Installation Questions

Spikenaylor · Jul 20, 2011

Hi there,
I am new to the trade, having retrained due to redunancy from employer.

I am going to be doing an complete rewire of friends house, big 5 bedroom old style house single bricks walls throughout, with complete new 3rd floor in loft space added, new kitchen extension and rebuild of utility room.

1. In the kitchen to start with, he wants a tall unit with two ovens installed, one single fan assisted and one double fan assisted, and a halogen hob on the opposite side of the room.

Because they are on opposite sides of the kitchen is it the done thing to wire them up on two separate circuits?

2. He also wants underfloor heating in the kitchen and also in two of his bathrooms, again, is it worth it putting all three on one separate circuit or is it a case of finding out exactly what wattage each flooring area will be using and then deciding. Different wattage mats are on the market as I have seen, but then depends on floor area as to total wattage.

3. In the utility room, he is having a big fridge freezer american style so he says, I was going to put this on its own circuit on the Non RCD side with external trunking and labels.

4. I have seen that a extractor fan should be installed in the utility room, but many discussions going on about whether this is the correct advice on a full rewire.

5. Regarding extractor fans, in my house, in the master bedroom with on-suite bathroom, the extractor fan has a 3pole Isolator on the outside of the bathroom, but the main family bathroom is just controlled by a light switch and in the utility room, the extractor fan has a Switched FCU controlling it. Is there a definitive way of wiring up extractor fans?

6. Finally, in his kitchen and bedroom, he wants a small tv on a bracket set up fairly high in the room, thus requiring a socket to be placed high up, what is the thinking about this, is it allowed within the regs, because a unsightly dangling wire to a low socket will not look good.

Thanks for looking, and any info will be greatly received.
Spikenaylor

telectrix · Jul 20, 2011

you seem to have most of it covered. regarding 6. you can fit the socket/s at whatever height the client wants them.the 450mm - 1200mm rule is a building reg. applying only to new build.

malcolmsanford · Jul 20, 2011

Spikenaylor said:
Hi there,
I am new to the trade, having retrained due to redunancy from employer.

I am going to be doing an complete rewire of friends house, big 5 bedroom old style house single bricks walls throughout, with complete new 3rd floor in loft space added, new kitchen extension and rebuild of utility room.

1. In the kitchen to start with, he wants a tall unit with two ovens installed, one single fan assisted and one double fan assisted, and a halogen hob on the opposite side of the room.

Because they are on opposite sides of the kitchen is it the done thing to wire them up on two separate circuits? I assume your going to connect the 2 ovens to a single switch. Have a read of the OSG page 160 section 8.4 though a guide it is quite a good one.

2. He also wants underfloor heating in the kitchen and also in two of his bathrooms, again, is it worth it putting all three on one separate circuit or is it a case of finding out exactly what wattage each flooring area will be using and then deciding. Different wattage mats are on the market as I have seen, but then depends on floor area as to total wattage. If there are 2 rooms in close proximity of each other and the area/wattage fall within the kits parameters then yes you could double up to save costs. But if as it seems money is not a driving factor then 3 separate circuits will give you a better division of the installation.

3. In the utility room, he is having a big fridge freezer american style so he says, I was going to put this on its own circuit on the Non RCD side with external trunking and labels. That is fine if that is what the customer wants

4. I have seen that a extractor fan should be installed in the utility room, but many discussions going on about whether this is the correct advice on a full rewire. Puit it this way I would assess it on it's enviroment. If there is going to be mositure or dampness in the room then yes I would think about extraction, if there isn't then perhaps not need. You cna always check with the local LABC for guidance.

5. Regarding extractor fans, in my house, in the master bedroom with on-suite bathroom, the extractor fan has a 3pole Isolator on the outside of the bathroom, but the main family bathroom is just controlled by a light switch and in the utility room, the extractor fan has a Switched FCU controlling it. Is there a definitive way of wiring up extractor fans? Yes as per manufacturers instructions

6. Finally, in his kitchen and bedroom, he wants a small tv on a bracket set up fairly high in the room, thus requiring a socket to be placed high up, what is the thinking about this, is it allowed within the regs, because a unsightly dangling wire to a low socket will not look good. Our regs yes, and even in Part M of the building regs yes as they are for new builds.

Thanks for looking, and any info will be greatly received.
Spikenaylor