Models 4200H and 4700H have been tested and approved by Underwriters Laboratories for use in hazardous locations for:
- Class I Div. I Groups C & D. Unit must be installed in accordance with article 501-4 (A) N.E.C. 1993. Class I Div.
- Groups A, B, C & D. Unit to be mounted in a suitable enclosure and wiring to be installed in accordance with article 501-4 (B) N.E.C. 1993.