Can one run boxed dual sockets linked together from an extension cable?

[FrodoOne]

Actually Arctic cables ... (click here) .

Kind Regards, John

I thought so.
(Even although the spell checker advises against "artic" it was still used !)

 

[bernardgreen]

To give him credit they do do it round here, not sure if its multicore rather than flex, there yellow and strung up on 20 foot poles cemented into barrels,

The use of concrete filled barrels suggests it is a long term temporary "installation" with overhead cables at least 5.5 metres above live traffic lanes.

It is quite common to see temporary lash ups of this sort feeding traffic lights at roadworks

When Winston1 posted that observation the discussion was about 13 Amp sockets fed by flexible cable.

 

[Harry Bloomfield]

There is nothing wrong with plugging in an extension lead with multi socket outlets.

There may be issues over protection of cable and cable size, but unless you live in Wales nothing really to stop you.

I would want/expect it to be protected by an RCD.

 

[Harry Bloomfield]

To give him credit they do do it round here, not sure if its multicore rather than flex, there yellow and strung up on 20 foot poles cemented into barrels, i quess the idea is they can move them around themselves as the work area changes.
sure theres currently some at old street roundabout in london

I agree I too have seem them, once (pre-wireless) they were the only way. Even now, for a longer more static job, I suspect they still use them. The wireless ones are quick to set up and relocate, sometimes they just have them operating mobile on a truck. They have the disadvantage of needing to have the batteries swapped out for recharge regularly. When they were doing work on the gas mains a few years ago in my street, I noticed the specialist contractor seemed to arrive to swap out the batteries at least daily. The temporary wired ones, will need either a generator, battery or a mains supply + site transformer.

 

[ericmark]

I would want/expect it to be protected by an RCD.

I did say there may be issues over protection, and yes I would also want RCD protection, and likely SWA cable, but the Blagdon system is basic doing exactly what has been suggested, and other than getting around the Welsh Part P laws inherited from the English doing the job without little connectors so classed as a pre-assembled unit to get around the law must be better.

I do not see how this progressed to traffic lights? However back in the 70's I was involved with portable traffic lights, and it was found we have a 110 volt IT supply, it seemed this was not permitted, and had to convert to 55-0-55 volt with a centre tapped earth, I remember the county council legal department getting involved and the company who had supplied the traffic lights had to recall them and convert them to 55-0-55 volt by adding a auto transformer with a centre tap to generator.

Yes I know I have seen temp traffic lights running from a street lamp supply, but today with lower power requirements normally battery powered.

 

[bernardgreen]

We had 6 weeks of three way temporary traffic lights when my roof was being re-thatched. Battery life was definitely a problem. A couple of times it was necessary to get the traffic management company out to replace the batteries.