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Hi there
I am going to replace a outside light. The circuit is fed from a sfcu spurred from ring socket circuit. Do I need to check the end to ends and figure 8 checks on the ring, or is r1+r2 and insulation tests and other standard tests for spur and light point satisfactory.

Also for another job, TT system, measured ze is 5.44ohms from earth cable at consumer unit, so adding 21ohms for supplier, falls well below 200 so can I put 26.44 ohms on my form as the earth electrode resistance or do I put lim.
also on this job, has an old Wylex four rewireable fuse board external 30ma RCD, 3cables going into one 30A fuse, looks in good condition, wiring looks good, and low usage household, so as long as all my tests stack up, the board can stay?

The few jobs I have looked at so far all have had 10mm earthing and 10mm bonding, Do I have to replace the 10mm earthing with 16mm if I am doing any work on the installation not 100% sure on regs for this.

Many thanks.
 
Hi there
I am going to replace a outside light. The circuit is fed from a sfcu spurred from ring socket circuit. Do I need to check the end to ends and figure 8 checks on the ring, or is r1+r2 and insulation tests and other standard tests for spur and light point satisfactory.

Also for another job, TT system, measured ze is 5.44ohms from earth cable at consumer unit, so adding 21ohms for supplier, falls well below 200 so can I put 26.44 ohms on my form as the earth electrode resistance or do I put lim.
also on this job, has an old Wylex four rewireable fuse board external 30ma RCD, 3cables going into one 30A fuse, looks in good condition, wiring looks good, and low usage household, so as long as all my tests stack up, the board can stay?

The few jobs I have looked at so far all have had 10mm earthing and 10mm bonding, Do I have to replace the 10mm earthing with 16mm if I am doing any work on the installation not 100% sure on regs for this.

Many thanks.

Why would you add 21 ohms for supplier????????? Your meter just gave you the Ze didn't it? This is method 2.
 
and 5.44 ohms looks as if bonding may still be affecting the reading. did you dis. the main earth from MET before measuring Ze?
 
Yes, reading is with earthing conductor removed from MET. test carried out with just cable to earth rod, for TT 5.44 is low isn't it? what would you expect to get on TT system?
 
Hi there
I am going to replace a outside light. The circuit is fed from a sfcu spurred from ring socket circuit. Do I need to check the end to ends and figure 8 checks on the ring, or is r1+r2 and insulation tests and other standard tests for spur and light point satisfactory.

We had this discussion a few days back. If you read the notes in the Regs regarding a MEIWC you will see it says
Appropriate Inspection and Testing, however, should always be carried out irrespective of the extent the work undertaken"
So you like for like replace of replacing a light, you need only do what tests you feel are adequate, and that is perhaps the Zs, and it is is RCD protected, then Zs of 1667 and the RCD operation tests
Also for another job, TT system, measured ze is 5.44ohms from earth cable at consumer unit, so adding 21ohms for supplier, falls well below 200 so can I put 26.44 ohms on my form as the earth electrode resistance or do I put lim.
also on this job, has an old Wylex four rewireable fuse board external 30ma RCD, 3cables going into one 30A fuse, looks in good condition, wiring looks good, and low usage household, so as long as all my tests stack up, the board can stay?

The few jobs I have looked at so far all have had 10mm earthing and 10mm bonding, Do I have to replace the 10mm earthing with 16mm if I am doing any work on the installation not 100% sure on regs for this.

Many thanks.

You could be getting a reading from a PME system in the area, which is why you can get a low reading sometimes on a TT rod.
 
Don't think it would be classed as a limitation Spin more like a SoI where you would have a N/A

I would advocate if your doing an addition or an alteration to the installation that you need to do all the essential tests, but if it is a like for like replacement, where you don't have to even issue a Cert, then I can see no problem with just carrying out certain tests, such as a Zs and not a full EFLI or IR test, unless of course you had concerns about the installation.
 

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