mains supply to outside gate electric motor

by **captain** » Fri Apr 17, 2009 3:55 pm

I want to install a mains electric supply to an electric motor for opening a heavy wooden sliding gate across my drive.

I intend to take the cable underground for about three metres. I want the installation to comply with the IEE regulations 17th edition.

The questions I have are:

Should there be a dedicated RCD for this circuit?

Can the RCD be fitted to the external wall where the cable will emerge?

What cable should be used - SWA (steel wire armoured), SY flexible, or 2.5 mm PVC twin and earth run through PVC electrical conduit?

How deep should the trench be, and does it have to be marked?

I am a Chartered Electrical Engineer (electronics) and very practical, but not a qualified electrician. I am very aware of safety issues.

Thanks :shock:

by **ban_all_sheds** » Fri Apr 17, 2009 10:00 pm

swa is 2.5 is fine

no need to rcd protect cable

600mm is regarded as deep enough, place some orange marker tape 200mm above cable.

by **captain** » Sat Apr 18, 2009 3:12 pm

Many thanks for the prompt reply.

You wrote 'swa is 2.5 is fine'.

Did you mean - swa or 2.5 is fine?

by **ban_all_sheds** » Sat Apr 18, 2009 9:17 pm

sorry.

2.5 swa is fine

by **sparx** » Sun Apr 19, 2009 10:52 pm

Hi, although you may have some very good qualifications unless you are registered with a Part-p competant persons scheme, you must notify building control before starting this work out doors, and pay an inspection fee. This is legal requirement,
regards SPARX

by **troublemaker** » Sun Jul 19, 2009 5:23 pm

I realise this thread is rather old but I was surprised at this comment:-

[quote="ban_all_sheds"]no need to rcd protect cable[/quote]

I thought it good practice, if not a requirement, to ensure all outdoor circuits are protected by a 30mA RCD (in the consumer unit or dedicated if not).