Hi Angleburt,
I've done many similar projects. Make a sketch of your control panel and show the location and size of all the conduit entries you'll need. Send it to the explosionproof enclosure makers (their distributors will forward). Appleton, Crouse-Hinds, Killark, and my favorite, Akron Electric.
They'll return a quote to make you a NEMA 7 box for your purpose.
Be careful with the installation. Bolt torques need to be even and according to specs. Don't let the polished flange faces get scratched -- the gap is designed to dissipate heat from an internal explosion, cooling escaping gases to a level that won't ignite anything outside. A good scratch can nullify the rating.
Be careful about moving toward intrinsically safe classification. All devices in your panel would have to be listed (except simple things like RTDs and switches) and protected with barriers. You'd likely have to change every part...
Let us know how it goes for you!
Good on ya,
Goober Dave |
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