Touch screen Computer in UL508A cabinet
Touch screen Computer in UL508A cabinet
(OP)
has anyone used a touchscreen inteface in a panel that has been built to the ul508a standard? ant compliance problems? Any help you'd be good at this time.......





RE: Touch screen Computer in UL508A cabinet
RE: Touch screen Computer in UL508A cabinet
1 - Is the device recognized (U with backwards R)
2 - If the touch screen has penetrated the panel, then the touch screen must have a UL penetration rating equal to the enclosure, or the entire enclosure rating must be de-rated to the touch screen rating. In other words, if the panel is a NEMA 4X, then the touchscreen must be rated by UL for NEMA 4X penetration rating, and if no rating then the panel becomes a what, NEMA 1 or something?
If the touchscreen has no UL recognition or listing, then you can still use it if you provide power to the device with certain restrictions. I am not near my 508A book at the moment, but it goes something like this:
Non-UL device must be powered by a power supply double of the required power output (1 amp supply feeding .5 amp load). Also, I think there is a low voltage requirement where you must supply only 30 volts or less to a non-UL device, but I am not sure about that.
If you need more let me know. The offices where I keep that book are closed now and alarmed, tough to get to and I am tired and lazy.
PUMPDESIGNER
RE: Touch screen Computer in UL508A cabinet
If the touch screen IS UL listed or recognized, all this was moot except the enclosure issue.
Quando Omni Flunkus Moritati
RE: Touch screen Computer in UL508A cabinet
PUMPDESIGNER