Thread: How to measure the power clients are 'actually' using???

looks like 06.1 / 0.6

I've had times when I've thought aha, clamp meter is spot on and then the same clamp meter used in exactly the same way gives a wildly different reading.

I know of a DC that gives you power readings based on clamp meters... they once said "we need to talk to you as you are pulling 32 amps in cab XXX". It transpired they were using a clamp meter and it was nothing of the sort... around 12 amps. To this day they still use clamp meters for all readings I believe :-S

Originally Posted by Peter_connetu

looks like 06.1 / 0.6

It wasn't - it is 0.61 and 000.6 respectively

Originally Posted by markcastle

I've had times when I've thought aha, clamp meter is spot on and then the same clamp meter used in exactly the same way gives a wildly different reading.

I know of a DC that gives you power readings based on clamp meters... they once said "we need to talk to you as you are pulling 32 amps in cab XXX". It transpired they were using a clamp meter and it was nothing of the sort... around 12 amps. To this day they still use clamp meters for all readings I believe :-S

Full racks are measured at the breakers on the DIS board - we don't use multi-core clamp meters for these. I agree, they aren't 100% but they are a start for 10 when you can't disconnect a server...

It wasn't - it is 0.61 and 000.6 respectively

apologies that's what I meant...

I've always hated clampers!

Originally Posted by suhailc

I've always hated clampers!

Stay away from those Double Yellow Lines

P=IV
kw = AmpsxVoltage

If you can access the wires before the go in the outlet, like the j-box or something, you can clamp the "hot" wire.

Already been said above chap

As an aside... for anyone looking to do this in offices or retro fit to your data centre have a chat with MeasureMyEnergy

Run by someone who understands our industry quite acutely!

For those interested we had a custom horizontal PDU designed for us by a local manufacture it has 48 x C13 sockets max input of 32 amp single phase 240v.

Each c13 socket within the PDU is metered with power consumption data stored in flash memory on the PDU which can be accessed via a web interface or API directly.

We poll each socket every 3 seconds and bill the customer in kwh for actual power consumed.

We also monitor each single phase breaker within the distribution board via branch monitoring and breaker monitoring on any 3 phase breaker.

edited.. that would teach me to be on the internet late Friday night... and not re read what i type...

Kindest Regards
James

Originally Posted by micron21

For those interested we had a customer horizontal PDU designed for us it has 48 x C13 sockets on it total 32 amp single phase 240v with each c13 socket metered with data stored in flash memory on the PDU along with web interface and API.
We poll each socket every 3 seconds and bill the customer in kwh for actual power consumed. If anyone
We also monitor each single phase breaker within the distribution board via branch monitoring and breaker monitoring on any 3 phase breaker.

Kindest Regards
James

Sounds like a nice PDU.

Did part of one of the sentences go missing BTW?

thanks for the heads up... all fixed ;-)