Singles in conduit. Domestic

[bernardgreen]

Wiring for ceiling lights in rooms under a thatched roof.

Intend to protect cables wih conduit. Therefor considering singles for ease of instal.

Each light will be supplied direct from a central control unit where relays responding to ELV wired switches ( and other controls ) will switch the 230 volt to the lamps

Is tri-rated single acceptable under BS7671 ? One electrician says it is and another says it must be double insulated singles. In which case 1mm twin and earth might as well be used..

ELV wired switches to allow small diameter cable causing minimum disturbance to the conservation protected walls of the grade II listed building.

 

[ban-all-sheds]

Is tri-rated single acceptable under BS7671 ?

Of course, but it's a bit pricey.

What's wrong with boggo standard 6491X?

One electrician says it is and another says it must be double insulated singles.

The other one has obviously never done conduit installation in his life. Stop listening to him.

ELV wired switches to allow small diameter cable causing minimum disturbance to the conservation protected walls of the grade II listed building.

Wireless?

 

[bernardgreen]

Wireless would ( probably ) work but interfacing it to the switches and the control module would be more complicated than the razor blade chasing on the walls for small cables or individual wires.

Switches will be recondiitioned old toggles on wooden patresses if I can find them. There will also be modern panels but these will for the most part be out of sight,

Control unit is a bespoke programmable unit that will provide other functions.

Tri-rated was considered as I have a considerable amount left over from a recent project ( industrial control system )

 

[Paul_C]

another says it must be double insulated singles

Nonsense. Single-insulated in conduit is perfectly acceptable.

 

[bernardgreen]

another says it must be double insulated singles

Nonsense. Single-insulated in conduit is perfectly acceptable.

That is what I thought.

 

[rebuke]

Was the one who said it must be double insulated perhaps under the impression that it was not all going to be in containment, as obviously in that case he is correct - if it's running 'free' as it were then it does need to be double insulated...

 

[ricicle]

Double-sheathed

 

[ban-all-sheds]

Insulated and sheathed.

 

[Steve]

Would anyone agree that installing SI singles in domestic could lead to dangerous situations in future when a householder alters the wiring and doesn't fully understand the implications of not double-insulating these "strange" wires, and that they "must" be in conduit?

 

[bernardgreen]

I accept the point of singles possibly confusing someone later. This can be avoided by creating a folder of design and install notes and ensuring it can be refered to by anyone working on the system after I sell ( or otherwise ) leave the cottage.

It seems strange that few properties have "route maps" of the cabling around the property.

 

[Paul_C]

Would anyone agree that installing SI singles in domestic could lead to dangerous situations in future when a householder alters the wiring and doesn't fully understand the implications of not double-insulating these "strange" wires, and that they "must" be in conduit?

Quite possibly, but then the same could be said for any number of things unless one designs down to the lowest common denominator of what somebody with very little electrical knowledge might do later.

 

[TicklyT]

Would double insulated (or insulated and sleeved wires) be required if LV and ELV services shared the same conduit?

 

[holmslaw]

..

 

[Paul_C]

And fire alarm circuits should not share a conduit with other LV power.

 

[ban-all-sheds]

unless one designs down to the lowest common denominator of what somebody with very little electrical knowledge might do later.

Based on the evidence from this site, that LCD would be no electrical services in the house at all.