Caravan hook-up point

spark 68 · May 16, 2012

I will say it again, The Reg's relating to TT systems seriously do need amending,

The pages posted are taken from the new GN7 amd1 lol!

wildgoose · May 16, 2012

I've done one or two of these in the past.

Strongly advise to TT every post outlet. It's the safest way of doing things and a benefit is that the multiple rods bring down the overall ZE when they're all in circiut - you won't of course see this value on the test cert because each post outlet should be tested in isolation.

Engineer54 · May 17, 2012

spark 68 said:
The pages posted are taken from the new GN7 amd1 lol!

And Based on What?? lol!!

Engineer54 · May 17, 2012

wildgoose said:
I've done one or two of these in the past.

Strongly advise to TT every post outlet. It's the safest way of doing things and a benefit is that the multiple rods bring down the overall ZE when they're all in circuit - you won't of course see this value on the test cert because each post outlet should be tested in isolation.

Not sure i understand your reasoning here?? If all the rods are solidly linked via the SWA cable(s) as they should be. Why would you test each post in isolation?? (eg ...using the value of the single rod, with the linking to the rest of the system disconnected) Pretty pointless linking the multiple rods, if your going to disconnect them for testing. The whole idea, is to bring the Ra level way down, to make the campsite earthing at each post as good as it can be. Done properly you'll be at, or very close to TN values with the RCD's virtually providing additional protection...

So Yes, each rod should be individually tested when installed, and also possibly during each annual out of season testing. But ''Never'' when your testing the overall installation, at post locations!!

boberty · May 18, 2012

just had a look in regs and it says you cant earth the outlets to a pme system, they have to be connected to a rod 708.553.1.14/ 708.411.4

Engineer54 · May 18, 2012

boberty said:
just had a look in regs and it says you cant earth the outlets to a pme system, they have to be connected to a rod 708.553.1.14/ 708.411.4

Errrr, That's why were talking about TT systems here. Where did anyone mention distributing PME in this thread???