Shower Cable

[uksparks]

I think id be more concerned about one of them being disconnected then overloading the remain one.

 

[Richard Burns]

I'd be interested to know if there's actually a reg that forbids it in the UK, I know there isn't in our domestic regs. As said already, it's common practice with cables in larger distribution networks but the logistics of ensuring identical lengths, routes and connecting a parallel cabled domestic final circuit would make it a bad idea.

BS7671 specifically permits paralleling cables, with certain provisos on cable route, type, etc. to ensure equal current sharing.
However I believe it is directed mainly toward the larger cable sizes in reality.

 

[davesparks]

I think id be more concerned about one of them being disconnected then overloading the remain one.

That's kind of why there is specific guidance on the design and protection of parallel feeds in bs7671

 

[vjsmarwick]

You will not need to worry in another few years because of the EU the power of vacuum cleaners are being restricted next they are going to restrict our power tools so soon your showers will be a maximum of 3KW and you will have a fine mist spray to that you reduce your need for so much water and then to round it off your bath towels will be the size of face cloths ! pmsl

 

[Leesparkykent]

You will not need to worry in another few years because of the EU the power of vacuum cleaners are being restricted next they are going to restrict our power tools so soon your showers will be a maximum of 3KW and you will have a fine mist spray to that you reduce your need for so much water and then to round it off your bath towels will be the size of face cloths ! pmsl

It's already in action. Companies are prohibited from manufacturing or importing any vacuums with motors above 1,600 watts and will have a further reduction in 2017 to 900 watts. What a joke lol.

 

[R G]

Cant see why the op doesn't go for 2 x 8Kw showers side by side with a 6mm T&E for each, LOL....

 

[baldsparkies]

And not 1 person as mentioned the common practice of connecting 2 x 2.5mm cables 2 a 32A breaker !!
Sound familiar !!! :icon12:

Yea but! no but! yea but!

 

[stevethesparks]

Cant see why the op doesn't go for 2 x 8Kw showers side by side with a 6mm T&E for each, LOL....

As long as the two pull cords are tied together to ensure isolation of both at the same time.

 

[Slowhand]

How would you test it? As a radial or a ring final circuit?
I'm not sure the resistances in parallel are such a good idea either.
Might be a good idea to check the fire insurance.

 

[Richard Burns]

A parallel circuit would be tested as a radial (possibly once for each cable), a circuit without identical conductors on the same route would be tested as a ring but must be constructed in accordance with the regulations with are fairly limiting on available design options and is generally not recommended except for the exception class of a ring final socket circuit.

 

[davesparks]

How would you test it? As a radial or a ring final circuit?
I'm not sure the resistances in parallel are such a good idea either.
Might be a good idea to check the fire insurance.

It is a radial circuit so you test it as such, where possible I would test each cable seperately for continuity to confirm that they are all the same.

 

[davesparks]

And not 1 person as mentioned the common practice of connecting 2 x 2.5mm cables 2 a 32A breaker !!
Sound familiar !!! :icon12:

Yea but! no but! yea but!

You are obviously referring to a ring final, which is not the same as cables run in parallel.

 

[Flanders]

And not 1 person as mentioned the common practice of connecting 2 x 2.5mm cables 2 a 32A breaker !!
Sound familiar !!! :icon12:

Yea but! no but! yea but!

You have a point athough as mention we would not consider parrallel cables in a domestic installation It just sounds crazy to do this but technicaly speakng surly a ring final circuit is in affect a parrallel circuit from a certain point a view :shades_smile:

 

[davesparks]

You have a point athough as mention we would not consider parrallel cables in a domestic installation It just sounds crazy to do this but technicaly speakng surly a ring final circuit is in affect a parrallel circuit from a certain point a view :shades_smile:

Nope, a ring circuit is a ring not a parallel circuit which is a radial.

 

[Flanders]

Yes i know that but ok you have 1 twin 13amp socket fed by 2 x 2.5mm cables on a 32 amp rcbo both cables run the same rout so is that a radial or a ring
final ?

 

[DPG]

It's a radial, but with doubled-up feed cables surely. Daz

 

[Flanders]

Ok leading on from that could you just run one 2.5mm cable supplying 1 double 13amp socket from a 32 amp rcbo?, afterall the cable with have the same over current protection as a socket spured off a ring final circuit.

 

[DPG]

I don't see how that relates to the question of doubling up cables? Daz

 

[Flanders]

It doesn't sorry for going off topic it is just somthing i have come across from time to time and athough it does not seam right i cant see that it would be unsafe

 

[davesparks]

Yes i know that but ok you have 1 twin 13amp socket fed by 2 x 2.5mm cables on a 32 amp rcbo both cables run the same rout so is that a radial or a ring
final ?

That's a radial formed from two cables in paralell