Cooker

[Young & Keen]

I am installing a cooker in a commercial premises and I am new to installations and trying to use the regs (17th) to do it. I have a 7.9KW oven which is 42m from the dist board. I am trying to calculate Ib whereby I have 16 cables coing out of the board but it is possible to run the cable in a false ceiling away from these. Do I need to use Cg for 16 cables or not?

Also, I am passing through 100mm of insulation in a partition, do I need to use Ci for 100mm? The reason I am asking is the calculations have resulted in me requiring a 50mm cable which of course is impossible.

I also understand that I will need a C40A RCBO as the board is not RCD protected? I hope I am not too far off the mark.

Please help!!

 

[Young & Keen]

I know that you're young and keen, but are you suitably trained to carry out this kind of work?

Well, you may be able to help me with that. I trained originally as an Electrical Maintenance Engineer and did my 4-year apprenticeship at college. Since then I have worked alongside Installation sparks and even worked overseas in construction. As far as the practical work goes, I am fully competent. I have just completed my 17th Edition and I due to start my 2394/2395 in January. Do you know what else I need to do to be fully qualified without doing 2-4 years at college in installation?

 

[KAS1]

Check out the JIB website for requirements

- - - Updated - - -

That's the only card worth having IMO

 

[Spoon]

Thanks a lot mate. Can diversity be applied to all installations? If so, is it the same formula?

Do you have a copy of the On-Site Guide? There is a section on diversity in there. Appendix A.
If you don't then PM me your email address and I will email the section to you. The book is worth getting, its a good little book.

 

[Guitarist]

Well, you may be able to help me with that. I trained originally as an Electrical Maintenance Engineer and did my 4-year apprenticeship at college. Since then I have worked alongside Installation sparks and even worked overseas in construction. As far as the practical work goes, I am fully competent. I have just completed my 17th Edition and I due to start my 2394/2395 in January. Do you know what else I need to do to be fully qualified without doing 2-4 years at college in installation?

I too trained as an electrical maintenance engineer with 4 years at College and all that jazz. What surprises me is that in all that time, you've never heard of diversity. I think you are smiling right now

 

[telectrix]

here. y'are:

 

[Young & Keen]

Do you have a copy of the On-Site Guide? There is a section on diversity in there. Appendix A.
If you don't then PM me your email address and I will email the section to you. The book is worth getting, its a good little book.

I've got it mate, thanks!

 

[Young & Keen]

I too trained as an electrical maintenance engineer with 4 years at College and all that jazz. What surprises me is that in all that time, you've never heard of diversity. I think you are smiling right now

I've only come across it once or twice mate but never had it explained!

 

[telectrix]

basically it's just using common sense, estimating the actual current drawn when not all loads will be switched on simultaneously. for example, if you add up all the MCB ratings in a CU, you may get a total of 250A, but in actual fact, the load on the supply will be only be around 60A.

 

[GLENNSPARK]

Thanks a lot mate. Can diversity be applied to all installations? If so, is it the same formula?

not instantanious water heaters (showers etc)....
anything it needs it gets....

 

[dazza1981]

hi mate
your lucky then because i qualified a couple of years ago and in the final year there were loads of diversity calculations e had to do and quite a few diversity questions popped up in my exams.

 

[Hawkmoon]

Confused!!

How come Mr 'Adding sockets to existing ring' gets hauled over the coals but this OP gets kid gloves?


Just wondering what the qualifying parameters are lol....

 

[Spoon]

Its all down to looks.. Thats why good looking women get let out of side roads more when you are driving....

 

[Guitarist]

Confused!!

How come Mr 'Adding sockets to existing ring' gets hauled over the coals but this OP gets kid gloves?


Just wondering what the qualifying parameters are lol....

No parameters... I treat everyone with disdain...