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Here is a picture of a 1600 amp transfer switch that was wired a little too neatly.

How it ever got past an inspector is way beyond me! Luckily the load is no where near capacity and nothing has gotten hot – yet!

[Linked Image]

There are two identical transfer switches side by side wired the same way nearby in San Jose.

One is for HVAC, and the other for the UPS, DC plants and other technical loads. The transfer switches, and switchgear were installed with a permit and inspected by the city.

The site manager tells me that the electrician that installed it now is an instructor at a junior college, and wanted to bring his class to the site to see the installation!

I am presently trying to figure out a way to wire them correctly, and keep the site on line at the same time.

Gregg

Joe Tedesco, NEC Consultant