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Any installer anywhere.
Discuss New sub board for shed swa advice. in the UK Electrical Forum area at ElectriciansForums.net
Right now, I’m sat in my bungalow.Any installer anywhere.
Someone installed the work, and if they did this as part of a business, which we are discussing, not DIY, then the installation works and the requirement for compliance with EAWR of the installation was there when it was installed, thus the installer was required to comply with the law of the land as per EAWR & HASAWA.Right now, I’m sat in my bungalow.
I cannot (unless I look in a mirror) see any installers.
Why would my electrical installation have to comply with EAWR or HASAWA?
Ok, how about a supply to an outside socket or shed where you're coming from an existing socket on a RFC, plasterboard walls so you put in a single dry lining box for a DP switch or SFCU and drill through to outside behind the box, how do you earth the armour at that termination ? Yes I know you could terminate into a box outside but why create another unnecessary connection when you can earth the armour at the other end ? Or you could have an insulated CU to take your SWA from with no space around it for an additional connection box and no way of drilling a 20mm hole into it.
So you may end up with a metal consumer unit connected to a TT arrangement with a Zs of up to 1667 ohms for example, fitted adjacent to a metal adaptable box to which the swa is terminated with a Zs of perhaps .35 ohms. Is that right?
But it still doesn't say which ends it should be connected ....
Precisamundobut the argument is not about earthing the protective conductor, is it? it's about earthing the armour when said armour is not used as cpc.
If you are going to use that as an argument for earthing at both ends then you would have to apply the same argument to all radial circuit cpc's as damage may result in partial or complete loss of earth to part of the circuit.No it doesn’t say specifically which end of an SWA cable must be earthed if it is done at only one end, it says what must be achieved by the earthing. These regulations assume that we have enough sense to apply them correctly and don’t need a step by step guide to every little detail.
So the regulation basically says that the armour must be earthed to prevent it becoming charged (either through induction, capacitance or touching something which is live) in normal service or under fault conditions.
In normal service it wouldn’t matter which end is earthed, however under fault conditions such as physical damage it is possible that several armour strands could be broken. This could lead to the armour on the live side of the damage being unearthed if the connection was only made at the load end.
Exactly why high integrity earthin requires a second CPC.If you are going to use that as an argument for earthing at both ends then you would have to apply the same argument to all radial circuit cpc's as damage may result in partial or complete loss of earth to part of the circuit.
Not all scenario's are sufficiently likely to be worth allowing for.
Don't think earthing a cables conductive part is classed as requiring high integrity earthing.Exactly why high integrity earthin requires a second CPC.
My reply was in response to your statement about applying the argument to radials and damaged CPCs.Don't think earthing a cables conductive part is classed as requiring high integrity earthing.
I don't understand your argument here to be honest. You have got to gland the SWA to something have you not?? So just earth it at that point. I often use a Wiska box on the outside wall, not forgetting the danger 230V labelOk, how about a supply to an outside socket or shed where you're coming from an existing socket on a RFC, plasterboard walls so you put in a single dry lining box for a DP switch or SFCU and drill through to outside behind the box, how do you earth the armour at that termination ? Yes I know you could terminate into a box outside but why create another unnecessary connection when you can earth the armour at the other end ? Or you could have an insulated CU to take your SWA from with no space around it for an additional connection box and no way of drilling a 20mm hole into it.
I don't understand your argument here to be honest. You have got to gland the SWA to something have you not?? So just earth it at that point. I often use a Wiska box on the outside wall, not forgetting the danger 230V labelOk, how about a supply to an outside socket or shed where you're coming from an existing socket on a RFC, plasterboard walls so you put in a single dry lining box for a DP switch or SFCU and drill through to outside behind the box, how do you earth the armour at that termination ? Yes I know you could terminate into a box outside but why create another unnecessary connection when you can earth the armour at the other end ? Or you could have an insulated CU to take your SWA from with no space around it for an additional connection box and no way of drilling a 20mm hole into it.
No you wouldn’t, you can’t have exposed metal connected to two different earthing systems like that. You insulate the armour at the load end of the submain so that it does not introduce another potential.
Also leaving a TT system with such a high Ra is unacceptable.
I am fully understanding the situation, and this is not just my opinion it is that of many others, and other organisations.I think your problem is that you are confusing a ‘task of work’ with a ‘domestic installation’.
If no task of work is being conducted, neither the HASAWA or the EAWR applies.
If a task of work is being conducted the HASAWA and EAWR would apply to that task, not to the domestic installation.
It may be that the task of work is to make safe a dangerous condition in the domestic installation.
How would such a task be able to be conducted if the domestic installation must first comply with HASWA and the EAWR?
Reply to New sub board for shed swa advice. in the UK Electrical Forum area at ElectriciansForums.net
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