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Actuators for dampers #95813
10/07/05 12:51 PM
10/07/05 12:51 PM
B
bdh45  Offline OP
Junior Member
Joined: Jul 2005
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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Re: Actuators for dampers #95814
10/07/05 03:16 PM
10/07/05 03:16 PM
R
raider1  Offline
Member
Joined: Jul 2005
Posts: 46
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

Re: Actuators for dampers #95815
10/08/05 02:11 AM
10/08/05 02:11 AM
S
Sparks30  Offline
Member
Joined: Mar 2002
Posts: 125
Connecticut.usa
Most of the actuators I work on are 24v class 2. No need for disco.

Re: Actuators for dampers #95816
10/08/05 07:46 AM
10/08/05 07:46 AM
I
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
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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