Fuse holder at meter

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hard-work said:
So how does this meter operate?
Click to expand...

The clue could be in the label on the meter

upload_2019-5-31_13-34-8.png


0000/0700 GMT could mean the meter operates lower rate between those times and when on Low rate the meter puts 230 volts onto the Timer Switched Live to operate a contactor to switch on the supply to Low rate equipment ( storage heaters ). ( time switch being part of the meter )
 
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bernardgreen said:
The clue could be in the label on the meter

View attachment 165268

0000/0700 GMT could mean the meter operates lower rate between those times and when on Low rate the meter puts 230 volts onto the Timer Switched Live to operate a contactor to switch on the supply to Low rate equipment ( storage heaters ). ( time switch being part of the meter )
Click to expand...
You are describing two timers. One inside the meter.
 
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hard-work said:
You are describing two timers. One inside the meter.
Click to expand...
I don't think he was. I think he was talking about just one timer ('in the meter') with the feed from that once operating an external contactor to switch 'low rate equipment'' (e.g. heating) on during the cheap hours.

Kind Regards, John
 
IIRC the timeswitch supply is a permanent live, just intended to run an electric clock. Observe the cable is much smaller than the others. It's fused to prevent you tapping it and running your house off it. The timeswitch would have turned the supply to the storage heaters on and off.

When I look at your pictures I think the timewswitch is, or was, in the black plastic box top left. Doesn't it have a window to look at the dial? It doesn't look to me like a teleswitch case.

harlow-meter-4-jpeg.165245
 
I agree.

I think the black box is a timeswitch with two sets on contacts. The main contacts will be 100A rated & will directly switch the storage heater load. The aux contacts are generally rated around 2A and will supply the rate changing input to the meter. Incidentally, meters generally require a switched neutral to change the rate. This is another anti-abstraction precaution since tapping this switch wire cant provide any power, the worst that can happen is that the meter stays in low rate.
 
As I am unfamiliar with these E7 meters, if there is only a L&N into the meter and an L&N out, with all the other cables removed inc' the fuse holder, it should act a normal meter?
 
Last edited:
Ok Guys, Hear's some help with this one.. The fuse holder is fed from (unmetered) cut-out, there is a 4A fuse fitted to protect the External time switch/Teleswitch/Contactor (if fitted). The Ampy Reporter has its own internal time switch, which is pre programmed at factory via the IR ports on front (in steel ring). This one is set to E7 using 00:00 to 07:00 (GMT) a common but not unique time. There are 2 small connection points on bottom (Dry contacts). This is where the Contactor is switched from at E7 times, the Rate on meter changes accordingly to Low. The contactor shown is as you can see a SP 100A. It too has its own 3A fuse internally (if used). The meter is unlikley to be reprogrammed on site, so if a customer does not want or need to be on E7 the supplier will just add Norm & Low readings together. All this gear is the property of the supplier/DNO so NO touchy!
 
The contactor is the DNO's property? Will the DNO remove this junk?
 
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