On Thu, 26 Jan 2006 13:21:50 -0000 someone who may be "Blair"
wrote this:-

The metal junction box is at the pump end of the cable and the metal
protection

I assume you mean the armour.

is connected to the gland which is used for the cable. If I
replace the metal box with a plastic one this gland will not be in contact
with any metal

The gland will not be in contact with any metalwork forming the box
(as the box is now plastic), though it will still be in contact with
the armour.

and therefore not earthed..

That does not follow at all, assuming that the armour is earthed at
the origin of the cable.

Is there an earth rod at the pump end? If there is then all sorts of
other considerations apply.

Is the pump Class I or Class II?

Of course there is an earth wire within the cable. Are you suggesting that
the metal protection should be connected to this earth?

The armour should be earthed. How this is done depends on a host of
things. What sort of earthing system is in use?

Why do you want to change the box? Do you think you are skilled
enough to do so?


--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54