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ekstra   ara
 Post subject: electric meter testing and calibration
PostPosted: Fri Dec 05, 2014 1:35 pm 
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Joined: Wed Oct 01, 2008 6:05 am
Posts: 26
I assume with the new NFPA70E most people will be sending their meters directly to the manufacturer for testing and calibration (i.e. Fluke), right? So we should expect long(er) lead times with the deluge of companies needing to do this? And all of us will need to have spare meters to cover us in the interim, right? Are there testing companies sprouting up that are certified to do this calibration?


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 Post subject: Re: electric meter testing and calibration
PostPosted: Fri Dec 05, 2014 3:11 pm 
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Location: North Carolina
Not sure why this would matter. Testing/calibration was required in 250.3 in the 2012 edition.

Testing for calibration is typically advertised to NIST or ISO standards. Either way a certified test source is used to generate voltages/currents at the extremes of the meter range and the readings are recorded (usually 2 or 3 points maximum). Then an error is calculated and compared to the data sheet to say if it meets manufacturer specification or not.

This is different compared to say UL testing which includes testing under various failure prone scenarios.


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