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4.4 277 volt lines
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Lighting circuits that use 277 volt lines are common for Off-roadway and
commercial lighting systems. In some cases at night, the supply voltage
may exceed 10% (304.5 volts) over nominal. This is a problem for most multivolt
controls rated 105-305 volts. Consult DTL if you are experiencing control
failure on 277 volt systems. Best solution is to put a peak reading voltmeter
at the luminaire and let it run for a few days. If voltage is ever over
305, it is be the line voltage, not the control at fault. Do not depend
on daytime voltage measurements!
DTL has made special controls rated 250-350 VAC specifically for 277
volt lines that run high.
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Dark To Light | 858 Plain Street, Lab #12 Marshfield,
MA 02050
Customer Service: 800-888-0211, Ext 3935 | Tech Support: 781-319-0634
| Fax: 781-319-0640
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