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#95813 10/07/05 01:51 PM
Joined: Jul 2005
Posts: 2
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bdh45 Offline OP
Junior Member
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 04:16 PM
Joined: Jul 2005
Posts: 46
R
Member
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

#95815 10/08/05 03:11 AM
Joined: Mar 2002
Posts: 125
S
Member
Most of the actuators I work on are 24v class 2. No need for disco.

#95816 10/08/05 08:46 AM
Joined: Jan 2003
Posts: 4,391
I
Moderator
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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