Shujinko
Senior Member
I have a project at a University where there was an Observation Dome (OD) installed on the roof of the building for the Astronomy Department. The OD rotates 360 deg. The inspector has cited the NEC saying that the power supply for the motor that rotates the dome has to be listed by a Nationally Recognized Testing Lab (UL listed or equivalent). (NEC 725.121.A.2). The power supply that came with the observation dome has a 120V input & 17V output for the power supply. The AHJ wants a UL listed power supply that doesn't have an adjustable output voltage. The ones that the contractor and design team have found online have adjustable voltage dials, which isn't acceptable to the AHJ. Can anyone recommend a cost effective solution for this issue? A Power Supply that is UL listed, with a set non-adjustable voltage, and cost effective?