Garden shed cable size

[clematis432]

Hi, I,m running a supply to my neighbour,s new garage and would appreciate advice on cable size. It will be 3 core SWA running underground. The max load will be around 8A and that only for small periods(power tools) other than that only lighting,and total run will be about 30mts from house DB. I advised him to get 4mm but now think 2.5mm would do. I,m ex maintenance and retired so am very rusty regarding design calcs.
Sorry to ask further, but if he decides to take his supply from ring main to avoid approx 15mt run under floor boards will same cable size(2.5mm) be adequate if I spur it via FCU
Thanks

 

[LankyWill]

what does the regs say mate? Im not getting paid to design your install?

 

[clematis432]

You want paid ? Thanks for your help mate.

what does the regs say mate? Im not getting paid to design your install?

 

[telectrix]

download cable calc from coopersoft to your smartphone.

 

[Octopus]

Hum...are you looking for a cheap design or a proper design?

 

[clematis432]

Hum...are you looking for a cheap design or a proper design?

Proper design please, I,m battling a bit with Coopersoft calculator but thanks Telectrix

 

[Spoon]

What is the earthing system of your neighbour's house?
Does it have RCD protection?
What breaker size are you thinking of using? Or fuse if coming off a FCU?

Who is doing the install?
Do they have proper equipment to fill in the cert?

 

[LankyWill]

run it in bellwire and save yourself some cash!

 

[clematis432]

What is the earthing system of your neighbour's house?
Does it have RCD protection?
What breaker size are you thinking of using? Or fuse if coming off a FCU?

Who is doing the install?
Do they have proper equipment to fill in the cert?

TNS/Yes/B20/13A/Me/Do you need to certify in Scotland ?
Lanky Will trying hard for attention
Is it too much to ask for advice on this forum, to help an ex leccie who is a bit rusty with design ?
Not really asking for much, and attention seeking Lanky willy wants paid as well !

 

[Spoon]

Is it too much to ask for advice on this forum, to help an ex leccie who is a bit rusty with design ?

We do like to help people out on this forum mate. We just like to make sure we have all the info first, and whoever is going it will not harm themselves doing the job.
How are you running the armour?
What are you thinking of putting in the shed (like a new CU)?

 

[clematis432]

I,ve given most of the relevant info Spoon, I,ve already mentioned the cable is going underground and the expected load of the garage. Disappointed with some replies though think I,ll just go forget it now. It was not a complex thing I asked, the protection side of it was not an issue just wanted simple yes or no to 3core 2.5mm SWA.

 

[GMES]

I,ve given most of the relevant info Spoon, I,ve already mentioned the cable is going underground and the expected load of the garage. Disappointed with some replies though think I,ll just go forget it now. It was not a complex thing I asked, the protection side of it was not an issue just wanted simple yes or no to 3core 2.5mm SWA.

The Members are sometimes hesitant to give out a step by step guide of how to carry out an installation, it may seem like they are having a pop but they're just being weary.
If you look at the bit of your post that I have highlighted, this is what causes the issue, because if it isn't complicated then it shouldn't need explaining and please don't take that the wrong way I am merely trying to show you why it causes a bit of friction, But having said that can we all keep it civil and sensible please.

 

[davesparks]

TNS/Yes/B20/13A/Me/Do you need to certify in Scotland ?
Lanky Will trying hard for attention
Is it too much to ask for advice on this forum, to help an ex leccie who is a bit rusty with design ?
Not really asking for much, and attention seeking Lanky willy wants paid as well !

Yes you do need to certify the work according to the wiring regulations using an electrical installation certificate, otherwise your work will not be compliant with bs7671 and then you will more than likely not be covered by your insurance.
What you don't have to deal with is the part P notification nonsense we have on this side of hadrians wall.

As far as the job goes, personally I would not connect it to the ring circuit as it has potential to cause trouble if a fault in the shed takes out the rcd and/or mcb covering the ring.
A seperate way in the CU with a 20A mcb (or fuse if at all possible) and rcd protection fitted at the shed end would be my preferred method.

For that distance I would be inclined towards a 4mm cable as it will reduce volt drop and allow a bit of tolerance if they wish to add a bit more load later.

 

[Spoon]

Sounds like a RCD is already on the house CU dave. If fitting one in the shed the OP will have to apply discrimination.

Sorry dave, that statement is more info for the OP.

 

[Octopus]

I,ve given most of the relevant info Spoon, I,ve already mentioned the cable is going underground and the expected load of the garage. Disappointed with some replies though think I,ll just go forget it now. It was not a complex thing I asked, the protection side of it was not an issue just wanted simple yes or no to 3core 2.5mm SWA.

Hum..... an interesting response..... a bit on the arrogant side IMHO. Me thinks help may be evaporating now.

 

[LankyWill]

As above, i am all for helping people out but i draw the line at doing all the legwork when someone of sufficient experience cant form an answer of their own accord. I mean i asked a similar question but i provided the guys with all the info and showed the conclusion i had drawn with all the relevant calcs. I received lots of helpful info...

 

[Darkwood]

As above, i am all for helping people out but i draw the line at doing all the legwork when someone of sufficient experience cant form an answer of their own accord. I mean i asked a similar question but i provided the guys with all the info and showed the conclusion i had drawn with all the relevant calcs. I received lots of helpful info...

Although I agree with where your coming from here, I believe you first 2 posts contributing to this thread didn't help or give any constructive advice, it only baited for a negative reaction. You could have easily made the same point while been polite and in a positive manner, yes one of your comments was in jest but that only exacerbated the response from the OP.

Can we see less of the short quick trolling comments please and more positive replies, if you feel the OP is asking too much then there is more than one way to put that message across

 

[Octopus]

Although I agree with where your coming from here, I believe you first 2 posts contributing to this thread didn't help or give any constructive advice, it only baited for a negative reaction. You could have easily made the same point while been polite and in a positive manner, yes one of your comments was in jest but that only exacerbated the response from the OP.

Can we see less of the short quick trolling comments please and more positive replies, if you feel the OP is asking too much then there is more than one way to put that message across

REALLY.

The OP states he's a spark with many years experience¬!

 

[Darkwood]

REALLY.

The OP states he's a spark with many years experience¬!

I'm not suggesting for a minute the reason for his first post was wrong, like I said, I agree with where he was coming from, my post was regarding how he makes his point and the way he put it across could have been better, it can only get a negative reaction when put like that, then following it up with the bellwire comment.

 

[LankyWill]

duly noted

 

[DPG]

All's well on the forum again. Nice one. Daz

 

[clematis432]

REALLY.

The OP states he's a spark with many years experience¬!

Yes, but mainly in maintenance and now retired 7yrs. When not using your skills much, your knowledge diminishes a bit. But you know your 3 posts to me have all been negative with no thoughts at all of helping someone. You and Lanky Willy do not do this excellent forum any favours. Many thanks to Davesparks and Telectrix

 

[DPG]

Yes, but mainly in maintenance and now retired 7yrs. When not using your skills much, your knowledge diminishes a bit. But you know your 3 posts to me have all been negative with no thoughts at all of helping someone. You and Lanky Willy do not do this excellent forum any favours. Many thanks to Davesparks and Telectrix

I think if your original post had been worded a bit better you may have got a better response, especially if you had included what you have just put in this last post. But it's sometimes tricky to get across the sentiment in words on a computer screen. It's the same with text messages - they sometimes get misunderstood (context etc.). At least everyone's happy again now. Daz

 

[Octopus]

Yes, but mainly in maintenance and now retired 7yrs. When not using your skills much, your knowledge diminishes a bit. But you know your 3 posts to me have all been negative with no thoughts at all of helping someone. You and Lanky Willy do not do this excellent forum any favours. Many thanks to Davesparks and Telectrix

Spot on matey.

You come over as some desperate DIYer and I DO NOT help DIYer's with such problems.

 

[BES]

Hi, I,m running a supply to my neighbour,s new garage and would appreciate advice on cable size. It will be 3 core SWA running underground. The max load will be around 8A and that only for small periods(power tools) other than that only lighting,and total run will be about 30mts from house DB. I advised him to get 4mm but now think 2.5mm would do. I,m ex maintenance and retired so am very rusty regarding design calcs.
Sorry to ask further, but if he decides to take his supply from ring main to avoid approx 15mt run under floor boards will same cable size(2.5mm) be adequate if I spur it via FCU
Thanks

Ib/In/It/Cf/Vd remember these ?

 

[clematis432]

Spot on matey.

You come over as some desperate DIYer and I DO NOT help DIYer's with such problems.

You come over as some desperate person with little sympathy for anyone. I really do not wish YOUR help. Over and out. Thanks to most on the forum.

 

[davesparks]

You come over as some desperate person with little sympathy for anyone. I really do not wish YOUR help. Over and out. Thanks to most on the forum.

Well it is very hard for anyone on here to differentiate between the person who is genuinely a retired electrician and the person who says that to get help with their diy project.

 

[Spoon]

Yes, but mainly in maintenance and now retired 7yrs. When not using your skills much, your knowledge diminishes a bit. But you know your 3 posts to me have all been negative with no thoughts at all of helping someone. You and Lanky Willy do not do this excellent forum any favours. Many thanks to Davesparks and Telectrix

I'm unloved......

 

[davesparks]

I'm unloved......

Haha, he loves me more than you! [emoji13]

 

[Spoon]

Haha, he loves me more than you! [emoji13]

I don't like you any more....................................