[time-nuts] Three Phase Power

Rob Kimberley rk at timing-consultants.com
Tue Jun 28 07:24:26 UTC 2011

I remember experimenting as a kid, running small low voltage bulbs of the
earth and neutral lines in our house.

Rob K

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Jason Rabel
Sent: 27 June 2011 9:38 PM
To: time-nuts at febo.com
Subject: Re: [time-nuts] Three Phase Power

Will & Bill,

Our (commercial) three phase power is fed by only two high-voltage wires
(7,200v I think) which each pole has a pair of transformers. I can only
assume one generates the 220v single phase lines and the other is the
high-leg delta. Around here 230v three phase delta seems to be more common
than 208v Y style.

I remember a couple years ago we had a transformer die (thankfully it was a
passive failure and not a massive fireball on the pole).
People were wondering why their machines weren't working (but the lights
were on)... Sure enough hooking up a meter and the high leg was dead...

I did read somewhere that this change might have an effect on demand meters?
There was no further explanation unfortunately, but that does kind of worry
me as I know about 90% of the meters on our property are that style. The
power company just loves to tack on a "demand charge" to the bill, which can
often double, or triple the cost of your electric... Just because you want
to have the lights on, A/C running, and an air-compressor... :(

I've never seen or heard of anyone here in Houston with three phase
residential (except for farmers, but I guess they are commercial).

Centerpoint Energy has reached the epitome of laziness and is converting
everyone over to "smart meters" so people can better monitor their usage...
In reality it does nothing more than offer real-time monitoring for the
power company, and they no longer have a use for meter-readers...

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