2 cooker 1 switch

[tom1]

20 amp oven and 45 amp hob, and socket am i right in thinking 31.5 amps or is it 34.5 amps

and is it ok off 1 switch or do they both need isolating

 

[Lurch]

20 amp oven and 45 amp hob, and socket am i right in thinking 31.5 amps or is it 34.5 amps

Something not right there, you lost your calculator?

 

[tom1]

Something not right there, you lost your calculator?

its a bit late

what do u make it

 

[spinlondon]

If you want to calculate for diversity, you could combine the two appliances as they will be fed from the single switch, and the formula for diversity assumes a single appliance would contain both oven and hob.

10 Amps + 30% of 55Amps = 26.5 Amps.

If you calculate them separatly, you will get 33.5Amps.

 

[tom1]

so with socket it is 31.5 amp with socket.

 

[SPECIAL LOCATION]

20 amp oven and 45 amp hob, and socket am i right in thinking 31.5 amps or is it 34.5 ampsand is it ok off 1 switch or do they both need isolating

Just to confirm for any others reading where some of these calcy bits come from....

Page 160 On Site Guide. Appendix 8

8.4 Cooker circuits in household & similar premises

general comment:

a 30 or 32 amp circuit is usually appropriate for household or similar cookers up to a rating of 15kW

20A + 45A = 65A x 230v = 14950watts (upto 15kW )

OR Diversity calcs:-

Appendix 1 Page 96 On Site Guide.

First 10A

+ 30% of remainder

+ 5A if a socket outlet included.

so 10A + (0.3 x 55A) + 5A = 31.5Amps

so 26.5 if no socket, 31.5 with socket.



Switching:-

The guidance on Page 160 states a circuit between 15A and 50A may supply TWO or MORE cooking appliances providing they are in the same room.

One switch can supply two appliances providing its is no more than 2m form both appliances.

 

[SPECIAL LOCATION]

Something not right there, you lost your calculator?

Well thats a helpful and informative statement? :|

I am so pleased to be in your presence oh wonderful wise one..Pray

We are NOT worthy................................

Hardly worth you taking the time and effort out of your busy schedule to add that Gem from your knowledge base.

But thank you VERY VERY much for your insightful help on this topic!

So I shall go back now and sit in me corner thinking to myself...

Maybe Mr Lurch is an Expert in CCTV but not expert in Cookers...

mumbling on like and old git.....

Oh there is a post-it note reminder on me desk... ...

I must ring Deke again to ask if I can borrow the turquoise Stockings.....Blushing

And see if Andy will lend me the Crayon box again...

must finish this colouring book...

Only got the Christmas tree to colour now!!!

:coat :coat

Blushing

Blushing

 

[tom1]

thanks for confirming the current circuit is 6mm 32 mcb and that's how it will stay

 

[tom1]

ROTFWL

i do dot to dot and then colour as i am a big boy now

 

[Bez]

Just to confirm for any others reading where some of these calcy bits come from....Page 160 On Site Guide. Appendix 8

8.4 Cooker circuits in household & similar premises

general comment:

a 30 or 32 amp circuit is usually appropriate for household or similar cookers up to a rating of 15kW

20A + 45A = 65A x 230v = 14950watts (upto 15kW )

OR Diversity calcs:-

Appendix 1 Page 96 On Site Guide.

First 10A

+ 30% of remainder

+ 5A if a socket outlet included.

so 10A + (0.3 x 55A) + 5A = 31.5Amps

so 26.5 if no socket, 31.5 with socket.



Switching:-

The guidance on Page 160 states a circuit between 15A and 50A may supply TWO or MORE cooking appliances providing they are in the same room.

One switch can supply two appliances providing its is no more than 2m form both appliances.

Many thanks for explaining that in plain english, I sort of knew already but it's nice to see it confirmed, and also the more times you read these things, the more they stick.

Very informative postApplaud Smiley

 

[Bez]

Something not right there, you lost your calculator?

Very un-informative postApplaud Smiley

 

[Lurch]

Well thats a helpful and informative statement? :| I am so pleased to be in your presence oh wonderful wise one..Pray

We are NOT worthy................................

Cheers.

If you've got some sort of problem feel free to say something.

 

[tom1]

i prob should have exlplained better but it was late and i was on my phone, i always went on first 10 amps + 30% of the remainder as on osg pg 96.

on pg 97 its less clear and says 10a + 30% of full load which could imply 10a and 30% of the full load, it being late i thought i would include it in my question about one switch for both as i was not sure weather to add them together and apply diversity or diversity first then add them.

so getting back to the point i prob should have put the cooker calculation in my first post

 

[Lurch]

Yeah, I worked that out earlier, last night it made no sense!

As for the isolation, I would always isolate each device individually. I'm fairly certain it says as much in the regs somewhere, good practice anyway. If you use the existing cooker control then I'd add 2 isolators in an adjacent cupboard.

 

[Evans Electric]

Specs , have you been injecting drain cleaner again ?

Turquoise stockings !!! Wouldn't be seen dead in 'em.

 

[tom1]

prob would be better with 2 switch but regs say 1 switch is ok

the main thing i needed to know is that u add the 2 appliances together then apply diversity

 

[SPECIAL LOCATION]

Yeah, I worked that out earlier, last night it made no sense!As for the isolation, I would always isolate each device individually. I'm fairly certain it says as much in the regs somewhere, good practice anyway. If you use the existing cooker control then I'd add 2 isolators in an adjacent cupboard.

Incorrect info!

try Page 160 one site guide....

(which complies with Regs & is good practice! )

One switch can supply two appliances providing its is no more than 2m form both appliances.

 

[batty]

Incorrect info!try Page 160 one site guide....

(which complies with Regs & is good practice! )

One switch can supply two appliances providing its is no more than 2m form both appliances.

Can't see problem with that no different to having one cooker only time may switch them separately if it was a really high current being drawn.

 

[Lurch]

One switch can supply two appliances providing its is no more than 2m form both appliances.

Fair enough. I'd still isolate each one individually though.

 

[SPECIAL LOCATION]

Fair enough. I'd still isolate each one individually though.

Valid point and where feasible its obviously a more comprehensive solution to isolating either of the appliances...Applaud Smiley

But if push comes to shove, you are not going against BS7671 guidance if you do have to use a single switch. :|

Tis ye ode balance of..

Preferred option -vs- Cost effective feasible option -vs- Complying with the regs.