Tweakers' Asylum

Don't.

67.174.215.160

cdb

A

In Reply to: RE: voltage drops question posted by sanman on August 28, 2012 at 16:47:52

96VAC on a (unloaded) residential branch circuit is below spec. Your friend has either some crap wiring, an off-spec service drop, or both.

Either the back of the amp by the power source or certainly the owners manual will have listed the voltage 'spread' the device can operate at.

All this is governed by ANSI C84.1.

See linky below for my utility's explanation.
http://www.pge.com/includes/docs/pdfs/mybusiness/customerser (Open in New Window)

Follow Ups:

Utilities are - unclestu 14:00:15 08/29/12 (2)
required to provide AC voltage +/- 10% of the nominal 120 VAC at the meter of the home. If not, they may be liable for any damages. When my voltage (commercial) was measured at 105VAC, the local utility came within 45 minutes to measure and although the voltage had risen to about 109VAC, they came back with a crew later on that night to up the voltage (switch transformer taps). They did NOT want to be liable for any damages.

Stu

Edits: 08/29/12 08/29/12
- RE: Utilities are - jea48 15:27:26 08/29/12 (0)
  Hi stu,
  Just guessing the meter for the Op's friends cabin is more than likely mounted on a power pole several hundred feet from the cabin in the woods.
  Again just guessing the power line from the main disconnect, below the meter setting, was not sized properly for VD, voltage drop.
  NEC only recommends VD be considered when calculating the size of a conductor.
  Again just guessing about the power line feeding the cabin.
  Best thing the Op could do is measure the voltage at the cabin with a volt meter with everything powered up in the cabin.
  Unloaded then loaded....
  Jim
  
  Edits: 08/29/12 08/29/12
- RE: Utilities are - cdb 15:18:41 08/29/12 (0)
  The ANSI spec they follow is (now) +/- 5% of 120VAC baseline.
  
  There is a 2011 Rev to that spec, but since nothing is free anymore, ANSI wants $66 for it. 'Prolly has an expanded computer power section, or maybe the baseline has been bumped to 125V. I don't know.

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