24v Electric Damper Transformer

[mstrlucky74]

Have about 10 24v electrical dampers in very close proximity to each other all be feed by 2 circuits. Each damper location also calls for manual motor starter with thermal overload toggle switch type. Note says contractor will supply transformers and electrical to install and wire. Can't locate any model in mechanical spec. Thinking something similar to this(link below) will work but not sure if there would be a transformer at each damper or one transformer could control a few dampers.

There are different VA models so that would affect wiring scenario. Just not sure which is the most common application. Thanks.


https://www.kele.com/Catalog/18 PowerSupplies/PDFs/RIB TR Series Catalog Page.pdf

 

[Russs57]

I’d see if they would allow control transformer with built in breaker. Save a ton of money.

Not sure if one could find heaters with small enough current rating to actually protect a damper motor.

Typically I feed them all from one transformer with primary and secondary fuses and don’t bother with overload protection for each damper motor.

 

[mstrlucky74]

I’d see if they would allow control transformer with built in breaker. Save a ton of money.

Not sure if one could find heaters with small enough current rating to actually protect a damper motor.

Typically I feed them all from one transformer with primary and secondary fuses and don’t bother with overload protection for each damper motor.

So if I have 5 dampers fed off one circuit I could possibly feed those 5 dampers with one Transformer

 

[nec_addicted]

Damper Actuators with dry type transformer

Damper Actuators with dry type transformer

BELIMO

 

[mstrlucky74]

But I'm confused. Each damper location has motor rated toggle that need 120v. So if I install the xfrmr to control 5 damper on 1 circuit I'd bring 120v to motor rated toggles then 20v to xfrmr line side then 24v out of xfrmr to all the damper? Something doesn't seem correct.

 

[Ingenieur]

But I'm confused. Each damper location has motor rated toggle that need 120v. So if I install the xfrmr to control 5 damper on 1 circuit I'd bring 120v to motor rated toggles then 20v to xfrmr line side then 24v out of xfrmr to all the damper? Something doesn't seem correct.

is the switch for starting/operating damper or just a disconnect?
use 1 xfmr to feed multiple switches
there is no issue feeding the switch 24 (unless it has a light)
in fact the lower v may raise the i enough to get an appropriate ol rating