Damper Connections

horsegoer

Senior Member
I've always noticed almost all dampers are shown on electrical drawings with a J-Box symbol. They really never require a j-box though. You wired in/out of the actuator.
 

infinity

Moderator
Staff member
The dampers usually come with an integral box. Not sure why they would indicate a JB on the drawings when you typically do not need another box but you're correct they're almost always drawn that way.
 

brantmacga

Senior Member
Pretty common to see a hardwired appliance or motor indicated as a j-box on drawings.


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cdslotz

Senior Member
Pretty common to see a hardwired appliance or motor indicated as a j-box on drawings.


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Yep...and a lot of times the dampers, VAV's, unit heaters, etc are in EMT runs due to distance or they are on circuits with different voltages....so J-box and whip is common
 

horsegoer

Senior Member
Yep...and a lot of times the dampers, VAV's, unit heaters, etc are in EMT runs due to distance or they are on circuits with different voltages....so J-box and whip is common
not really true for vav and dampers ...many time 8-10 on same circuit.
 

infinity

Moderator
Staff member
not really true for vav and dampers ...many time 8-10 on same circuit.
I believe that what he's saying is that if you had the branch circuit run in EMT you wouldn't pipe directly into the damper box you would use a junction box with a whip at each. For MC cable it's more likely to just go directly into the damper junction box.
 

horsegoer

Senior Member
I believe that what he's saying is that if you had the branch circuit run in EMT you wouldn't pipe directly into the damper box you would use a junction box with a whip at each. For MC cable it's more likely to just go directly into the damper junction box.
yes I agree for pipe
 

horsegoer

Senior Member
I assumed that your spec limits use of MC to fixture/equipment whips and does not allow MC to be run wild like romex throughout a commercial space.
Not the case. MC is allowed often for all branch wiring in concealed locations of small single phase motors, wiring devices, lighting etc.
 
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