Problem Econ 7

[bigd]

6 Econ 7 storage heaters in an old local authority flat. Each heater supplied from its own individual 20A MCB in a Wylex fuse board. 4 of the heaters work. 2 have suddenly stopped working as there is no 230v supply to these heaters.

Checked at the board and each MCB has a 230v supply? Econ 7 supply OK and working between 0200-0700

There is an Enbray contactor fitted to the system. This is not something I've come across before and could it be fitted 'downstream' of the MCBs?

Could this be the issue and, if so, is this the DNOs equipment?

 

[Darkwood]

I did go to the flat at night! 5am this morning as its just next door on my way to work. What a bunch of cynics!

Never expected the contactors to be in circuit downstream of the MCB. Not something I've come across before in a domestic. I guess I expected the contactor to be energising the Econ 7 board. Sticking my head above the parapet why is it done this way? All the other E7 I've done have been fuse board fed direct off the tele switch tails.

I shall go back during the day and do some R1+R2's back to the contactor and the board!!

Can we tone down the attitude please, in reading through the thread I too would have asked you to confirm you went to test these voltages at these obscure hours as it would be out of the normal service of your average sparky and/or the customer, routine dead tests on the cables would be the normal early checks to confirm circuits are sound where off-peak supplies are concerned and this itself would have shown the cable is interupted between the mcb and load.

 

[Dave OCD]

Just a potentially silly question but did you [the OP] test for supply at the DP switches or the heater terminals ? If you tested at the heater terminals it might be knackered switches as they can/do burn out - particularly on the bigger 3.4kW heaters.