I'm looking at fitting a digital pumped shower. The unit goes in the
loft and had a wireless remote control. The mixed output goes through a
single pipe into the bathroom below. No electrics in the bathroom

The new shower unit requires connection via a 3A switched (double pole,
3mm gap) fused connection, along with a 30mA RCD somewhere in the
circuit. At present there isn't an RCD fitted to any of the house circuits.

We currently have an old 8.5kW electric shower that will be removed.
It's on a 40A plug-in MCB in old Wylex consumer unit which comes up the
wall cavity into the loft. I would like to re-purpose this radial
circuit for the immersion heater (single, 3kW) which was replaced
previously but never wired up. The previous one plugged into a 13A
socket in the airing cupboard, spurred off somewhere (I presume the
upstairs ring). The plug used to get hot and I didn't like the idea of
it being off the ring. Hence when the shower radial circuit is freed
up, it would make an ideal feed for the immersion heater.

Would it be okay to run the shower off the same radial circuit via a
separate 3A FCU? That circuit is currently running 8.5KW of shower.

As the cable is in the loft and easily accessible, I intend to fit a RCD
(1G box mounted) for the shower outside the bathroom in the landing area
close to the ceiling. This would allow us turn off/reset the shower (in
case of any problems) by 'testing' the RCD - without having to get into
the loft. The switched FCU for the shower would then be close to the
shower unit in the loft, making it clear for person working on it to see
if it's turned off.

I would do something similar for the immersion heater, with it coming
off a 13A FCU mounted on the landing and a boost timer switch (e.g.
http://www.screwfix.com/p/horstmann-...meswitch/67063) to show
when it's actually on.

Should the immersion header be on an RCD too?

I'm trying to avoid having to touch the consumer unit, nor pull any new
cables. Does what I've suggested sound a sensible DIY plan?

Thanks

David

David Hearn wrote:
I'm looking at fitting a digital pumped shower. The unit goes in the
loft and had a wireless remote control. The mixed output goes
through a single pipe into the bathroom below. No electrics in the
bathroom
The new shower unit requires connection via a 3A switched (double
pole, 3mm gap) fused connection, along with a 30mA RCD somewhere in
the circuit. At present there isn't an RCD fitted to any of the house
circuits.
We currently have an old 8.5kW electric shower that will be removed.
It's on a 40A plug-in MCB in old Wylex consumer unit which comes up
the wall cavity into the loft. I would like to re-purpose this radial
circuit for the immersion heater (single, 3kW) which was replaced
previously but never wired up. The previous one plugged into a 13A
socket in the airing cupboard, spurred off somewhere (I presume the
upstairs ring). The plug used to get hot and I didn't like the idea
of it being off the ring. Hence when the shower radial circuit is freed
up, it would make an ideal feed for the immersion heater.

Would it be okay to run the shower off the same radial circuit via a
separate 3A FCU? That circuit is currently running 8.5KW of shower.

Not perfect but it will be safe.


As the cable is in the loft and easily accessible, I intend to fit a
RCD (1G box mounted) for the shower outside the bathroom in the
landing area close to the ceiling. This would allow us turn
off/reset the shower (in case of any problems) by 'testing' the RCD -
without having to get into the loft. The switched FCU for the shower
would then be close to the
shower unit in the loft, making it clear for person working on it to
see if it's turned off.

I would do something similar for the immersion heater, with it coming
off a 13A FCU mounted on the landing and a boost timer switch (e.g.
http://www.screwfix.com/p/horstmann-...meswitch/67063) to
show when it's actually on.

Should the immersion header be on an RCD too?

I'm trying to avoid having to touch the consumer unit, nor pull any
new cables. Does what I've suggested sound a sensible DIY plan?

Sounds OK to me.
--
Adam

On Aug 17, 1:46*pm, David Hearn
wrote:


I'm looking at fitting a digital pumped shower. *The unit goes in the
loft and had a wireless remote control. *The mixed output goes through a
single pipe into the bathroom below. *No electrics in the bathroom

The new shower unit requires connection via a 3A switched (double pole,
3mm gap) fused connection, along with a 30mA RCD somewhere in the
circuit. *At present there isn't an RCD fitted to any of the house circuits.

We currently have an old 8.5kW electric shower that will be removed.
It's on a 40A plug-in MCB in old Wylex consumer unit which comes up the
wall cavity into the loft. *I would like to re-purpose this radial
circuit for the immersion heater (single, 3kW) which was replaced
previously but never wired up. *The previous one plugged into a 13A
socket in the airing cupboard, spurred off somewhere (I presume the
upstairs ring). *The plug used to get hot and I didn't like the idea of
it being off the ring. *Hence when the shower radial circuit is freed
up, it would make an ideal feed for the immersion heater.

Would it be okay to run the shower off the same radial circuit via a
separate 3A FCU? *That circuit is currently running 8.5KW of shower.

As the cable is in the loft and easily accessible, I intend to fit a RCD
(1G box mounted) for the shower outside the bathroom in the landing area
close to the ceiling. *This would allow us turn off/reset the shower (in
case of any problems) by 'testing' the RCD - without having to get into
the loft. *The switched FCU for the shower would then be close to the
shower unit in the loft, making it clear for person working on it to see
if it's turned off.

I would do something similar for the immersion heater, with it coming
off a 13A FCU mounted on the landing and a boost timer switch (e.g.http://www.screwfix.com/p/horstmann-...meswitch/67063) to show
when it's actually on.

Should the immersion header be on an RCD too?

I'm trying to avoid having to touch the consumer unit, nor pull any new
cables. *Does what I've suggested sound a sensible DIY plan?

Thanks

David

All OK. Immersion heater doesn't need an RCD. You could replace the
40A mcb with a 16A.


NT

On 19/08/2012 11:44, NT wrote:
On Aug 17, 1:46 pm, David Hearn
wrote:


I'm looking at fitting a digital pumped shower. The unit goes in the
loft and had a wireless remote control. The mixed output goes through a
single pipe into the bathroom below. No electrics in the bathroom

The new shower unit requires connection via a 3A switched (double pole,
3mm gap) fused connection, along with a 30mA RCD somewhere in the
circuit. At present there isn't an RCD fitted to any of the house circuits.

We currently have an old 8.5kW electric shower that will be removed.
It's on a 40A plug-in MCB in old Wylex consumer unit which comes up the
wall cavity into the loft. I would like to re-purpose this radial
circuit for the immersion heater (single, 3kW) which was replaced
previously but never wired up. The previous one plugged into a 13A
socket in the airing cupboard, spurred off somewhere (I presume the
upstairs ring). The plug used to get hot and I didn't like the idea of
it being off the ring. Hence when the shower radial circuit is freed
up, it would make an ideal feed for the immersion heater.

Would it be okay to run the shower off the same radial circuit via a
separate 3A FCU? That circuit is currently running 8.5KW of shower.

As the cable is in the loft and easily accessible, I intend to fit a RCD
(1G box mounted) for the shower outside the bathroom in the landing area
close to the ceiling. This would allow us turn off/reset the shower (in
case of any problems) by 'testing' the RCD - without having to get into
the loft. The switched FCU for the shower would then be close to the
shower unit in the loft, making it clear for person working on it to see
if it's turned off.

I would do something similar for the immersion heater, with it coming
off a 13A FCU mounted on the landing and a boost timer switch (e.g.http://www.screwfix.com/p/horstmann-...meswitch/67063) to show
when it's actually on.

Should the immersion header be on an RCD too?

I'm trying to avoid having to touch the consumer unit, nor pull any new
cables. Does what I've suggested sound a sensible DIY plan?

Thanks

David

All OK. Immersion heater doesn't need an RCD. You could replace the
40A mcb with a 16A.

Thanks for the comments - I later checked and realised the shower is
currently on a 32A MCB. I'll look at dropping it to 16A - thanks.

David

On 18/08/2012 13:48, ARWadsworth wrote:
David Hearn wrote:
I'm looking at fitting a digital pumped shower. The unit goes in the
loft and had a wireless remote control. The mixed output goes
through a single pipe into the bathroom below. No electrics in the
bathroom
The new shower unit requires connection via a 3A switched (double
pole, 3mm gap) fused connection, along with a 30mA RCD somewhere in
the circuit. At present there isn't an RCD fitted to any of the house
circuits.
We currently have an old 8.5kW electric shower that will be removed.
It's on a 40A plug-in MCB in old Wylex consumer unit which comes up
the wall cavity into the loft. I would like to re-purpose this radial
circuit for the immersion heater (single, 3kW) which was replaced
previously but never wired up. The previous one plugged into a 13A
socket in the airing cupboard, spurred off somewhere (I presume the
upstairs ring). The plug used to get hot and I didn't like the idea
of it being off the ring. Hence when the shower radial circuit is freed
up, it would make an ideal feed for the immersion heater.

Would it be okay to run the shower off the same radial circuit via a
separate 3A FCU? That circuit is currently running 8.5KW of shower.

Not perfect but it will be safe.


As the cable is in the loft and easily accessible, I intend to fit a
RCD (1G box mounted) for the shower outside the bathroom in the
landing area close to the ceiling. This would allow us turn
off/reset the shower (in case of any problems) by 'testing' the RCD -
without having to get into the loft. The switched FCU for the shower
would then be close to the
shower unit in the loft, making it clear for person working on it to
see if it's turned off.

I would do something similar for the immersion heater, with it coming
off a 13A FCU mounted on the landing and a boost timer switch (e.g.
http://www.screwfix.com/p/horstmann-...meswitch/67063) to
show when it's actually on.

Should the immersion header be on an RCD too?

I'm trying to avoid having to touch the consumer unit, nor pull any
new cables. Does what I've suggested sound a sensible DIY plan?

Sounds OK to me.


Thanks for the comments.

D