Re: incandescent bulbs, short life. Voltage problem?
Originally posted by jimwalker:
POCO do have what i believe is plus or minus 10 volts.
Am thinking this allowed as low as 110 to high as 130 .I might be off on those numbers so check with local poco.
Jim do you read the posts ahead of yours?
Five hours before your guessing at the voltages supplied by the POCO, Charlie,
The Utility Guy told us what the POCO is general held to.
Originally posted by charlie:
10% seems high to me, are you sure or is this "common knowledge"? We are held to plus or minus 5% of nominal with a few exceptions but never as much as 10%.
Plus 5% of 120 is 126, if you are seeing 130 you should call the POCO.
This is from a POCO web site
Voltage Range
The American National Standard ANSI C84.1(1) establishes nominal voltage ratings and tolerances for 60-hertz (alternating current, AC) electric power systems above 100 volts and through 230, 000 volts. Voltage operating ranges are recommended for two voltage categories:
1) The service voltage, typically the point of connection between utility and customer.
2) The utilization voltage, typically the termination point to equipment.
The utilization voltage range takes into account a voltage drop within the end user?s distribution circuits.
ANSI C84.1 expects equipment to operate at service voltages between 95% to 105% with a utilization voltage range of 87% to 106% (120V to 600V)
Refer to ANSI C84.1 for additional operating voltage ranges.
Service Voltage allowable ranges.
114 to 126 for 120
198 to 218 for 208
228 to 252 for 240
263 to 291 for 277
456 to 504 for 480
Notice they use percentage of voltage, not a certain number of volts.
[ January 27, 2004, 04:41 AM: Message edited by: iwire ]