfaced...we did what was necessary to correct the issue. Occasionally that turned into a bit of additional T&M work.

In this case, experience with 'old' work is the best teacher.

_________________________
John

Top
#194453 - 06/03/10 12:15 PM Re: Service Changes [Re: HotLine1]
macmikeman Offline
Member

Registered: 07/16/02
Posts: 718
Loc: Honolulu, Hawaii
Hello, been a while. I tag and record each connected circuit prior to disconnecting, paying attention to what amperage breaker the circuit is currently connected to. Lots of times you can find situations where #12 is used to start the circuit in existing, but later #14 is used in that circuit, and the breaker is a 15 amp existing. In those cases it is very important to connect back to a 15 amp breaker again on replacement. Taking a few photo's of the existing is sometimes a bit of help as well.

Top


ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals