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Youd be quite surprised. Minus the armour bond it is pretty much the same for a service cable joint. On another note, that constant force spring is the same method how the earth screen is connected to on 11kv and 33kv cables.

Taping or patch is useful if you have to do one live! Also don't need a collar as the resin will go hard and prevent the armours from digging in

It seems PNB systems are open to interpretation. Even the wiring regs book says that a TNS systems can be considered to be TNCS PNB

Have heard of pnb but dont have much dealing wih is as I work U/G, its where the N/E is provided from a point away from the transformer and the premises? Will hold my hands up if that can be classed as tnc-s. But have always been told that for an installation to be given tnc-s it has to be pme...

Then without that multiple earthing it cant be TNC-S as stipulated by the regs. Thats not to say there is an incorrect sticker on an installation. ---------- Post Auto-Merged at 20:58 ---------- Previous post was made at 20:57 ---------- Each joint where the two are bonded an earth tail is sent...

my bad, its shall Protective multiple earthing 9.

[quote name='Andy

Just thought of the exception, swimming pools and petrol stations when there is no separate earth and you have to provide your own. PME supply with tt earthing

On a modern combined neutral earth mains cable, TNC-s supply, each joint along the main has an earth tail coming out of it tying the neutral to earth. Thus PME and tncs. If the original mains cable was separate neutral earth and was converted to pme, joints along that cable will have the...

Am guessing your thinking of an old PILC supply into a property where a modern cutout has been fitted to it?

The bonded earth conductor has to be of a sufficient csa to carry the fault current long enough to trip the main C/O fuse of a fault in the event of the shared N/E not present. Too small a conductor will not provide a sufficent fault current to trip the overcurrent protection. BTW PME and TNC-S...

They're shear off connectors again but you have strip the insulation

Dont wipe joints any more, its all done with mechanical connectors now. The connector on the the top of the joint on the 3rd pic is a shear off connector for the earth screen on a 33kv transition pilcswa to triplex. Just tighten them up with a ratchet and they shear at a pre set torque.

Haha, just a couple. Had my lv 2 2339 exams today which was fun!

Yeah am an apprentice jointer and took em down the training school. The rigs are live simulators that sound an alarm if you go phase to phase or phase to neutral

Some assorted pics. 33KV jointing, lightening vs a street lighting C/O 185 wavecon to 185 PILCSTA breach joint and a 185 wavecon srevice breach