Single Phase motor amps

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dandcmartin2016

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Mill City, OR / Linn County
a 240 volt single phase room a/c shall be considered as a single phase motor unit if its rating is not more than__.?

a. 20 amps
b. 25 amps
c. 30 amps
d. 40 amps

another question I have spent over 30 minutes on. Need the code reference from the 2017 NEC
I've used the code reference book and I don't seem to see it. I believe it's 40amps but again I can not locate the exact question

HELP PLEASE!
 
dandcmartin2016 said:
a 240 volt single phase room a/c shall be considered as a single phase motor unit if its rating is not more than__.?

a. 20 amps
b. 25 amps
c. 30 amps
d. 40 amps

another question I have spent over 30 minutes on. Need the code reference from the 2017 NEC
I've used the code reference book and I don't seem to see it. I believe it's 40amps but again I can not locate the exact question

HELP PLEASE!
Click to expand...


How did you arrive at 40 amps?
 
infinity said:
How did you arrive at 40 amps?
Click to expand...
I assume he got there from the following:

440.62 Branch-Circuit Requirements.
(A) Room Air Conditioner as a Single Motor Unit. A room air
conditioner shall be considered as a single motor unit in determining
its branch-circuit requirements where all the following
conditions are met:
(1) It is cord- and attachment-plug-connected.
(2) Its rating is not more than 40 amperes and 250 volts, single phase.
(3) Total rated-load current is shown on the room air conditioner nameplate rather than individual motor currents.
(4) The rating of the branch-circuit short-circuit and ground fault protective device does not exceed the ampacity of the branch-circuit conductors or the rating of the receptacle,
whichever is less.

However, the wording of the question is a bit misleading to the test taker. It says " single phase motor unit" and the actual language says single motor unit. The key would be in item 2 where it is not more than 40 amps and 250 volts, single phase.

But I think Infinity is asking...did you guess....LOL...
 
MasterTheNEC said:
I assume he got there from the following:

440.62 Branch-Circuit Requirements.
(A) Room Air Conditioner as a Single Motor Unit. A room air
conditioner shall be considered as a single motor unit in determining
its branch-circuit requirements where all the following
conditions are met:
(1) It is cord- and attachment-plug-connected.
(2) Its rating is not more than 40 amperes and 250 volts, single phase.
(3) Total rated-load current is shown on the room air conditioner nameplate rather than individual motor currents.

However, the wording of the question is a bit misleading to the test taker. It says " single phase motor unit" and the actual language says single motor unit. The key would be in item 2 where it is not more than 40 amps and 250 volts, single phase.

But I think Infinity is asking...did you guess....LOL...
Click to expand...

I only asked because he stated that after 30 minutes he couldn't find the answer but there it is. ;)
 
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