A 30 mA R.C.D. may not limit the fault current magnitude  to 30 mA or less. The fault current will be limited by the fault resistance path. The R.C.D. will though in most cases reduce the shock period duration.

Z.

Indeed, but the RCD will never disconnect a current of less than its trip threshold, between 15mA and 30mA, and that is the current that is assumed safe to flow for ever.  And as I think RCS it pointing out, there will be some folk for whom that assumption that they can stand up to 29.5mA for ever is in fact not true. Most of us in fact. But the good news is that most earth faults are not in this tricky range and are either a near-instant RCD trip, or not likely to threaten life.

Mike.

Is this a product advertisement? It seems a little out of place in this thread, unless I've missed something?

Why advertisement if it is possible to build safer, simpler and safer as we will see in the picture.

But this has nothing to do with the discussion in this thread, which is to do with earthing arrangements, and not mechanical protection of tethered charging cables?

Why not related?
This is a project that will contain some cargo in the parking lot in the basement of the building and seeks assistance regarding guidelines for a grounding arrangement and I suggest according to a diagram how to do this easily and simply.
My explanation contains the professional knowledge for installing cargo.

Benyamin Davodian said:

This is a project that will contain some cargo in the parking lot in the basement of the building and seeks assistance regarding guidelines for a grounding arrangement and I suggest according to a diagram how to do this easily and simply.

Please could you let me know what I've missed - how doesthe ramp shown relate to earthing arrangements for the charging equipment or charging point?

We are all here to contribute and learn, and it's important to know what I've missed.

Good evening gkenyon,
Explain: When there is a fault in the flow of electricity, the electricity may leak out of the appliance. The nature of electricity is to reach the ground, so in such a situation, since the human body carries electricity, every person who touches the electrical device is a path for the electricity to reach the floor and this is why there is the ramp that covers the cable to the ground. The function of the ground cable is to be an "escape route" that allows electricity to flow to the ground in the event of a fault, in other words - instead of the electricity flowing through the person and reaching the floor, it flows through the ground cable and thus prevents electric shock.

There may be a misunderstanding, but I presented my position according to my professional understanding of the matter, so I presented a more convenient construction chart, because each person can express his opinion but others do not have to accept that it is also acceptable.

Agreed ... in part. Such mechanical protection will not address earth faults in the vehicle itself, or the charging equipment.

This thread is talking about a particular arrangement of earthing in the supply to the electrical installation, that is used in the UK, called PME, and some restrictions we have in legislation and our national wiring code, BS 7671, on the use of PME supplies.

I asked the question about advertisement, as we have had a number of occasions in the past on the Forum, where people have "piggy-backed" onto a discussion to advertise products.


Please could you share the standards that this ramp is made to, that identifies the grade of mechanical protection offered to the cables, and the tests performed to prove that? We have some specific requirements in the UK about cable containment and protection, and installers would require that information.

Fixing the mobile ramp made of rubber or white from Triflex Asphalt Repro - a strong and durable material used to create a quality ramp with a high carrying capacity.
The tests performed to prove this you can contact a civil engineer and get the answer.
I am a mechanical engineer specializing in the vehicle and I gave an interview and no publicity, so I can not answer you the question that is not in my professional field and it is a question that is more about a civil engineer.