it cant be right ?

[brookwood]

a relative of mine has recently bought a property that has to say the least not had a lot done to it since the 60s !

The most immediate area of concern is a wooden buiding 100 mtrs from the house this building is a workshop and room with the swimming pool filter and pump, lots of lights and sockets. Its electricity is supplied by a what appears to be a standard cable the type you would find on an extension cable, from a 13amp socket outside the house !

I suggested this might not be an ideal arrangement. ??

would a solution be to run 6mm armoured cable (2 core ?) and put an earth rod in ? Then a consumer unit with RCD protection for all sockets and lights ?

Any thoughts welcome, many thanks.

 

[davy_owen_88]

The only solution I can recommend is to get a qualified spark in to sort it out. The current set up is insane, and should be disconnected immediately until it is remedied.

Davy

 

[RF Lighting]

6.0mm² SWA doesnt sound much.

How much power does the pool plant use?

How much power do you require for the workshop?

With the length of the run 6.0mm² SWA would only be good for around 2.5kW (just over 10A)

 

[brookwood]

thanks for the replies. They have disconnected. Thankfully its to cold to worry about the pool not being filtered.

the workshop will no longer be required a few lights and sockets for hand tools would be fine, the pool pump (no heater) is so old they cant find out the HP. 10 amps is probably not enough long term, how do you work that out ,ohms law ? would 10 mm be better ?

would they need 2 core and earth rod, or 3 core ?

thanks

 

[ELZ4742]

http://www.csgnetwork.com/ohmslaw.html

 

[RF Lighting]

Don't forget volts drop. That is going to be the biggest factor on this cable run.

 

[davy_owen_88]

thanks for the replies. They have disconnected. Thankfully its to cold to worry about the pool not being filtered.

the workshop will no longer be required a few lights and sockets for hand tools would be fine, the pool pump (no heater) is so old they cant find out the HP. 10 amps is probably not enough long term, how do you work that out ,ohms law ? would 10 mm be better ?

would they need 2 core and earth rod, or 3 core ?

thanks

10mm^2 would be better but the total load is a factor in determining the cable size and needs to be assessed before you install new cable.

amps = watts / volts

What earthing system do you have?

Davy

 

[brookwood]

thanks for all the replies the house is a TNC-S system, is shall do some sums for them and pass on your kind advice.

Many thanks

 

[eng_tech_solutions]

You will need to know the distance (I think you mentioned 100m) and the maximum current draw. Then get hold of the reg's, look at the cable sizes and calc the volt drop.

Needs to be within 4% of the nominal voltage.

6mm will definitely not be enough for sockets/lights/pumps at 100m.

 

[brookwood]

ok will do thanks for your help.

 

[Lectrician]

4% is the total allowable drop, so the submain should only drop, as a rough guide, half that, allowing the remainder for the sub-circuits.

You need to find the load of the pump, and try to anticipate any future loading. Always go too big - copper prices are beginning to come down now!