424.19

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augie47

augie47

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Do the changes in '14 to 424.19 require that a locking provision will have to be installed when the space heating disconnects consist of breakers mounted in the cover of the unit ?
 
augie47 said:
Do the changes in '14 to 424.19 require that a locking provision will have to be installed when the space heating disconnects consist of breakers mounted in the cover of the unit ?
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I'd say no because I am assuming the disconnects you are referring to "on the unit" are within sight . Not sure if you have more than 1 feeder or branch circuit feeding a single unit in your example though but even with that I'd assume the breaker lock would be at the originating location of the feeder or branch circuit.
 
augie47 said:
Do the changes in '14 to 424.19 require that a locking provision will have to be installed when the space heating disconnects consist of breakers mounted in the cover of the unit ?
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http://ecmweb.com/code-basics/article-424-fixed-electric-space-heating

"You can also use the switch on the heater unit itself as a disconnect, if it has a marked “off” position that is an integral part of the equipment, and the switch disconnects all ungrounded conductors of the circuit [424.19(C)] (Fig. 1)."
 
All well & good but the link is to an Article written in 2008. It appears the added wording in '14 requires the disconnects to be lockable regardless of location.
 
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augie47 said:
All well & good but the link is to an Article written in 2008. It appears the added wording in '14 requires the disconnects to be lockable regardless of location.
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That appears to only apply to A and B. C has not changed.
 
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dkidd said:
That appears to only apply to A and B. C has not changed.
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I agree as far as Art 422.31 is concerned, but in 424 where the Fixed Electric Space Heating is specifically addressed the wording seems to call for "lockable" regardless.(A '14 Code change)


III. Control and Protection of Fixed Electric
Space-Heating Equipment
424.19 Disconnecting Means. Means shall be provided to simultaneously disconnect the heater, motor controller(s),and supplementary overcurrent protective device(s) of all fixed electric space-heating equipment from all ungrounded conductors. Where heating equipment is supplied by more than one source, feeder, or branch circuit, the disconnecting
means shall be grouped and marked. The disconnecting means specified in 424.19(A) and (B) shall have an ampere rating not less than 125 percent of the total load of the motors and the heaters and shall be lockable in accordance with 110.25.
 
augie47 said:
I agree as far as Art 422.31 is concerned, but in 424 where the Fixed Electric Space Heating is specifically addressed the wording seems to call for "lockable" regardless.(A '14 Code change)


III. Control and Protection of Fixed Electric
Space-Heating Equipment
424.19 Disconnecting Means. Means shall be provided to simultaneously disconnect the heater, motor controller(s),and supplementary overcurrent protective device(s) of all fixed electric space-heating equipment from all ungrounded conductors. Where heating equipment is supplied by more than one source, feeder, or branch circuit, the disconnecting
means shall be grouped and marked. The disconnecting means specified in 424.19(A) and (B) shall have an ampere rating not less than 125 percent of the total load of the motors and the heaters and shall be lockable in accordance with 110.25.
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Where did 422.31 pop up?

The last sentence states that the locking means is only required under 424.19(A) and (B). It doesn't apply under (C), (C) Unit Switch(es) as Disconnecting Means.
 
Yep
I've been working on the "changes" using the IAEI analysis book. The wording was different in the Analysis.. clearer in the actual Code. sorry 'bout that.
 
augie47 said:
Yep
I've been working on the "changes" using the IAEI analysis book. The wording was different in the Analysis.. clearer in the actual Code. sorry 'bout that.
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Actually, the language in the ECM article was not quite accurate. May have come out before the final version or something.
 
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