earthing systems for outbuildings

[brightspark]

herehttps://www.youtube.com/watch?v=NvENsVUhDUs

 

[Paulbarrett]

On a similar stance, One of my apprentice bashing in some proper sized rods today for a car charger. The amount of these I see exportig pme is shocking.

 

[brightspark]

is the ground a bad aria using a 6 foot rod most I have had to use is 2 three foot rods separated one 6 foot wasn't sufficient to get it under 200 ohm

 

[Parm]

Honest question

Why do you need a rod in the ground for a charger!

Surely it all works of the pos and neg on the supply

 

[Parm]

On a similar stance, One of my apprentice bashing in some proper sized rods today for a car charger. The amount of these I see exportig pme is shocking. View attachment 167125

Did he have a couple of goes with a hammer then hacked it off with the grinder when you weren’t looking?

 

[bigegg]

im going to hazard a guess, to prevent a big hydrogen explosion in the event that the mains AC somehow shorts straight into a forklift type battery? (or electric car?)

 

[Maker]

Honest question

Why do you need a rod in the ground for a charger!

Surely it all works of the pos and neg on the supply

The earth is on the mains side of the inverter/charger, it's no different to having an earth rod in a shed at the end of the garden. You can only take the earth connection so far from the house before there can be some voltage potential to the actual earth you're standing on. Someone else on here can probably explain it much better than I.

 

[Spark plug]

The rules for car chargers require that an earth rod is installed unless you can guarantee that the neutral and earth remain separate all the way back to the supply transformer.

Which usually isn’t possible, I fact there is only one instance ware I have been able to guarantee this, because the transformer belonged to the customer not the DNO.

 

[dobbslc]

Exporting PME earthing systems! You'd think it was a game between the "engineers" at my firm, the more you can do the bigger the prize!

 

[Paulbarrett]

is the ground a bad aria using a 6 foot rod most I have had to use is 2 three foot rods separated one 6 foot wasn't sufficient to get it under 200 ohm

It is, lobbed one in and it wasn’t adequate, border line, for the sake of a tenner lobbed another one in for good measure, think it came in at 30 ohm or so

 

[brightspark]

worsts I had was up the dales. all rocky ground. had to sink 2 rods in a meter apart and had to try all round the house till I got somewhere soft enough to sink them was well peed off

 

[frank horton]

I never use a hammer.....
Modded a SDS bit, welded a tube on the end so it don't slip then let the drill do the talking....
Easy pasy if there’s no rocks.....

 

[Paulbarrett]

I never use a hammer.....
Modded a SDS bit, welded a tube on the end so it don't slip then let the drill do the talking....
Easy pasy if there’s no rocks.....

Same here but that was on another van

 

[steviec_lj]

Be interested to see what work arounds there are, now all CU’s are required to be metal clad under Amendment 3

 

[brightspark]

Be interested to see what work arounds there are, now all CU’s are required to be metal clad under Amendment 3

in what way

 

[addjunkie]

Be interested to see what work arounds there are, now all CU’s are required to be metal clad under Amendment 3

Dont see the issue with a properly glanded 3 core SWA.

While were on changes what cable clips are folk using in metal incase of fire for the 19th edition

 

[steviec_lj]

CU case is connected to main earth busbar, properly glanded swa will be in contact with the CU case, which in essence exports the earth.

Properly glanded swa at the other end, is in contact with the metal CU, which is connected to the main earth busbar.

You’ve just exported the earth.

Usual was to connect swa at source, and leave the earth link off at the end, and sink a local spike in, which was connected to the main earth busbar.

Or do we not need connect the Metal Clad CU to earth at either end now?

 

[daedalusminos]

Same here but that was on another van

...do you mean not on the "apprentice" van

 

[daedalusminos]

Usual was to connect swa at source, and leave the earth link off at the end, and sink a local spike in, which was connected to the main earth busbar.

I'd be interested to know what the alternative is, if using a metal CU at the remote location I've terminated the SWA in a plastic adaptable first.

 

[addjunkie]

In effect when you gland the swa at both ends you are electrically connecting the two boxes at each end through the armour. And the armour needs to be earthed for the unplanned spade, or digger bucket event.