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Basic power quality methodology #185757 03/26/09 09:29 AM
Joined: Mar 2009
Posts: 4
J
Jerry5565 Offline OP
New Member
Basic power quality methodology

The more advanced that electronic equipment becomes, the more dependent it is on clean power. I ran into a good reference source on troubleshooting power quality problems. It explains basic procedures such as creating a current one-line, doing a walk around, and keeping an incident log. It's worth checking out ...

Basic power quality methodology

Work Gear for Electricians and the Trades
Re: Basic power quality methodology [Re: Jerry5565] #185765 03/26/09 01:17 PM
Joined: Mar 2005
Posts: 1,213
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SteveFehr Offline
Member
Jerry, thanks, this is a great reminder that all those codes everyone ignores, like NFPA 70B, 110, 111, etc... If you actually DO all that recommended and required maintenance and record keeping, you saving money in the long run!

Grounding is incredible important, as well. Traditional NEC grounding methods are fine for safety, but just plain suck at grounding modern electronic equipment. Long pieces of copper wire back to a ground rod might as well be an open circuit to the EMI in a modern datacenter. Supplemental ground systems, equipotential planes, and other methods are required to shunt the noise to ground. It's counterintuitive, but grounding equipment to the metal grid of a raised deck floor is actually far more effective than a wire straight down to a ground rod, because at those frequencies, the capacitance between the raised deck and the earth is a lower impedance than the inductor a straight piece of cable turns into.

Re: Basic power quality methodology [Re: SteveFehr] #185789 03/27/09 11:19 AM
Joined: Jul 2001
Posts: 599
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JBD Offline
Member
Connection to dirt is not important in noise control. It is the bonding of all surfaces into an equi-potential plane that is important. IMHO we should stop using the word 'grounding' when we mean is 'bonding'.


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