Running machines tripping internally and tripping breaker.

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JdoubleU

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I just recieved a call that our rec building has nuisance tripping on the treadmills. The maintenance person for the treadmills says it is because the branch circuits pulled to the machines are multi-wire circuit. The service feeding these treadmills is 208 3 phase. The treadmills themselves are 120 volt.
 
Jakewhis said:
I just recieved a call that our rec building has nuisance tripping on the treadmills. The maintenance person for the treadmills says it is because the branch circuits pulled to the machines are multi-wire circuit. The service feeding these treadmills is 208 3 phase. The treadmills themselves are 120 volt.
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what is tripping? a gfci? not unheard of with motor loads like treadmills.
 
Jakewhis said:
No, there not on GFCIs.
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what is tripping then? the BC CB?

there are really only a few possibilities.

1. Problem with the treadmill.

2. problem with the CB.

3. problem with the wiring.

If it is a single circuit that keeps tripping that narrows it down.

Really you do not have much information, or have chosen not to give it out so it is almost impossible to even intelligently speculate on what might be going wrong here.

Is this a new problem that recently developed? What debugging steps have been taken and what results were there from these steps?
 
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NO,no,no. I haven't even gone over to troubleshoot the issue yet. The building Manager says that the Circuit breaker and the OCPD in the treadmills them selves keep tripping. The building Manager also says that the gentleman that works on the machine says that it is because the circuit that feeds the machine shares a neutral with other circuits. I don't believe this to be the case but just wanted some input from others.
 
Jakewhis said:
NO,no,no. I haven't even gone over to troubleshoot the issue yet. The building Manager says that the Circuit breaker and the OCPD in the treadmills them selves keep tripping. The building Manager also says that the gentleman that works on the machine says that it is because the circuit that feeds the machine shares a neutral with other circuits. I don't believe this to be the case but just wanted some input from others.
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might be that the internal Cb is some kind of GFCI that does not like MWBC.

are these new machines?

was there any clue to the guy that ran the circuits that MWBC were not allwoed?
 
Jakewhis said:
... the gentleman that works on the machine says that it is because the circuit that feeds the machine shares a neutral with other circuits. I don't believe this to be the case but just wanted some input from others.
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There may be a problem with the circuit, but the fact it shares a neutral with another circuit is not one of them. You are correct.
 
I'd make sure the treadmills are on dedicated circuits first. Then amp it or meg it depending on when the breaker is tripping.
 
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