Mike Dolt Enterprises
Mike Dolt Enterprises
User: DRZ400, Location: Seattle, WA
Asked on: Monday, April 4, 2011 at 8:29 pm EDT
Answered on: Tuesday, May 14, 2024 at 3:46 am EDT
Question: NEC 503.10 Indicates that use of EMT is acceptable. However I'm finding it difficult to find a manufacture that makes connectors and coupling that are listed for Class III use. Anyone know of a brand?NEC 503.145 The previous electrical contractor on this project used standard 4/S box's with raised industrial cover for all receptacles. The previous contractor never permitted the lob or had the job inspected. We are now re-installing the entire project to code however I am unsure if the existing receptacles will be acceptable under the exception in 503.145. Has anyone run across this issue and what was the outcome?THXDRZ400
EMT Connectors and Couplings Listed for Class III Use Appleton (Item numbers: EMB10, EMB10G, EMB20, EMB20G, EMB30, EMB30G, EMB40, EMB40G) Thomas & Betts (Item numbers: C3211-A, C3211-GA, C3212-A, C3212-GA, C3213-A, C3213-GA, C3214-A, C3214-GA)4/S Boxes with Raised Industrial Covers for Receptacles
The exception in NEC 503.145 states that standard boxes and covers may be used for receptacles in Class III hazardous locations if they meet the following conditions: The boxes are suitable for the environment and are permanently installed. The covers are weatherproof and have overlapping edges.* The receptacles are of the isolated ground type or are otherwise protected against grounding faults.Based on your description, it appears that the existing receptacles in standard 4/S boxes with raised industrial covers may be acceptable if they meet the conditions outlined above. It would be prudent to consult with a qualified electrician or local AHJ to confirm their acceptability. Flag for review