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Can a viewing window be field installed on a safety switch by ordering a replacement cover with the viewing window provided in the replacement cover?

Issue:
Product feature

Product Line:
Safety Switch

Environment:
Special feature

Cause:
Field modification

Resolution:
No, a replacement cover cannot be provided due to UL marking issues. A new switch could be provided with a factory installed viewing window provided in the cover. The exceptions would be NEMA 4X Polyester switches and NEMA 7/9 Hazardous Location switches. 
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