Running Alarm Cables

[arfur mo]

While were being picky ,for all those who did not pick up on it 15 cm is not 1500 mm ,its 6 inches.I knew being a joiner would come in handy lol.

Anyway i cant understand why this thread is going on so long when i answered the o/p question correctly,its just serving to confuse him.

He said that the light switch cable was 6 inches away from his alarm cables,end of.

well spotted young man, it was a typo and so as you know i have a special dispensation to use them in here - being a daft old codger it's my job to make everyone else look good, so i failed again then

regs

alan

[markovitch]

well spotted young man, it was a typo and so as you know i have a special dispensation to use them in here - being a daft old codger it's my job to make everyone else look good, so i failed again then

regs

alan

I'll let you off Arfur,i'm to busy trying to correct my grammar to worry about that lol.

[Guest anguscanplay]

I`m still struggling to understand the significance of less than one metre

[markovitch]

I`m still struggling to understand the significance of less than one metre

Induction is less likely to occur (of any significance)over a distance of under one metre i assume,i dont make the regs sorry...

[amateurandy]

I`m still struggling to understand the significance of less than one metre

Me too. More significant points are:

1. The OP appears to have gone; probably scared off by the meandering and complexity!

2. Induction is much more affected by separation - inverse square law.

3. Referring back it was a light switch cable he was worried about. Now if the light is off there's probably no current so no induction effect.

4. You can always fit a suppressor of some sort anyway.

[Guest anguscanplay]

Induction is less likely to occur (of any significance)over a distance of under one metre i assume,i dont make the regs sorry...

i meant to do with the need for mechanical separation - don`t worry about it

[spider]

Checked with IEE On Site Guide, table 7.3B 'Normal separation distance' 50mm for Band 1 type circuits

[alterEGO]

Me too. More significant points are:

3. Referring back it was a light switch cable he was worried about. Now if the light is off there's probably no current so no induction effect. common/permanent live

4. You can always fit a suppressor of some sort anyway.never design a system to need suppressors or joints ect.

[mjw]

We've had this discussion on here before, how a piece of 3mm plastic is supposed to stop inducement I'll never know, but rules are rules. Ideally best off staying well away from mains but I don't think most customers would like two pieces of trunking 100mm apart like a pair of train tracks.

You are right how is a lump of plastic going to stop inducement??and yep ideally you run l.v cables as far away from mains as possible

[arfur mo]

while some have been having fun it is getting terribly piccy,

in real life that switch cable is not ever going to be a problem, unless it feeds a fridge, washing machine on the way or he gets in a direct contact with, it so time to call it a day me thinks.

so over to you Colin - practice your dark art and put this thread out of it's misery

regs

alan