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Type C breakers are used for high starting/inrush current`s or like me,if the supplier has run out of type B`s :roll: getting hold of type B RCBO`s is a mare at the moment. The only real problem is the allowable max Zs`s of these type C`s Example... Type B 32A BS7671 states a max Zs of...

Got back to the office today to hear of a strange problem some of our guy`s were called to...any idea`s? A house converted to two flat`s,one up,one down. Each flat has been given it`s own supply TNC-S and each flat has a consumer unit,metal clad with 100A 30mA main isolator. When the...

Yes what your plan is sound. Even if half of the circuit is covered in *earthed metal and half isn`t then the whole circuit still needs RCD protection,which you have. * metal capping does`nt offer good protection from nails,so in my eyes fails on this need.

Gary .....how did you get to that figure of 95A ? where should i be looking?

I get you now.... :roll:

*OVERLOADS or shorts :(

Very true Gary ...If the FCU was replaced with one with integral RCD. However if the op just extended the circuit from a standard FCU then any earth faults would zip past the BS1362, as they will only pick up over currents or shorts .

I work for my local council doing PIR`s on voids and since i started i come across borrowed neutrals at least once a week (on installs 10 years plus) .....NIGHTMARE !!!!

As near as practicable, so if the only part of the pipe that you can strap an earth clamp around, comes up through the floor either 3 or 30 foot from the meter then that`s good enough for the reg`s .

As long as the Zs reading at the furthest point in your soon to be extended circuit does`nt excede the value stated for the mcb/fuse which is protecting the original circuit that your fcu is on, in BS7671 then there is no reason why you can`t do what you plan to do. You could always play it...

Hi Alan That tool in your link is for removing morter from around a brick,not for cutting into brick directly.

Many a T.T installation were protected by a single RCD as an incomer,albeit 100mA t.d :lol: :lol: :lol:

The tricky part in this project is gaining access to the joists above to be able to drill holes where cables will pass through. Cable running parallel with the joists are the easy ones but trying to drill holes through the joists where access is a problem pushes the price up as it`s so time...

It is the best way coops or you could fit child safety plug inserts that will stop those wondering fingers.....Ikea do them in packs of 12 or so for a few pounds. http://www.ikea.com/gb/en/catalog/products/40098957

Try searching for `plinth lighting` keith as B&Q and wicks` both do them.

Secure.... Where did you do the course ? Was it up here in Manchester?

I have never come accross your situation before but as long as the BS3036 fuse in your CU is rated at the lowest rated conductor in the circuit then i can`t see thier being a problem. Depending on rating factors (one your stuck with is the 0.725) then if your 15A should be fine for the 2.5mm...

Equitum.....Its all about removing the load from the source and a DP switch will do this. Keep in mind though that an MCB only dissconects the line conductor,leaving the neutral still connected.

Think your getting a little bit confuddled here... A DP switch is acceptable as a means of isolation to be able to carry out maintenance work on an item of current using equipment hence a DP switch installed on a shower circuit is acceptable as a means of isolation. Same applies to a 20A DP...

Thanks for the responces..... MDPE...is that the blue coloured pipe ive seen? I also suppose using this type of pipe would negate the need for main earth bonding in the garage. MANY THANKS AGAIN