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UL508a Change

Merry Christmas
petersonra

petersonra

Senior Member
Location
Northern illinois
Occupation
engineer
Those of you who do UL508a panels no doubt know that the listing is only good for ambient temperatures of 5-40 deg C.

I guess they got tired of modifying UL procedures so they made a new provision that you can add a heater, ventilation, or A/C to keep the temperature inside the cabinet between 5 and 40 degree C, or use all components that are listed for the temperature range.

As of yesterday, 20A was added.

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