SWA size. 6mm ok or 10mm needed?

Peter Hahn · Sep 4, 2018

Hi guys,

any advice on what size of SWA should be burried for garage? Will be aprrox 15m long. Garage will have 6A lighting circuit 20A socket circuit and 32A power socket. Idealy 2core SWA as only one phase needed. IS 6mm ok or 10mm needed?

THX.

davesparks · Sep 4, 2018

Are there any extraneous conductive parts?
What is the design load?
What type of OCPD and current rating?

Octopus · Sep 4, 2018

I think you need a spark in this and it falls foul of part P too.

Peter Hahn · Sep 4, 2018

davesparks said:
Are there any extraneous conductive parts?
What is the design load?
What type of OCPD and current rating?

No there are not. Design load of maximum 58A that means 13.34KW. OCPD 60947-3 probably 80amp as main switch (in the house) and then RCDo 63amp in mcb in garage.

By my calculations 10mm would be better. Correct?

Spoon · Sep 4, 2018

Welcome to the forum mate.

If you answer the questions in post #2 then we can help you out more, maybe.
Also be aware of post #3 comment regarding Part P.

Rosco · Sep 4, 2018

To OP you mention only needing one phase is this commercial or domestic?

Peter Hahn · Sep 4, 2018

Spoon said:
Welcome to the forum mate.

If you answer the questions in post #2 then we can help you out more, maybe.
Also be aware of post #3 comment regarding Part P.

Replyed mate. It takes ages to get aproved (probably as i am new in here)

Peter Hahn · Sep 4, 2018

Rosco said:
To OP you mention only needing one phase is this commercial or domestic?

Domestic mate.

Peter Hahn · Sep 4, 2018

Murdoch said:
I think you need a spark in this and it falls foul of part P too.

Pased my Part P couple of month ago

Octopus · Sep 4, 2018

Love these threads, the op keeps looking at the thread but offers up no answers .............

Strima · Sep 4, 2018

Also earthing arrangements and existing PFC and Ze?

Octopus · Sep 4, 2018

Peter Hahn said:
Passed my Part P couple of month ago

Hum ...... then shouldn't you know this? and unless you are a member of a CPS its still an issue..

Darkwood · Sep 4, 2018

Murdoch said:
Love these threads, the op keeps looking at the thread but offers up no answers .............

We are a bit delayed on approving posts some days, the OP did reply but had to have the posts approved, staff unusually busy at the moment on the work front so if you all can bear with

Spoon · Sep 4, 2018

Peter Hahn said:
Garage will have 6A lighting circuit 20A socket circuit and 32A power socket

Peter Hahn said:
Design load of maximum 58A

Looks like you have just added up the breaker sizes for the demand. What about diversity?

[ElectriciansForums.net] SWA size. 6mm ok or 10mm needed?

What are you intending to use in your garage to use 58A?

Andy78 · Sep 4, 2018

Peter Hahn said:
No there are not. Design load of maximum 58A that means 13.34KW. OCPD 60947-3 probably 80amp as main switch (in the house) and then RCDo 63amp in mcb in garage.

By my calculations 10mm would be better. Correct?

Quite a worrying response here. OCPD for the garage supply is the house CU main switch ?

As you are a new member could you state what qualification and experience you have, or pop it on your profile and set your profile to be able to be viewed publicly. This will help us help you best.

Rosco · Sep 4, 2018

Spoon said:
What are you intending to use in your garage to use 58A?

Lots of heat lamps and extraction equipment by the sounds of it

LankyWill · Sep 4, 2018

You need a 35mm 4 core

buzzlightyear · Sep 4, 2018

Peter Hahn said:
----ed my Part P couple of month ago

correct that for him

buzzlightyear · Sep 4, 2018

Rosco said:
Lots of heat lamps and extraction equipment by the sounds of it

installed by bob hope and co.

davesparks · Sep 4, 2018

Peter Hahn said:
No there are not. Design load of maximum 58A that means 13.34KW. OCPD 60947-3 probably 80amp as main switch (in the house) and then RCDo 63amp in mcb in garage.

By my calculations 10mm would be better. Correct?

I didn’t think 60947-3 related to OCPDs, but I may be wrong.

Do you mean you are intending to use an 80A OCPD? In which case I don’t think 10mm will be suitable, off the top of my head 16mm may be better.

Peter Hahn · Sep 4, 2018

Rosco said:
Lots of heat lamps and extraction equipment by the sounds of it

Lol

probably. But not sure. Customer request.

buzzlightyear · Sep 4, 2018

Peter Hahn said:
Idealy 2core SWA as only one phase needed. IS 6mm

only one single phase. or sub mains .

Peter Hahn · Sep 4, 2018

Murdoch said:
Hum ...... then shouldn't you know this? and unless you are a member of a CPS its still an issue..

Well done that is the topic

Peter Hahn · Sep 4, 2018

Andy78 said:
Quite a worrying response here. OCPD for the garage supply is the house CU main switch ?

As you are a new member could you state what qualification and experience you have, or pop it on your profile and set your profile to be able to be viewed publicly. This will help us help you best.

No it is not.

DPG · Sep 4, 2018

Peter Hahn said:
No it is not.

What OCPD will be feeding the SWA?

-

davesparks

Octopus

-

-

-

-

-

-

Octopus

-

Octopus

-

-

-

LankyWill

-

-

davesparks

-

-

-

-

-

Similar Threads

OFFICIAL SPONSORS