Mains Prover / and calibration checks

[Chri5]

It's been suggested that I need a mains prover to verify the mains test calibration of my 1651 Fluke.

Do I need one and if so, what should I get and where from?

Also I understand that I'm meant to keep a calibration record (and test every 3 months) that the tester is reading correctly.

Is this the only alternative ?

Quote from the NICEIC

What the NICEIC say about instrument accuracy:

It is essential to ensure the accuracy and consistency of test instruments used to carry out the range of tests and measurements required for BS7671 for certification and reporting purposes.There should be a system in place which enables confirmation of the continuing accuracy and consistency of all test instruments used for certification and reporting purposes.

As always, thanks for any help.

 

[nozspark]

The NICEIC do like you to have a method of proving the accuracy of your instruments.

I have just recently passes my Part P assesment with the NIC and I have a home made version of the cal check box - I used an IP box with banana sockets and various resistors which allow me to test

RESISTANCE @ 0.5 ohms, 1 ohm, 10 ohms and 100 ohms
INSULATION @ 0.5Mohms, 1 Mohm, 10 M ohms and 100 Mohms

I also have a nominated socket (not RCD protected) to test Zs and a plug in RCD

Carry out these proving tests monthly - the readings do not need to be accurate, they just have to be consistant from one month to the next.

As for a mains prover, you only need one to prove safe isolation; however you could just use the incomming side of the isolator!

The above box cost me about £17 (I could have sourced the items cheaper !); in the end I got some hard to get resistors from a local TV repair man