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#59050 - 11/25/05 04:04 AM Do Not Break Sign on Breaker!!  
Wireless  Offline
Member
Joined: Jun 2005
Posts: 73
Los Angeles CA USA
I was at a job today and noticed on some the breakers a metal bracket with a set screw in it over the switch on the breaker so that no one would shut that breaker off. They even took off the common tie on the main to put these brackets on is the breaker still able to trip?


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#59051 - 11/25/05 06:55 AM Re: Do Not Break Sign on Breaker!!  
George Corron  Offline
Member
Joined: May 2001
Posts: 717
Lorton, Va USA
Locking a breaker in the energized position does not affect it's ability to open the circuit. Very common (and legal, BTW) practice for mission critical and some life safety equipment.


#59052 - 11/25/05 08:48 AM Re: Do Not Break Sign on Breaker!!  
LearJet9  Offline
Member
Joined: Apr 2005
Posts: 197
Millis, MA USA
You indicate "they took off the common tie." If this is a multi-pole breaker taking off the common tie does in fact violate NEC rules. That means that 1 of the poles can trip leaving the other pole(s) live. No a good situation.


#59053 - 11/28/05 12:26 PM Re: Do Not Break Sign on Breaker!!  
dlhoule  Offline
Member
Joined: Apr 2005
Posts: 73
Saline, MI 48197
We have a lot of energy conscious people here where I work. Prior to installing these clips on single pole breakers feeding emergency lighting and exit signs. We would frequently fail our monthly inspections due to batteries having been discharged without adequate time to recharge.

They are legal and at times provide a simple solution to a problem.


#59054 - 11/28/05 05:11 PM Re: Do Not Break Sign on Breaker!!  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
Lear

Quote
You indicate "they took off the common tie." If this is a multi-pole breaker taking off the common tie does in fact violate NEC rules. That means that 1 of the poles can trip leaving the other pole(s) live. No a good situation.


While I agree taking the factory installed handle is a violation I do not agree with the rest of your statement.

A "Common Trip Breaker" will trip all poles on a short or overload regardless of the handles. A "Common trip Breaker" has an internal mechanism to make sure of that.

The only thing that handle ties ever guarantee is the opening or closing of all poles when switched by hand.

Bob


Bob Badger
Construction & Maintenance Electrician
Massachusetts


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