Electromatic
Senior Member
- Location
- Virginia
- Occupation
- Master Electrician
I'm working on my first elevator installation. There are separate elevator and fire alarm contractors. I'll pick their brains when the time comes, but I'm trying to get ahead on my understanding.
We installed a Littelfuse shunt trip disconnect.
https://m.littelfuse.com/~/media/el...ttelfuse_lps_operation_maintenance_manual.pdf
LPS2T20R1KGBF3 to be precise
Phase I of this building was several years ago, and there is a 125A shunt trip breaker already in one of the panels for the elevator. Do I even need the shunt breaker if we've installed this shunt disconnect? The elevator machine room is sprinklered, and I understand that power needs to be shut off before the sprinklers are triggered. Is that just power to the controller (i.e. power would still be present in the machine room coming into the disconnect), or should all the power be shut off via the shunt breaker in the panel in a separate room?
If I do need to use the shunt breaker, how would it be connected to the shunt disconnect? It seems like the N.O. fire alarm would be the place to land the breaker shunt signal, but it is also triggering the disconnect shunt. It seems like that could cause issues if one triggers before or after the other. And would I take power from the shunt breaker panel to the disconnect and back or use the 120V from the CPT in the disconnect?
Thanks as always,
We installed a Littelfuse shunt trip disconnect.
https://m.littelfuse.com/~/media/el...ttelfuse_lps_operation_maintenance_manual.pdf
LPS2T20R1KGBF3 to be precise
Phase I of this building was several years ago, and there is a 125A shunt trip breaker already in one of the panels for the elevator. Do I even need the shunt breaker if we've installed this shunt disconnect? The elevator machine room is sprinklered, and I understand that power needs to be shut off before the sprinklers are triggered. Is that just power to the controller (i.e. power would still be present in the machine room coming into the disconnect), or should all the power be shut off via the shunt breaker in the panel in a separate room?
If I do need to use the shunt breaker, how would it be connected to the shunt disconnect? It seems like the N.O. fire alarm would be the place to land the breaker shunt signal, but it is also triggering the disconnect shunt. It seems like that could cause issues if one triggers before or after the other. And would I take power from the shunt breaker panel to the disconnect and back or use the 120V from the CPT in the disconnect?
Thanks as always,