| "We wish to compliment you on the excellent report rendered for the subject plant. The existing and additional new facilities were clearly presented. The breadth of data developed was extensive. And finally, the over-all organization and presentation of data was both practical and attractive. Many thanks."
Leo Fyer, Sr. E.E.
Alvarado Water Filtration Plant |
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Seattle Office
16122 SE 266th Street
Covington, WA 98042
(253) 639-8535 P.
(253) 639-8685 F.
Fuhr@PowerStudies.com
San Francisco Office
2400 Third Street
San Francisco, CA 94107
(415) 828-0529
Fuhr@PowerStudies.com |
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Douglas County PUD, Grocery Store Electronic Ballast High Failure Rate
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| Douglas County PUD is a PUD utility organization serving Douglas County Washington. One of their customers reported an extremely high failure rate of electronic ballast. The PUD ask Power Systems Engineering to investigate this problem.
The Power Systems Engineering engineer performed a power quality site survey at the store. The engineer determined that ballasts were failing because of improper and inadequate grounding of the light fixtures. Electronic ballasts were grounded via a flex conduit without a supplemental grounding conductor. The lighting circuits did not have a supplemental grounding conductor pulled in along with the phase conductors. The distribution system conduit was EMT with setscrew couplings. Many of these couplings were loose.
The engineer recommended that a supplemental grounding conductor be pulled in each lighting circuit and bonded to each fixture. He also recommended that the coupling setscrews be tightened on each lighting circuit.
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| Project Information |
| Project |
Grocery Store Electronic Ballast High Failure Rate |
| Client |
Douglas County PUD -East Wenatchee, Washington |
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