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Use decorators caulk to seal the gaps. Jaymack

If the cable is run in the safe zone as mentioned already, there is no need for any protection for this cable. Capping is advised where someone else is doing the plastering later to avoid trowel damage. Chiselling into the brickwork is to be avoided for cable runs, since it weakens the building...

I finally cracked it with help from the maker: - Opella. They sent me a couple of parts for a simple modification to make the valve less sensitive. Now: - no noise and no hammer. Jaymack

I want to replace the ball float valve, in the main cold water tank. I need a quieter one since it is above a bedroom. I have tried a Torbeck, it is a lot quieter when filling; but I now have introduced a water hammer problem, mostly when shutting off. The cause of this hammering, is due to...

To add to the topic. For TT installations, where there is a main time delayed RCD (with typical EF trip currents of 100 to 500mA), in addition to another downstream (say 30mA EF trip current for sockets etc), it is necessary to ensure time discrimination. A 3:1 discrimination ratio is...

OSG Page 24: - 4.2 "For 100A TN installations, the main earthing conductor csa needs to be 16 sqmm and that of the main bonding conductors 10sqmm where the size of the supply neutral conductor is not more than 35 sqmm" etc. and OSG Page 161 Table 10A for 50 sqmm supply neutral conductor. Jaymack

For the record, the size of the main equipotential bonding conductor is dependent on the size of the supplier's main fuse, 10 sqmm is ok for 60 to 80 A but 16 sqmm is reguired for 100A. Modern electricians? There is up to date; and not so up to date electricians, IMO, the latter should not...

S = Time delay. Jaymack

The MK site doesn't list this item number, is it a voltage operated ELCB?, (these are no longer acceptable and may be a reason for your problems). Can you post all the details on the existing unit or post a photo? if a voltage operated ELCB, there should a tail connected to earth. Jaymack

There is no additional bonding required; but check that there is a main earth bond, to the water and gas, main incomng service pipes to the main earthing terminal at the consumer unit. Jaymack

The correct abbreviation for this cable is VRI: Vulcanised Rubber Insulated. Jaymack

Max Core Sizes for SO's Clause 11.5 of BS1363-2 states: "Line and neutral terminals in fixed socket-outlets shall permit the connection, without special preparation, of one, two or three 2.5 mm2 solid or stranded; or of one, or two 4 mm2 stranded conductors." Do MK exceed this? Jaymack

My previous post refers: - Sorry, I misread your question. It is preferable to test for insulation values and Zs at least, on the circuit that you are proposing to work on. You then have a record of before and after your work. If there is a problem with the results, and you have no record...

Read this guide for isolation procedures: - http://www.niceic.org.uk/downloads/Pocket%20Guide%205.pdf You would be breaking the EAWR 89 regulations, if you are a contractor. Jaymack

Solution is: - http://www.screwfix.com/app/sfd/cat/pro.jsp?id=23064&ts=72989 2 Gang 30mA rated tripping current control circuit. Jaymack

This is probably what you are looking for. 461-01-03 Where an item of equipment or enclosure contains live parts that are not capable of being isolated by a single device, a durable warning notice shall be permanently fixed in such a position that any person before gaining access to live parts...

This will help: - http://www.iee.org/Publish/WireRegs/WiringMatters/Documents/PreIssue14/1999_6_autumn_plastic_pipes_to_bond_or_not_to_bond.pdf Jaymack Sometimes I sits and thinks; and other times I just sits.

Read this article: - http://www.iee.org/Publish/WireRegs/WiringMatters/Documents/PreIssue14/1999_6_autumn_plastic_pipes_to_bond_or_not_to_bond.pdf Jaymack

Does the guy who gave you the quote speak good english? Jaymack

Go for a room occupancy sensor, in place of the pull switch, no noise. For sourcing, try a local wholesaler or screwfix, maplins etc Jaymack