NEMA enclosure type 1A?
- Thread starter zxfabb
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- San Francisco Bay Area, CA, USA
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- Electrical Engineer
Old designation meaning that although type 1 rating is all they claim, it has a gasket on the door, originally just to keep the door from rattling under vibration.
In the MCC world it still exists, but with most mfrs it's now called NEMA 1-G, G for Gasketed. It's that way in MCCs because they only make one unit door type for type 1 and 12, but if you order a NEMA 12 MCC, the other covers are gasketed too, plus the joints are sealed. They changed it from 1A to 1-G because there is also a NEMA type 1A wiring method for MCCs, and people got confused.
In the MCC world it still exists, but with most mfrs it's now called NEMA 1-G, G for Gasketed. It's that way in MCCs because they only make one unit door type for type 1 and 12, but if you order a NEMA 12 MCC, the other covers are gasketed too, plus the joints are sealed. They changed it from 1A to 1-G because there is also a NEMA type 1A wiring method for MCCs, and people got confused.
NEMA1a is semi dust proof. It is somewhat of a gasketed enclose which does not meet NEMA requirements which is dust proof. There are NEMA standard enclosure requirements which enclusured of various types are required to meet. But I am not aware of any testing that NEMA 1a is required to meet. Matter of fact I done believe that NEMA 1a is really not recognized by NEMA as an enclosure type.
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