2 core cable..

[dim_bulb]

spinlondon is just too cool for school

on a realistic point this two core cable where would you get it from? left over under cupboard light cable?

do you think there was a slight debate in the 60s regarding 2 core cable because at the time the fashion was wooden backs,

 

[MDJ]

Ive got some 2 core flex on my van, use it to extend pendants in houses with high ceilings, I suppose we could run it to a table lamp in a restaurant through some soil with plants in it like they do in spain.

 

[ben sparkz]

How can the tester get an r1+r2 reading? its good practise to continue the cpc even though the the item is double insulated. I was taught that you need an cpc to make it easier to test and also to allow for future references i.e change for a metal item at a later date, also live and neutral conductors needs to be the same size. (just in case single and earth was used)

 

[Engineer54]

(just in case single and earth was used)​

​

Pardon????

 

[Crosswire]

Regulation 412.2.4 wouldn't allow the termination of the CPC within the fan into a wago, crimp or terminal block, unless specifically provided by the manufacturer of the fan.

Can you be more specific? In my Regs 412.2.4 is a subject heading "Wiring systems"

 

[Crosswire]

Also, surely terminating correctly is preferable to cutting it off? Why would it be prohibited?

 

[Deleted member 26818]

Sorry should be 412.2.2.4.

 

[jumpin jax]

Its a bit ambiguous really, i read it as the cpc must not be connected to an ECP unless catered for, not you can't terminate in a floating wago, as long as it is marked as a cpc

 

[Deleted member 26818]

If you were to park the CPC in a 'wago' would the 'wago' not then become an ECP, one that was not catered for?
Or in other words not specifically provisioned for in the specifcation for the equipment concerned.

 

[jumpin jax]

Technically yes, but that would mean we would have to put either a maintenance free enclosure to terminate the cpc in and then 2(3) core flex to the fan or an ip44 enclosure near to the fan then flex to the fan, we wouldnt get any work done:frown2:

Out of interest, how do you terminate your domestic fan feeds?

 

[Deleted member 26818]

It's not something that I've come across in domestic installations to that extent, as the fans I use are either SELV or 230V wired with 3core&E.
However, with a bell transformer for instance, I would normally just take 2 cores to the transformer.
Where I've installed class II equipment in commercial or industrial installations, I generally take a CPC to a JB or enclosure near to the equipment, park it, then run 2core to the equipment.
However, there have been times when I've not had that option, and following instructions, have cut the CPC out of T&E or 3core flex then terminated in the class II equipment.

In many instances running a CPC to and parking it in the enclosure of an item of class II equipment is not going to make a blind bit of difference.
The likelyhood of the CPC becoming loose and shorting against a live conductor is just the same for Class II equipment as it is for Class I equipment.
However if that CPC were to come into contact with an exposed-conductive-part it could introduce a difference in potential.
Something that may not be desired if the equipment is installed in certain locations.
It could even allow fault currents from a fault elsewhere in the installation to enter a location where such currents could be present a danger.

 

[Geoffsd]

If you were to park the CPC in a 'wago' would the 'wago' not then become an ECP?

If the wago were 'just there' without the cpc in it, would it be an ECP and require earthing?

Or - If the wago was being used to connect the Line conductors would it be an ECP?

 

[Crosswire]

412.2.3.2 "Except where Regulation 412.1.3 applies, a circuit supplying one or more items of Class II equipment shall have a circuit protective conductor run to and terminated at each point in wiring and at each accessory."

412.2.2.4 "No conductive part enclosed in the enclosure shall be connected to a protective conductor.......Inside the enclosure, any such conductor and their terminals shall be insulated as though they were live parts, and the terminals shall be marked as protective conductor terminals

No exposed-conductive part or intermediate part shall be connected to any protective conductor unless specific provision for this is made in the specification for the equipment concerned"


The first Reg says I have to run a cpc to the fan. Fair enough. Can't see how the second Reg prevents me from terminating the cpc in a wago or terminal block.

Am I missing something?


​

 

[Geoffsd]

.Nope.

 

[Stroppy]

As a connector block or wago is not an exposed conductive part, or part of the equipment at all (merely living in a cavity inside it), then this doesn't count as connecting a CPC to something in a Class2 device.