110.58 indicates a disconnecting means for transformers and motors to be within sight, I have a design where the transformer primary OCPD is located in a switchboard in the main electrical room and the xfmr. in a third floor electrical room, I was informed by the designer that if the OCPD is lockable than a local disc. sw. is not required at the transformer primary on third floor but could not find the exception in the code any idea where it might be??
110.58
- Thread starter Mike01
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- Connecticut
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110.58 applies to "Tunnel Installations over 600V, Nominal." It does not sound like this applies to your installation.
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- Lockport, IL
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- Retired Electrical Engineer
You can't find an exception because there is no rule to which an exception is needed. Having a disconnect that is local to (i.e., within sight of) a transformer might be a good idea, in that it might make the job of a future maintenance person easier. But it is not a code requirement.
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