If you're only using it for straight drops, how long does it take to cut and thread a length of conduit vs how long it would take to cut, bend and pop-rivet thick capping?
things we want made....
- Thread starter ColJack
- Start date
About the same, but then you don't have to chase out a 15mm or so groove in the brickwork to get sufficient depth for conduit..
Plus, limitation on the number of T+E's you can get in a round conduit
There is also the cost issue..
A length of conduit costs more than capping would, plus a male brass bush, coupler and female brass bush..
Plus, limitation on the number of T+E's you can get in a round conduit
There is also the cost issue..
A length of conduit costs more than capping would, plus a male brass bush, coupler and female brass bush..
Protecting lighting switch drops...
If only someone invented a 1-module, din-rail mountable device which provided protection against overcurrent and earth leakage...
If only someone invented a 1-module, din-rail mountable device which provided protection against overcurrent and earth leakage...
£30 for an RCBO... or roughly what you'd spend on capping / oval conduit for the switch drops anyway?... hmmm ?
erm.... hands in the air those diy'ers who have a/. a drill, b/. a hilti c/. cable chaser ...... damn no hand in the air smiley... doh... but i do....
do you do electrics for a living?
if you don't then...
so that's at least 1 in 61 million uk residents...
if you don't then...
so that's at least 1 in 61 million uk residents...
6,098 i think. 
- Joined
- 8 Feb 2008
- Messages
- 435
- Reaction score
- 20
- Country
522.6.6 (i) to (iii) all require that a protective device operates to remove the shock hazard within a specified time. This requires that fault current flows, and on TN systems this can be substantial. The requirements can only be met by specified solutions, i.e specified cables, conduit or trunking. These clauses do not permit the use of metal capping, earthed or not.
The comments about 522.6.6 (iv) are serious - we have no specification to work to other than AG2 or AG3! and this leaves unnecessary doubt. The Electrical Safety Council have, in the past mentioned, 3 mm for safe plate but this is covered by a disclaimer.
So capping is not an option.
I have looked in detail at the cost of conduit on a large domestic dwelling. When everything is accounted for, the cost far exceeds the use of RCDs, and there can be severe limitations due to the building construction (thin walls) and limited capacity.
So in the spirit of the post what we need is a protective measure that can be applied to short sections of PVCTWE that would meet conditions similar to those in clauses (i) to (iii).
This might be some form of metal braid or foil. It must be capable of being earthed, providing sufficient cover (a problem with braid) and surviving short circuit currents long enough to allow time for the protective device to operate.
I wonder if Baco foil are listening
The comments about 522.6.6 (iv) are serious - we have no specification to work to other than AG2 or AG3! and this leaves unnecessary doubt. The Electrical Safety Council have, in the past mentioned, 3 mm for safe plate but this is covered by a disclaimer.
So capping is not an option.
I have looked in detail at the cost of conduit on a large domestic dwelling. When everything is accounted for, the cost far exceeds the use of RCDs, and there can be severe limitations due to the building construction (thin walls) and limited capacity.
So in the spirit of the post what we need is a protective measure that can be applied to short sections of PVCTWE that would meet conditions similar to those in clauses (i) to (iii).
This might be some form of metal braid or foil. It must be capable of being earthed, providing sufficient cover (a problem with braid) and surviving short circuit currents long enough to allow time for the protective device to operate.
I wonder if Baco foil are listening
ooooOOOOooo my mum always said i was special
wont the use of BS8436 cover short runs of t&e to satisfy clause (i)
A lecture from Tony Cable of NICEIC fame that i attended 2 weeks ago categorically supported the use of BS8436 for this situation.
A lecture from Tony Cable of NICEIC fame that i attended 2 weeks ago categorically supported the use of BS8436 for this situation.
Honeywell do a wiring centre that has numbered terminals and banks of terminals for each item, based on a PCB. You cut the links depending on the system. OK for simple and to the book systems.
For larger systems with more valves, more stats, U/F with rads, a couple tanks etc etc, I always use a gewiss box with a metal back plate with dinrail pop rivetted to it, and then 2.5mm or 4mm dinrail terminals. Use the terminal linking strips to provide several common terminals for the neutral, and fit several earth terminals. Use TRS glands for the flex drops, and a hole in the back for rear entry T+E if any. Ideal. Possibly a little OTT for a domestic.....
Perhaps they should sell conduit in set lengths with the bottom threaded already, and the top bushed (or ready to cut and rubber cap fitted).
Perfect for folk with no tools and quicker on site. A couple different lengths depending on ceiling height.
Perfect for folk with no tools and quicker on site. A couple different lengths depending on ceiling height.
I beleive RF Lighting enterprises can supply 20mm or 25mm steel tube pre threaded at any length to suit your needs.
Very reasonable prices too
Very reasonable prices too
DIYnot Local
Staff member
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local
