Am I too fussy?

[philbas]

hey SIdey sorted out how to do subscript

 

[Technician]

Sidewinder; Sorry to be picky or pedantic. Thought the Regs

had it that the current delivered from the meter had to be AT

LEAST 200mA. (612.2.1 page 191 AMENDED edition) :Salute

Is there a minimum current to be delivered during an insulation test?

On the training issue I did have a fascinating conversation with a

guy who was on a safe lifting course and the trainers drew NO distinction

between a metric and an imperial ton. They had done the course for

years like this.

 

[Chr!s]

I have some certs here for a domestic job I'm putting a price together on.My prospective client has recently bought the house, just previous to this there was some electrical work done as follows:

{SIC}

"Replace consumer unit. Upgrade earthing. New ring main & cooker circuit in kitchen. Partial upgrade to earthing on lighting circuits."

With the following comments on existing install:

{SIC}

"No earth to upstairs lighting (cables available in attic). No earth to downstairs light switches (light fittings earthed) Warning notice posted. Would benefit from upgrading throughout."

The cut out is sealed by a DNO sticker, now, but he has an exact description of the main fuse.

The contractor has measured Ra by loop test, thus really "Ze" value not a true Ra.

He has not recorded this in the Ze box on the cert, he has entered N/A, he has recorded this in the Ra box.

OK not such a drama perhaps?

He has then gone on and completed all tests on all circuits, very thorough including r1, r2 & rn on the 2 ring final circuits.

However, there are no entries for Zs for any circuit, they are all marked as N/A.

Any comments?

1) Is the Installation using RCD'S for earth fault protection? If yes then test method 2 GN3(ELI) may be used, the resulting reading is taken as the Earth electrode resistance Ra. So no issue in my mind entering this value in the Ra box. Although i agree it is a Ze measurement, and that's where i would record the measurement.

As for Zs, in my opinion he needs to enter a value as per 612.9, in this instance he has measured not calculated as per appendix 14(more precise method, apparently ) , he has measured the Ze(Ra Test method 2 GN3) and also measured the r1 and r2 or the R1 + R2, so we have a measured value.The total measured value where applicable to that protective device need's to be recorded.(So Ze(Ra Test method " GN3), any distribution circuits(R1 + R2) and the final circuit for example if ring (r1 + r2)/4 )+ Ze(Ra) Test method 2).

Regards Chris