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Back feed? #108531 04/01/04 07:54 PM
Joined: Dec 2000
Posts: 4,283
electure Offline OP
Member
Quote
The male end of a cordset was cut off going into this panel. I suspect a generator was used to feed the lower left 2 pole breaker since the black is stripped twice and isn't long enough to reach much else. Also found several breakers and neut's double lugged. Not a big deal but I thought it was kind of funny

KentVW


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Re: Back feed? #108532 04/01/04 08:19 PM
Joined: Jan 2003
Posts: 4,391
I
iwire Offline
Moderator
I consider this a big deal, I have a real problem with people that back feed panels with a generator.

Ask anyone of these people and they will tell you that they will never make a mistake and they will always turn off the service disconnect while they have the generator on line.

Well we are all human and make mistakes, a mistake made here may injury or kill a lineman while they are trying to fix the outage.

Well enough venting, Bob


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Re: Back feed? #108533 04/01/04 08:30 PM
Joined: Feb 2004
Posts: 4
B
big_bobs_electric Offline
Junior Member
Before we assume that was a backfeed- I must make a comment. I have somthing similar on my own panel in the basement, and what I do is when the power goes out, I pop the panel cover and connest the cords wires to my furnace, since it is the only appliance that I need that isn't cord-and-plug connected.

Re: Back feed? #108534 04/03/04 03:12 AM
Joined: Feb 2004
Posts: 1,432
Lostazhell Offline
Member
this kinda looks like a subpanel, with grounds on the neutral bars.... Nice cord grip by the way! [Linked Image] Also, backfeeding both phases on one phase can allow shared neutrals to be overheated.. (Not that the extension cord here could carry enough current to do that though..)

-Randy

Re: Back feed? #108535 04/03/04 08:24 PM
Joined: Mar 2004
Posts: 391
B
BigJohn Offline
Member
And to boot, I'm pretty sure that weather-proof receptacle cover is mounted sideways, the drip edge is now perpendicular to the earth... Could be a violation of 110.3(B).

-John

Re: Back feed? #108536 04/03/04 09:50 PM
Joined: Dec 2000
Posts: 4,283
electure Offline OP
Member
I've got to agree ( [Linked Image] [Linked Image]) with Bob.
A panel backfed this way is a big time hazard to linemen. ...S

Re: Back feed? #108537 04/03/04 09:58 PM
Joined: Sep 2003
Posts: 649
W
winnie Offline
Member
If it is fed 110V to _both_ legs of the panel, then it doesn't present the high voltage hazard usually connected to a backfed panel...the voltage across the transformer secondary would be 0V....

Still ugly and a safety hazard, and I don't intend to defend this practise [Linked Image]

-Jon

Re: Back feed? #108538 04/03/04 11:19 PM
Joined: Apr 2002
Posts: 2,527
B
Bjarney Offline
Moderator
As electricians, we may not agree 100% with what utilities require, but with a clear understanding of the very serious hazard backfeed can create for lineworkers, we should firmly support the prohibition of everything that has the potential of creating such a situation.

This means nothing but professionally installed, listed, lockable, externally-operable, visible-blade, center-off double-throw disconnect switches at the building meter location, and clearly rejecting any tin-can-grade breaker-handle “interlocks” intended for non-utility alternate-power sources.

[Backfeed attempts are also a top-flight way to fry generator sets.]


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