Damper Connections

[Alwayslearningelec]

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]

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.

 

[Alwayslearningelec]

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.

Like this.

https://www.grainger.com/product/DAYTON-Square-Motorized-Fire-Smoke-3HGK5

 

[brantmacga]

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


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[cdslotz]

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

 

[Alwayslearningelec]

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]

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.

 

[Alwayslearningelec]

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

 

[cdslotz]

yes I agree for pipe

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.

 

[Alwayslearningelec]

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.