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

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Re: Basic power quality methodology [Re: Jerry5565] #185765
03/26/09 01:17 PM
03/26/09 01:17 PM
S
SteveFehr  Offline
Member
Joined: Mar 2005
Posts: 1,213
Chesapeake, VA
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
03/27/09 11:19 AM
J
JBD  Offline
Member
Joined: Jul 2001
Posts: 599
WI, USA
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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