petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- Semi-retired 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.
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.
