Ansul system

[hbiss]

My understanding is the coil is opened internally when the shunt feature is activated. It doesn't matter what the voltage source is.

However derived, the trip voltage needs to be a pulse or intermittent, just long enough to shut the breaker off. If the voltage is maintained longer than necessary for whatever reason after the breaker is tripped the coil can burn up.

ETA: Or are you under the assumption that the coil is fed through internal contacts within the breaker so that when tripped the coil will be de-energized regardless of whether the control voltage is still there? I believe some do work that way. The ones that don't will be noted on the case.

-Hal

 

[gadfly56]

However derived, the trip voltage needs to be a pulse or intermittent, just long enough to shut the breaker off. If the voltage is maintained longer than necessary for whatever reason after the breaker is tripped the coil can burn up.

ETA: Or are you under the assumption that the coil is fed through internal contacts within the breaker so that when tripped the coil will be de-energized regardless of whether the control voltage is still there? I believe some do work that way. The ones that don't will be noted on the case.

-Hal

Yes, my understanding is as how you restated in your ETA. I thought that was a universal feature.

 

[hbiss]

Actually someone posted a picture of a shunt trip breaker here maybe a year ago that either had the warning about not keeping power applied to the coil continuously on a label on the case or a tag wrapped around the pigtails for the control. So you should be able to tell which one you have but obviously you are going to have to see or know the breaker you are going to use before you decide how to control it.

-Hal

 

[gadfly56]

Actually someone posted a picture of a shunt trip breaker here maybe a year ago that either had the warning about not keeping power applied to the coil continuously on a label on the case or a tag wrapped around the pigtails for the control. So you should be able to tell which one you have but obviously you are going to have to see or know the breaker you are going to use before you decide how to control it.

-Hal

True enough.

ETA
So I found a sheet from GE that lists the various configurations available, and they have both momentary and continuous. There is a note that says:

* Momentary Rated shunt trip requires wiring one or more NO
(Normally Open) breaker aux contact(s) in series with the accessory
to avoid coil damage.

So that, or as was previously suggested, tap one of the hots being controlled.

 

[Stephen Hood]

Ansul system

I have an ansul system with a powder 1.5 gallon fire retardant located directly above the stove hood. What are my requirements for the distance between suppression system and shunt trip breaker panel. Are they allowed within the same cabinet located less than 18 inches apart. Is my shunt trip breaker have to be located in my mdp

 

[LarryFine]

Welcome to the forum. I've done quite a few fire-suppression systems, both new and retro-upgrades.

What are my requirements for the distance between suppression system and shunt trip breaker panel.

Nothing in the NEC about it. Your fire marshal is the best one to ask.

Are they allowed within the same cabinet located less than 18 inches apart.

How might a breaker be in the same cabinet (define 'cabinet') as the suppression system?

Is my shunt trip breaker have to be located in my mdp

Not necessarily, but it does need to be properly enclosed.

Can you post pics, or give us more detail?