Watthour meter in plenum space

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NeilHunt

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We want to temporarily (for several months) monitor power consumption of two fluorescent fixtures in an overhead plenum space above the lay-in ceiling.

We propose to use a SJ corded, with a three prong plug, watthour meter. The two fixtures would be plugged into the meter.

How do we meet code in this temporary metering installation?

Thank you.

Neil Hunt
Hillcrest Consulting Group
Albuquerque, New Mexico
 
Re: Watthour meter in plenum space

Article 527.3(C) deal with temporary testing and time constraints.

However, is the overhead space above the lay-in ceiling actually a plenum or are their separate supply and return ducts? I'm not to sure that SJ would be plenum rated.
 
Re: Watthour meter in plenum space

Originally posted by NeilHunt:
We want to temporarily (for several months) monitor power consumption of two fluorescent fixtures in an overhead plenum space above the lay-in ceiling.
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May I ask the purpose of this?

We install power monitoring equipment quite often but it is always at a panel or service which has load diversity.

There is no load diversity in two fluorescent fixtures other than perhaps the run time which should be able to be reasonably estimated.

I would think you would just take a reading of the power consumed by one fixture while running and extrapolate that into what is used by both for several months.
 
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