Day Night meters

[johnnyjb]

Hi i was just wondering could any body shine a light on a query i have regarding the dual rate meters.

Ive recently seen a meter room for apartments and was looking at the arrangement. Obviously enough there is the live neutral going through the day night meter but ther is also 3 x 1.5 mm singles coming from meter into the storage heating timeclock.

My main question is what are all 3 singles for. I assume there is a live neutral and would the 3rd core be to switch the meter to night when the time clock kicks in (like a contactor), also the control pair going to the apartments are there to but understand that side of it.

Am i wrong about the switch wire to the meter ,i dont know much about day night meters. Thanks

 

[johnnyjb]

Any body got an answer for me?

 

[Lectrician]

The three small DI cables are live and neutral to supply the teleswitch or clock. The third is a switch wire to pull then meter into low rate. It is a switch neutral (if you connected this cable to neutral the meter would drop to low rate).

 

[johnnyjb]

Thanks Lectrician Is there any specific reason why it is a neutral being switched

 

[Steve]

Its not switching a neutral, its pulling a terminal in the meter to 0 volts (by connecting the neutral to it) which triggers the night rate.

I guess.

There is no danger as your question implies, as there is never any load on the neutral or the terminal in the meter, it is simply a signalling system.