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Pulling Meters? #148830
05/02/03 01:57 AM
05/02/03 01:57 AM
Trumpy  Offline
OP
Member
Joined: Jul 2002
Posts: 8,231
SI,New Zealand
Regarding Mark's(marktlm123) comments about PoCo employees recieving shocks when removing meters to isolate installations.
Is this a recognised practice(removing the meter)?.
I would have thought that there would be a fuse or some other device, on the Line- side of the meter, to do this(isolate the installation) in a safer way?.


[This message has been edited by Trumpy (edited 05-02-2003).]

Arc Flash PPE Clothing, LOTO & Insulated Tools
Re: Pulling Meters? #148831
05/02/03 05:33 AM
05/02/03 05:33 AM
P
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
There's always a main fuse ahead of the meter in the U.K., but then our meters aren't the plug-in type.

Re: Pulling Meters? #148832
05/02/03 02:04 PM
05/02/03 02:04 PM
B
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
Trumpy and Paul — In the US, the norm is called "hot-sequence metering" and has some limitations.

Found at themeterguy web site...
[Linked Image]



[This message has been edited by Bjarney (edited 05-25-2003).]

Re: Pulling Meters? #148833
05/02/03 02:14 PM
05/02/03 02:14 PM
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,888
NY, USA
Several years ago the Utility (POCO) on Long Island changed the Meter Pan requirements to include a Manual Bypass Lever in all new installations including Residential. This allows the meter to be pulled or inserted after the switch is closed without any arcing.

Bill

Re: Pulling Meters? #148834
05/02/03 02:20 PM
05/02/03 02:20 PM
Trumpy  Offline
OP
Member
Joined: Jul 2002
Posts: 8,231
SI,New Zealand
Bjarney,
Thanks for the pic, mate.
You were saying that this system has it's limitations, what are these?.

Re: Pulling Meters? #148835
05/02/03 06:34 PM
05/02/03 06:34 PM
S
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,342
Some OH drops are less intimidating , and easier to deal with than older cruted up meters.

Re: Pulling Meters? #148836
05/02/03 06:48 PM
05/02/03 06:48 PM
I
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
Trumpy, I think the limitations Bjarney is speaking of are those that show in the picture.

Bad things can happen pulling and replacing meters Hot.

As sparky said some times better to cut off the overhead but at some point you will be reconnecting Hot which brings its own problems.

We are finding more utilities going with "cold" sequence(Main ahead of CTs) metering for services above 400 amps.

Oh, if you have not seen the back side of an undamged meter I guess the picture is not much help. The meter shown has a lot of metal missing.

Hopefully the missing metal was not blasted on to any persons.

[This message has been edited by iwire (edited 05-02-2003).]


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Re: Pulling Meters? #148837
05/02/03 08:23 PM
05/02/03 08:23 PM
B
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
iwire, that's a good comment. The left blades in the meter photo represent the load-side three phases, plus the neutral tap on one of the middle stabs—at the lower side of the meter socket when operating. The three melted "nubs" at the right side of the picture were once ‘full-sized’ more like the 8-o’clock blade, and normally connected to the ungrounded line-side phases.

Not having the right PPE—it may have been hard to leave such an incident without copper-plated knuckles and eyebrows {and less-than-tidy underwear.}




[This message has been edited by Bjarney (edited 05-02-2003).]

Re: Pulling Meters? #148838
05/02/03 09:19 PM
05/02/03 09:19 PM
G
ga.sparky56  Offline
Member
Joined: Nov 2002
Posts: 558
young harris georgia usa
How many here will fess up to doing a residential panel change,entrance cable and all,by simply removing the meter, leaving the line side of the meter base hot?

I don't do it any more,but I'm betting others have done it also.

Re: Pulling Meters? #148839
05/02/03 11:19 PM
05/02/03 11:19 PM
M
marktlm123  Offline
Junior Member
Joined: Apr 2003
Posts: 8
Oakland, NJ USA
With these meters it's commom for about 5 houses to be on one bucket(tansformer), so if your pulling a meter thats old or has problems you have about 1000 amps plus at 240 behind that and thatb wil hurt you. I think from know on i'll the power company remove the meter, it's there there equipment and they usaly lock it out so let them deal with it.


Mark
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