help me wire this please

[shocksl]

Hey guys


As some of you know I study at York College. I am working on an assignment exam, Which I need some help with.

Fixed appliances:

• 12k W electric cooker with induction hub (no socket)
• 300W extractor over cooker
• 7 KW electrical central heating and hot water boiler.

Building construction :

• Outer walls - brick with wood cladding, insulated cavity
• Inner walls : plasterboard dot and dabbed onto lightweight blockwork
• Floors: laminate flooring on 50mm concrete seed.
• Ceiling lasterboarded through with acess hatch into fully accessible loft void above. Ceiling 2.3m above finished floor level.
• Loft insulation : this 250mm thick and cables are to be clipped to joist or lay on plasterboard.

Electric supply

• 230v , TNCS, with ZE and PFC at 0.3 ohms and 0.77ka
• Amb temp 25 degrees

This is for a 2 bedroom bunglow and I need to wire it.





I have decided the accessories will include the below and with FSU for boiler, and cooker:


2 bedrooms –ill put 1 x light in each room. And 3 x double sockets each room

1 onsuite room – so 1x light – no sockets

Small hallway – 1 xlight and 1 double socket and 1 smoke alarm

Bathroom has sections so 2x lights. 0 sockets

Utlity room – 1 x light plus 2 x double sockets

Kitchen 1 xlight. Plus about 7 xdouble sockets and 2 x single sockets.

Large diner and lounge room integrated.. so therefore 2 x lights plus 5 x double sockets



If you think I should add more please let me know.



What will be the best way to wire this ? since theres concrete under laminated flooring, . I am thinking of taking the cables from the consumer unit and take the wire up to the loft clip to joists and drop to the nearest socket for the circuit and then back up the wall clip up the joist and come down again into the next socket. And repeat until the sockets are complete. For the ring curcuits. Take the wire back again same way


In terms of lights can I just lay them over the plastboard? And it doesn’t matter how they go as theres no safe zone etc. is this correct? So in affect I can just go up the consumer unit abover th plasterboard just go in diagnels if I have to get the light and switches?

once Ive done this I will do all the calcs required.



Any advice would be greatly applreciated. I am more than happy to discuss further,.



thanks

 

[richy3333]

Hi.
What is the assignment question - sorry you haven't specified this. Presumably you need to do cable calculations?

What are you studying at York college?

What reference material do you have? - BS7671?

I think if you try and answer the assignment question members will jump on to help with advice and pointers etc

 

[littlespark]

Diagonal runs? No.

And what do you mean no safe zones?


Might need more than one smoke detector.

Extractor fan in bathrooms?

Appliance switches in kitchen?

How many of each circuit? 2 or 3 rfc’s… 1 just for kitchen. 2 or 3 lighting circuits?

12kW for cooker? That’s massive.

 

[shocksl]

Hi.
What is the assignment question - sorry you haven't specified this. Presumably you need to do cable calculations?

What are you studying at York college?

What reference material do you have? - BS7671?

I think if you try and answer the assignment question members will jump on to help with advice and pointers etc

I'm ok with the cable calcs. That will be after ive workd out how i will wire the bungolow. Ive wrote it in the last paragraph.. . ref is BS7671

So basically I have a layout diagram and I need to wire it up and put accessories etc on it. Which I have stated in the first post.

Once I get that bit right I can then move onto doing the calcs.

 

[shocksl]

Diagonal runs? No.

And what do you mean no safe zones?


Might need more than one smoke detector.

Extractor fan in bathrooms?

Appliance switches in kitchen?

How many of each circuit? 2 or 3 rfc’s… 1 just for kitchen. 2 or 3 lighting circuits?

12kW for cooker? That’s massive.

I propose

1 radial for cooker
1 radial circuit for boiler
Kitchen has 1 final ring
Rest of the bunglow on 2nd ring
2 lighting circuits to avoid voltage drop.

Yes 12kw is massive but it's part of the assignment brief.

Good shout to add the those to my list .

 

[shocksl]

This is how the layout looks. I haven't put all the accessories etc on it yet

 

[richy3333]

Id say that the plan looks ok. In the kitchen you have the light switch behind the door. Don't know about England and Part pee but in Scotland light switches have to be outside the bathroom.

I can't help much more as I'm still confused as to what you want help with.

 

[shocksl]

Id say that the plan looks ok. In the kitchen you have the light switch behind the door. Don't know about England and Part pee but in Scotland light switches have to be outside the bathroom.

I can't help much more as I'm still confused as to what you want help with.

How to wire it to the different cables . So how do I get the different cables to all the different accessories. That's something I've never done. So I'll find out the length of cables for each circuits so I can do my cable cals which I'm comfortable with.

 

[mainline]

Diagonal runs? No.
And what do you mean no safe zones?

The cables wouldn't be concealed.

 

[plugsandsparks]

Agree - drop down from loft, however for sockets you can go horizontal once you have dropped down, also there may be opportunities to place sockets on either side of walls to reduce cable runs.

Your cooker cct is going to be a challenge for cable and local isolator so allow space for a fat cable and huge isolator, lol

 

[mainline]

I wouldn't use 3 ring finals, I would radial the bedrooms.

Socket on side of beds, usb ?

More lights in kitchen, cabinet under lights ? Cooker hood ?

Bathroom shaver socket/ mirror light ? Fan ?

 

[shocksl]

I wouldn't use 3 ring finals, I would radial the bedrooms.

Socket on side of beds, usb ?

More lights in kitchen, cabinet under lights ? Cooker hood ?

Bathroom shaver socket/ mirror light ? Fan ?

Hi

As its for an assignment I don't want to add too many things so I don't over complicate things for myself when I do the cable calcs etc. It's not for real life. I think their concerned if I get the main things in and can work it all out at the end.

Maybe I'll add a fan to the bathroom. Would that just spur off the light ?

So are you saying 1 radial covering both bedroom rooms. 1 radial for cooker, 1 radial for boiler. 1 ring for lounge/diner and hallway ?

 

[shocksl]

Agree - drop down from loft, however for sockets you can go horizontal once you have dropped down, also there may be opportunities to place sockets on either side of walls to reduce cable runs.

Your cooker cct is going to be a challenge for cable and local isolator so allow space for a fat cable and huge isolator, lol

So would you say drop down from loft to a room go horizontal for all the sockets ie 2 double sockets in bedroom. Then go back up to the loft and drop down into the next room ?

 

[mainline]

Hi

As its for an assignment I don't want to add too many things so I don't over complicate things for myself when I do the cable calcs etc. It's not for real life. I think their concerned if I get the main things in and can work it all out at the end.

Maybe I'll add a fan to the bathroom. Would that just spur off the light ?

So are you saying 1 radial covering both bedroom rooms. 1 radial for cooker, 1 radial for boiler. 1 ring for lounge/diner and hallway ?

If the fan is a timed one then it would require a 3 pole isolator, if not then a dp fused switch would do.

Yes, off the bathroom lighting circuit.

 

[shocksl]

If the fan is a timed one then it would require a 3 pole isolator, if not then a dp fused switch would do.

Yes, off the bathroom lighting circuit.

Thank you would that come off the light circuit ?

Also can you tell me how would it benefit having more radials than rings please ?