Armoured cable

derrick

Looking to run an armoured cable from my garage 40 metres up my garden to supply a sump pump.

Have found a site that seems reasonable prices but won't give advice.

I need to know what size I need to power the pump.

I was thinking 2.5mm 3 core as per this page

Core colours: Brown / Black / Grey
Voltage rating: 600/1000v.


Re the voltage rating will it be OK for 240v ?


Or would this one, (1.5mm), be OK, still saying:

Core colours: Brown / Blue / Green & Yellow
Voltage rating: 600/1000v


Again would 240v be OK ?


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Warwick_Hunt

Surely your electrician will supply the right cable as per his design.

onomatopoeia99

Insufficient information. You need to know the power draw of the pump to work out the cable thickness required, and given the length of the run there may be other factors to consider - resistance increases proportional to length and the voltage could potentially drop between the consumer unit and the.device.

The calcs are all in the regs if you want to do them.

derrick

Warwick_Hunt wrote: »

Surely your electrician will supply the right cable as per his design.

Purchasing and doing myself.

onomatopoeia99 wrote: »

Insufficient information. You need to know the power draw of the pump to work out the cable thickness required, and given the length of the run there may be other factors to consider - resistance increases proportional to length and the voltage could potentially drop between the consumer unit and the.device.

The calcs are all in the regs if you want to do them.

Pump 0.35 Amps



I would like to know why the pages linked to state "Voltage rating: 600/1000v".

Surely if the cable is sufficient for 600v it will be OK for 240v.

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Keep_pedalling

derrick wrote: »

Purchasing and doing myself.





Pump 0.35 Amps



I would like to know why the pages linked to state "Voltage rating: 600/1000v".

Surely if the cable is sufficient for 600v it will be OK for 240v.

.

You do know that this is notifiable work don’t you?

http://www.niceic.com/what-is-notifiable-work

EachPenny

derrick wrote: »

Looking to run an armoured cable from my garage 40 metres up my garden to supply a sump pump.

I'm not going to contradict the other posters who suggest you need to seek professional advice, but are you really running a supply to the garage just to supply a sump pump?

If I was going to the hassle and expense of putting in a 40m armoured cable to an outbuilding then I would also be looking at adding lighting and some sockets as well. The additional cost of the larger cable required would be offset by the valuable benefits of light and power in the garage.

Furthermore, with professional advice you might discover that there is a way of doing the installation so you only need 2-core, not 3-core - and the saving achieved by reducing the number of cores may pay for the cost of having the larger and more useful csa. I've been involved in getting electricity laid on to several domestic outbuildings over the years, each time I've requested the electrician uses 6mm, even if it was possible to 'get away with' 1.5mm.

You ought to be able to negotiate a quote with an electrician on the basis you will dig the trench required for the cable. That way you only pay for the services you need, and all that digging is going to be the most time consuming part of the job.

Warwick_Hunt

derrick wrote: »

Purchasing and doing myself.





Pump 0.35 Amps



I would like to know why the pages linked to state "Voltage rating: 600/1000v".

Surely if the cable is sufficient for 600v it will be OK for 240v.

.

https://www.cse-distributors.co.uk/cable/technical-tables-useful-info/voltage-drop-calculations/

As you’ve deemed yourself competent get on here and work it out.

derrick

EachPenny wrote: »

I'm not going to contradict the other posters who suggest you need to seek professional advice, but are you really running a supply to the garage just to supply a sump pump?

If I was going to the hassle and expense of putting in a 40m armoured cable to an outbuilding then I would also be looking at adding lighting and some sockets as well. The additional cost of the larger cable required would be offset by the valuable benefits of light and power in the garage.

Furthermore, with professional advice you might discover that there is a way of doing the installation so you only need 2-core, not 3-core - and the saving achieved by reducing the number of cores may pay for the cost of having the larger and more useful csa. I've been involved in getting electricity laid on to several domestic outbuildings over the years, each time I've requested the electrician uses 6mm, even if it was possible to 'get away with' 1.5mm.

You ought to be able to negotiate a quote with an electrician on the basis you will dig the trench required for the cable. That way you only pay for the services you need, and all that digging is going to be the most time consuming part of the job.

Not sure what you missed from the OP, but the garage has power, I am looking to put the sump 40 metres away from the garage, without the use of an electrician.

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Risteard

derrick wrote: »

without the use of an electrician.

.

Wrong answer.

You are clearly wholly incompetent for this work.

Get an Electrician or do without power.

THERE ARE NO OTHER OPTIONS.

EachPenny

derrick wrote: »

Not sure what you missed from the OP, but the garage has power, I am looking to put the sump 40 metres away from the garage, without the use of an electrician.

Yes, I read 'from' as 'to'. Silly mistake. As is being snarky with people offering advice.

The same principles apply though.... if you are going to the trouble of laying 40m of cable to any point in the garden where you don't already have power.

Ectophile

600/1000V rating is perfectly fine for 240V mains. Neither cable size is going to be even remotely stressed by 0.35A.

So the thing you need to check is whether or not the voltage drop will be acceptable.

I suspect with such a tiny current, it'll be fine.