Voltage levels for Commercial building
Voltage levels for Commercial building
(OP)
I am having to change incandescent lamps out in our lobby about once week. I've considered replacing them with flourescent bulbs but don't want to remove my flags until I understand what is going on and why these bulbs are prematurly burning out.These are bulbs rated at 120 volts single phase. The system is a wye 120/208 3 phase system. The voltage readings at peak load are 124.3/216.7 volts. Does this reading seem to high? What are the +/- voltage limits for this configuration? We have checked all the panels for loose nuetrals and bad connections and everything looks good. Any suggestions would be appreciated.
Thanks
Thanks






RE: Voltage levels for Commercial building
If your supply has a lot of voltage fluctuation the taps are sometimes set high so that the motors have adequate voltage when the supply dips. The other side of the compromise is that when the supply voltage is up, your lights high voltage.
If your supply voltage is stable, have the transformer taps set down.
If you have fluctuating voltage consider putting small auto-transformer booster on your motors and then set your transformer taps down. If most of your motor loads come off one panel, you can boost the voltage of the whole panel with two small boost transformers connected as auto transformers.
yours
RE: Voltage levels for Commercial building
RE: Voltage levels for Commercial building
(1) Service Voltage - point-of-common coupling (PCC) between Customer and Utility. Voltage range of +/- 5%
(2) Utilization Voltage - voltage at line terminal's of utilization equipment (within Customer site). Voltage range of + 4.2%, - 8.3%.
RE: Voltage levels for Commercial building
RE: Voltage levels for Commercial building