Supply to cabin

[Hefferl]

I need to run a supply to a cabin (3m x 5m) (8.5kw shower, small power radial and lighting) which will be less than 1m from the house. There are no spare ways in current board. I was considering spiltting tails (block already there) and installing a garage unit (2 way) next to current board and then taking indvidual circuits (PVC) out to cabin (10mm for shower 2.5mm for power and fused down for lighting). I will provide mechanical protection for the cables. This will mean that there will be no cu in the cabin. This way the entire cable run will have overcurrent & rcd protection.

I know I need to consider max demand, earthing arrangements and it being a special location (sockets 3m away etc). Is there a better approach than this?

 

[steptoe]

Yes,

Submain.

 

[Hefferl]

Yes,Submain.

How will I provide RCD and Overcurrent protection for the cable?

 

[steptoe]

Should you be doing this if you need to ask that question?

 

[Hefferl]

Should you be doing this if you need to ask that question?

I'm asking for advice on the best way to proceed which I think is preferable to forging on blindly.

Is this not what these forums are for?

---------- Post Auto-Merged at 13:31 ---------- Previous post was made at 13:19 ----------

As there is no spare way available to me in the existing cu what is best way for me to install a protective device?

 

[steptoe]

MC switch fuse & SWA

 

[Hefferl]

MC switch fuse & SWA

Thanks.

So this would mean SWA run through the house as well as outside. I get that this would alleviate the need for an RCD to protect this cable but was concerned about the expense of the SWA which is why I was considering Garage CU and RCD protection at source.

Leaving myself open to be shot down again here but if you don't ask how do you find out - apart from my suggestion meaning the protective devices would be in the house and the inconvenience that may present what other short comings does it have.

:Blushing :Blushing

 

[Badfish]

+1 with steps.Then you will only have to run one cable to the cabin rather than 3.Does the armoured have to go through the house or can you take it outside?

 

[Hefferl]

+1 with steps.Then you will only have to run one cable to the cabin rather than 3.Does the armoured have to go through the house or can you take it outside?

Unfortunately due to a single storey extension the cu is now in a cupboard which is in the middle of the house - which has concrete floors too.

---------- Post Auto-Merged at 16:31 ---------- Previous post was made at 16:29 ----------

I'm here to learn. For my education is there anything unsafe or anything that doesn't comply about my suggestion.

 

[SparkyMarky]

Well I suppose 314.1(i) if you want to be picky. However, I think it's more a case of why would you want to do it like that. What type of supply do you have? Are there extraneous conductive parts in the cabin? . . . . . Why is running a single 10mm swa less aesthetically pleasing than a 10mm t&e, a 2.5 t&e and a 10mm green n yellow (if required)? etc etc.

Switch fuse, sub main and tidy db in cabin is the answer to the op in my humble opinion!

 

[steptoe]

what sort of supply you got hef.?

oh, sorry for the short comment earlier, was on my phone and it posted before I had finished,

(well, maybe I hit the wrong button, :| )

 

[Hefferl]

Well I suppose 314.1(i) if you want to be picky. However, I think it's more a case of why would you want to do it like that. What type of supply do you have? Are there extraneous conductive parts in the cabin? . . . . . Why is running a single 10mm swa less aesthetically pleasing than a 10mm t&e, a 2.5 t&e and a 10mm green n yellow (if required)? etc etc.Switch fuse, sub main and tidy db in cabin is the answer to the op in my humble opinion!

Yeah agreed and I did concede this in my post #7.

Please don't misunderstand I am not arguing that my suggestion was better than Steps - indeed thats why I created this thread - for some good advice. The reason why I asked about the shortcomings of my suggestion was to make sure there wasnt also something fundamental safety wise that I was missing.

Obviously there will be water to the shower - but I'm assued this will be supplied via plastic so nothing likely to introduce earth potential.

---------- Post Auto-Merged at 20:54 ---------- Previous post was made at 20:52 ----------

what sort of supply you got hef.?oh, sorry for the short comment earlier, was on my phone and it posted before I had finished,

(well, maybe I hit the wrong button, :| )

No worries and thanks for bearing with me.

Supply is TN-C-S (eek!)

 

[steptoe]

So, you want to export a TNCS supply to an external bathroom, as such?

Not a very good idea IMHO.

 

[Hefferl]

Who said that?

 

[steptoe]

what?

 

[Lillpete]

With TNCS you should be fine for disconnection times to protect the SWA, then terminate it into a plastic enclosure in the Cabin and bang in a rod for the cabin CCU

Job done B-)

 

[Hefferl]

what?

was thinking of rod for cabin earth and Swa just earthed at house end , no bonding required - is that the way forward?Sorry as per Lillpete

 

[steptoe]

Yes, imo,

Others may have different viewpoints though.

 

[Sidewinder]

Why not correctly extend the equipotential zone... ]