Shower isolation outside bathroom

[markthespark]

Hello just been to look at a shower install the consumer unit backs on to the wall that the shower is going on so the easiest option would be to fit an isolator below the consumer unit and drill straight through the wall.

Would this be ok to do or will i have to put the isolator outside the bathroom door?

For information its a single story flat no access above or below.
cheers.

 

[davesparks]

what a load of old crap.

to the OP:

perfectly acceptable to site the DP iso where you intend.

Please enlighten me as to why this insult is necessary? My statement that a 45A DP pullcord is the traditional method for providing an isolator for them is borne out by the vast majority of electric showers being installed in this way.

 

[davesparks]

design....

Good point, compromise at 'installation design'?

 

[GLENNSPARK]

Please enlighten me as to why this insult is necessary? My statement that a 45A DP pullcord is the traditional method for providing an isolator for them is borne out by the vast majority of electric showers being installed in this way.

rubbish.

a 45A DP iso...is just that...is it not?

and whether its sited within the location./...or not is neither here nor there....is it not.

 

[combilau]

I really do despair for the state of this once noble trade!

Forget the regs book we are dealing with basic physics! V=I.R P=I.V not 230=I.R or P=Ix230

Installation calculations are carried out using nominal voltage in the absence of any more accurate information.

Power ratings are quoted at a specific voltage, to then use a different voltage in calculations involving that power rating is wrong as the power will be different at a different voltage.

Electric showers are almost universally rated at 240V so you need to use 240V in any calculation relating to their power rating.
So for a 10.5KW shower at 240V we get a current flow of 43.75A
If we did as you suggest and used 230 instead then we would wrongly calculate the current as being 45.7A

To establish the actual current flow at 230V we would need to first work out the impedance of the load (R in the above formulas) then we could work out the power and current at 230V

All of our work is carried out to bs7671 and the calculations in there state 230v is used. It will state in the mi's a 230v rating and 240v rating in kW for the showers.

 

[GLENNSPARK]

All of our work is carried out to bs7671 and the calculations in there state 230v is used. It will state in the mi's a 230v rating and 240v rating in kW for the showers.

i`tl be nearer the 240V mark...i can tell you now...

and may be up towards 245-248.....

use nominals for design....but if installing go for measured....

 

[davesparks]

All of our work is carried out to bs7671 and the calculations in there state 230v is used. It will state in the mi's a 230v rating and 240v rating in kW for the showers.

The formulae in BS7671 do not state 230V they state nominal voltage!

If a 230V rating is available then you can calculate current at 230V yes, but that's not the point here.

 

[dazza1981]

The formulae in BS7671 do not state 230V they state nominal voltage!

If a 230V rating is available then you can calculate current at 230V yes, but that's not the point here.

No the point here is yes crack on with where you are intending to fit the isolator.....simples

 

[davesparks]

rubbish.

a 45A DP iso...is just that...is it not?

and whether its sited within the location./...or not is neither here nor there....is it not.

Yes a 45A DP iso is just that whatever and wherever it is, but that's not the point.

I said that the isolator was traditionally a 45A pullcord type located inside the room, I did not say it had to be done that way or that it should be done that way!

Now please tell me why this is utter crap?

 

[davesparks]

No the point here is yes crack on with where you are intending to fit the isolator.....simples

My point is we have someone posting advice with an apparent lack of knowledge of the basic science of electricity!

 

[markthespark]

Thanks for the replies everyone i really appreciate it.

I am going to put the switch below the new 1 way CU.

How much would you charge for this job?

Henley block tails into 1 way RCD shower unit, fit isolator switch at bottom of CU, drill through wall and install 5m 10mm t&e, mount shower connect and test.

No plumbing work.

cheers

 

[dazza1981]

Thanks for the replies everyone i really appreciate it.

I am going to put the switch below the new 1 way CU.

How much would you charge for this job?

Henley block tails into 1 way RCD shower unit, fit isolator switch at bottom of CU, drill through wall and install 5m 10mm t&e, mount shower connect and test.

No plumbing work.

cheers

Hey come on mate you have to figure some things out for yourself mate..... im not pricing it up for you aswell lol

 

[markthespark]

Haha fancy doing the job for me? I pay really really good price.

Ive worked it out at about £80 for materials and £110 for labour so total of £190. The landlord has already bought the shower.

 

[dazza1981]

Haha fancy doing the job for me? I pay really really good price.

Ive worked it out at about £80 for materials and £110 for labour so total of £190. The landlord has already bought the shower.

Jobs a gooden !!!!!

 

[GLENNSPARK]

Yes a 45A DP iso is just that whatever and wherever it is, but that's not the point.

I said that the isolator was traditionally a 45A pullcord type located inside the room, I did not say it had to be done that way or that it should be done that way!

Now please tell me why this is utter crap?

but by saying traditionally it could be seen as implying that it should be....

dont forget...theres some in here lookin on that shouldn`t be installing at all....given some of what we see posted up in here from them.....you dont want to give them the wrong impression...do you...

 

[stevethesparks]

Thanks for the replies everyone i really appreciate it.

I am going to put the switch below the new 1 way CU.

How much would you charge for this job?

Henley block tails into 1 way RCD shower unit, fit isolator switch at bottom of CU, drill through wall and install 5m 10mm t&e, mount shower connect and test.

No plumbing work.

cheers

A bit pointless then really.