We did a study for one of our clients five years ago based on IEEE 1584 and NFPA 70E when the CSA Z462 was not available. According to the Standards, a review is required for the old labels and the labels are to be replaced with new date on it for next 5 years period. How do you guys to deal with this kind of review? Thanks!

Z462 and 70E are identical except for formatting and some of the annexes. We don't enccounter the 5 year rule since we continuously update as needed. The thing that would throw things off is the amount of backfed energy from reactive loads.

I don’t believe you are required to replace all the labels just because the date on them is five years old.

The analysis is required to be updated whenever major modification or renovation takes place, in which case you’d update the one-line diagrams and replace any old labels affected by these changes.

The periodic review, not to exceed five years, is to account for any changes in the distribution system that could affect the results of your analysis. During this time you should probably also ensure the updates required for modifications/renovations has been occurring and perhaps do an audit to check for missing or illegible labels. Then I’d simply document that a review has been completed. I don’t believe there’s any reason to replace labels if the voltage, AFB and IE information has not changed.

Don't know about the Z462 but the NFPA 70E 2012 has an exception in 130.5(C) that reads:

"Labels applied prior to September 30, 2011, are acceptable if they contain the available incident energy or required level of PPE."