MichaelGP3
Senior Member
- Location
- San Francisco bay area
- Occupation
- Fire Alarm Technician
Electrical contractor installs a 24 volt, 3 or 5 amp (not sure) DC power supply used for HVAC controls (fed by 120 volt AC) in a 15" x 15" x 4" NEMA 1 enclosure in an electrical room, no battery charger present. AC in on one conduit, DC out on another. Enclosure is not sourced from the power supply manufacturer; power supply occupies @ 20-25% of the enclosure's volume. Does this enclosure need to be vented? I asked the EC and he doesn't know. I don't either.