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#95813 - 10/07/05 10:51 AM Actuators for dampers
bdh45 Offline
Junior Member

Registered: 07/21/05
Posts: 2
Are HVAC actuators for commerecial dampers considered motors? Do they have to meet the disconnect requirement in NEC 430.101? Any opinions would be appreciated.

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#95814 - 10/07/05 01:16 PM Re: Actuators for dampers
raider1 Offline
Member

Registered: 07/08/05
Posts: 46
Loc: north logan, utah, US
I would tend to classify a damper actuator as an appliance.

422.31 (A): For permanently connected appliances rated at not over 300 VA or 1/8 HP, the branch-circuit overcurrent device shall be permitted to serve as the disconnecting means.

Most of the damper actuators that I have seen are pretty small.

Just MHO.

Chris

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#95815 - 10/08/05 12:11 AM Re: Actuators for dampers
Sparks30 Offline
Member

Registered: 03/23/02
Posts: 125
Loc: Connecticut.usa
Most of the actuators I work on are 24v class 2. No need for disco.

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#95816 - 10/08/05 05:46 AM Re: Actuators for dampers
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
 Quote:
Most of the actuators I work on are 24v class 2. No need for disco.


I do not see the fact that it is class 2 as the determining factor.

Disconnect switches are not only to keep us from getting shocks but also to keep us from getting caught in moving parts.

Many 24 volt damper motors can provide enough torque to amputate a finger.

I would like to believe that raider1 has the answer with 422.31 (A) but I am really not sure.
_________________________
Bob Badger
Construction & Maintenance Electrician
Massachusetts

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