Yes.
It is not usually an issue because you typically have other required clearances as well.
Working spaces apply to equipment that are "likely to require examination, adjustment, servicing, or maintenance while energized".
Arguably, transformers get examined while energized. Kind of the only way to test them. Whether it is insulation tests, hot spot IR scans, etc.
I have done this many times.Years ago we had a similar scenario. The solution was to add double doors on the fence directly across from the transformer primary side along with a written procedure stating the doors had to open during examination or testing.
Not exactly a Code compliant
I have done this many times.
Why would it be prohibited?But this methodology is not listed as an exception correct?
Why would it be prohibited?
Are you thinking because the access doors/gates are barriers that have to be removed? I have not met an AHJ that uses this interpretation.
Why would access doors need an exception?
What assumptions?As thorough as Code is, you’d expect some sort of an exception for ‘access doors’ to mitigate the required working clearances - otherwise it’s based on assumptions.
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What assumptions?
If the doors/gates aren't open you have no access. If you have no access you do not need clearance.
I know many electricians that will put their tools on the floor in front, along side of, or behind them while working on equipment to me this is more of a working clearance issues, than opening access doors/gates.
What service would have to be done to an energized transformer??There are many possible scenarios but I think the intent is to have the access doors closed while working on transformer and still be within the working clearances of Table 110.34.
Having said that, an operating plant would have ‘qualified individuals’ to service the transformer and in my opinion the access doors would be acceptable as long as there is written procedure just to ensure the procedure is followed
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What service would have to be done to an energized transformer??
Not energizedIdeally none. But we know in the real world: hot oil reclamation, electrical testing, and various maintenance and repair procedures could happen
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Not energized
Different than any transformer I've seen.I’ve seen transformers opened for examination while energized.
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Thermal scans of connections while under load would have to be done while energized.Different than any transformer I've seen.
dry type?
Yes and viewing/scanning windows make this possible without exposure.Thermal scans of connections while under load would have to be done while energized.
They do, but not on the millions of existing transformers without them.Yes and viewing/scanning windows make this possible without exposure.
All of which do not have working clearance issues brought up by the OPThey do, but not on the millions of existing transformers without them.
