cooker isolation

[xanderfh]

I've got to quote for 4 x single phase ovens to be connected to a single isolation point then run back to a single phase db, assumed each oven/ hob is 40a max (no spec yet) any one done this before? What isolator would you suggest I use (200a?) and mcb at db ? Cable size would be >25mm!!

 

[Octopus]

Maybe you should recommend a different, and more practical solution?

 

[babylonsBurning]

Think it would be better if you used a DB in the location of the ovens fed via submain from original DB, put 4 separate breakers in for the supplies, and then separate local isolation for the ovens, others on this forum have argued that a DB can be considered a point of isolation. Loads of issues with having 4 circuits connected to one isolator!!!

 

[telectrix]

agree ^^^^^.

 

[Engineer54]

Are they single ovens (ie supplied with a plug top) or oven and hobs??

As the electrician, it should be you advising the customer on how these ovens etc should be installed, not the other way round!!

 

[Octopus]

Reminds me of the recent thread where the client wanted a switch by their front door to turn off ALL the lights!

 

[infinity]

Easy, light switch controlling a contractor that kills the supply to the lights

 

[lauriehurman]

"light switch controlling a contractor"
That'll do it

 

[thomas-1981]

What size is the main fuse on the cut out?

 

[xanderfh]

Many thanks for the replies I think the best solution would be an additional db in the kitchen, using a contactor sounds do-able with an emergency push switch. The main contractor is mitie so they don't give a s*** how its done, they just want it done !! No spec on the ovens yet, so just working out options at moment

 

[keniff]

"light switch controlling a contractor"
That'll do it

Yeah a light switch that turns on a neon next to the fuseboard so then the contractor knows to turn off the mcb to the lights I think that might be expensive to get a contractor there on day rate for the rest of his/her life though

 

[Engineer54]

Many thanks for the replies I think the best solution would be an additional db in the kitchen, using a contactor sounds do-able with an emergency push switch. The main contractor is mitie so they don't give a s*** how its done, they just want it done !! No spec on the ovens yet, so just working out options at moment

What and where is this installation to be installed?? I'm taking it that this is in a commercial premises??

Rule #1 never allow the client/customer to dictate the design etc of an electrical installation!! If they insist, walk away and let another Mug take on the responsibility!!

 

[R G]

I have done this before in a school cookery class room , what we did was install 28 cookers on their own 40 amp isolators beside each cooker to give local isolation , and then at each end of the class room an emergency stop connected in series to an to a contactor controling all cookers and socket outlets in the room , but not the lighting , so the same could be done on its own dis board for the cookers , no problem

 

[xanderfh]

I think it's for some sort of care unit to teach them how to cook?? I think as ray said using contactor's is the solution (there's no lighting involved, think the thread has gone off on a tangent )

 

[i=p/u]

db for cookers and contactor on the tails controlled by em stop start with idicator maybe a key to turn back on.. as for ratings of devices