Choosing a power supply, switch fuse size

[Spoon]

Yes spoon, they are wired with 2.5 pvc single and I always thought that would be the maximum rating, do you think I'm wrong?

I think you are wrong in that you are designing a circuit based on what cable you have.....
You say you want the max rating. Well then use the appropriate wire for that rating. Simple.

 

[Spoon]

I have wired those rooms with two feeds. The plan is to have two circuits with 4 socket or a ring of 8

Thanks

Sorry mate... I'm confused. Why use a different wiring method for 4 or 8 sockets? What is the reason?

 

[Yanu]

I think you are wrong in that you are designing a circuit based on what cable you have.....
You say you want the max rating. Well then use the appropriate wire for that rating. Simple.

Sorry Spoon.. how would you wire a socket circuit? wouldnt you use a 2.5 cable for it. Wouldnt you put a 20 amp rcbo for that?

 

[Yanu]

Sorry mate... I'm confused. Why use a different wiring method for 4 or 8 sockets? What is the reason?

I remember an engeneer once told me to put a max of 4 sockets on a circuit and I'm following that advice. What's the max you'd put?

 

[Yanu]

You cannot be guessing the circuit design and then ask people on a forum who have no knowledge of the site to confirm your guesses are correct.

I have no knowledge of the site either. I have to do a job and looking for help, this seemed the right place for it. I seem to be getting lots of hassle here on how little I know and nobody is really telling me what they would do in my position

 

[MJPD29]

Hand dryers will require rcd protection for a start, there is not a limit of 4 sockets either, but if you don't think your capable of doing the job (that's not a jab at you by the way) id say to your boss that you don't think your able to, you probably shouldn't undertake it if you can't provide the correct protection for each circuit. Will you be able to test it when finished?

 

[westward10]

You said previously these cold stores are normally straight forward, what is different now. If you have no knowledge of the site then that should be your first port of call, either visit the site or see specifications for the site.

 

[telectrix]

I remember an engeneer once told me to put a max of 4 sockets on a circuit and I'm following that advice. What's the max you'd put?

well he told you a load of cobblers. you need to stop guessing and calclulate properly. first determine the design current Ib. then select your cable so that it's max. current Iz > Ib. then select OCPD according to Iz>In>Ib.where In is the OCPD rating in amps. then calculate VD to ensure that the cable you have selected is suitable.

 

[Risteard]

Your location states Ireland. Am I correct in assuming that these jobs are in the 26-Counties?

 

[Yanu]

Your location states Ireland. Am I correct in assuming that these jobs are in the 26-Counties?

Yes, they will be shipped to Scotland

 

[Spoon]

Sorry Spoon.. how would you wire a socket circuit? wouldnt you use a 2.5 cable for it. Wouldnt you put a 20 amp rcbo for that?

My employer says that the sockets are for general use and to go with the maximum rating to cover ourselves

Why not 30A or 32A?
I would use the correct size cable for the installation method.

 

[Spoon]

I remember an engeneer once told me to put a max of 4 sockets on a circuit and I'm following that advice. What's the max you'd put?

As already mentioned above mate. The engineer was talking rubbish.
I would ask that the customer what quantity they wanted.

 

[Risteard]

Yes, they will be shipped to Scotland

Are these being wired to ET101 or BS7671 then?

 

[Yanu]

You said previously these cold stores are normally straight forward, what is different now. If you have no knowledge of the site then that should be your first port of call, either visit the site or see specifications for the site.

The coldstores usually comes with a fridge that has all the breakers pre installed, I only wire to them. This particular complex has a few rooms that are just "ambient", no fridge required. I have to wire lights and sockets in them and put a fuse board to feed them

 

[Spoon]

I have no knowledge of the site either. I have to do a job and looking for help, this seemed the right place for it. I seem to be getting lots of hassle here on how little I know and nobody is really telling me what they would do in my position

I am giving you advice mate....

 

[Yanu]

As already mentioned above mate. The engineer was talking rubbish.
I would ask that the customer what quantity they wanted.

I cant ask the customer how many sockets he wants in a circuit though... How many sockets do you put in a circuit when wiring a house?

 

[Yanu]

Hand dryers will require rcd protection for a start, there is not a limit of 4 sockets either, but if you don't think your capable of doing the job (that's not a jab at you by the way) id say to your boss that you don't think your able to, you probably shouldn't undertake it if you can't provide the correct protection for each circuit. Will you be able to test it when finished?

Thanks for the hand driers tip, you are right. It makes sense.
Yes, I can test them. I have a megger and perform a full test when the coldstores are finished

 

[Spoon]

I cant ask the customer how many sockets he wants in a circuit though... How many sockets do you put in a circuit when wiring a house?

I'm industrial. Don't do domestic.
If I did it would all depend on the size of the rooms and room function as to how many sockets I would put in.

 

[Yanu]

I am giving you advice mate....

Thanks Spoon I just thought it would be a simple enough task to wire a few lights and sockets and everybody is making a big deal about it without really telling me anything...

 

[Yanu]

Are these being wired to ET101 or BS7671 then?

I guess ET101. Are there many differences in your opinion? for a few lights and sockets?