mdsulli
I am installing one of the new 200AMP Nexus whole house transfer switches. The switch is a NEMA 3R encloser but I will be mounting it indoors. I am wondering if there are any issue with drilling holes into the top of the switch to allow the power feeds to enter the top of the switch instead of using the knockouts in the sides or bottom.
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Skip Douglas SkipD
It's OK to make your own holes. However, I strongly suggest the use of knockout punches to make clean holes without a lot of debris getting into the cabinet.

Don't drill into the top of the cabinet with it installed in its mounting position. Mark where the holes need to be, then lay the cabinet flat on a bench so all the debris can be easily dealt with and not fall into the components in the cabinet.

Make sure you meet all codes with your fittings, etc. If you don't understand the applicable codes, I strongly suggest that you hire a competent licensed electrician - preferably one who has done several generator installations - to take charge of the job. You could work it out with the electrician so that you become a "helper" (as I did) to save cost. Have the electrician take out the permit and be the responsible person for the inspection.
Skip Douglas
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Ira
Don't know about the Nexus ATS, but when my RTSE200 was installed, I think I recall the installer/electrician pulled the "guts" out of the enclosure before punching any holes. I think there were only a few screws holding it in place, maybe one on each corner.
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mdsulli
Thanks for the advice will certainly be carefull not to allow and debris to remian in the cabinet.
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