50mm is 50mm and it does not matter if the 230V cables are single or double
You might have to be more specific. Remember that 230V is classed as low
Telephone wires are treated differently to ELV cables (eg 12-24V boiler
controls) as they are liable to put 230V into a BT line.
Mains and comms cables - to prevent interference on the comms.
It finally made it into the regs just as comms cables and protocols
were designed to be immune from such noise, and as such it's pretty
pointless for things like ethernet, although I would still be
concerned with a broadband connection because they operate right
up to the limits of the chipsets driving them, and noise can have
significantly detrimental effects in that scenario.
The separation from gas services has been there much longer.
[email address is not usable -- followup in the newsgroup]
On Sunday, 16 August 2015 14:03:06 UTC+1, email@example.com wrote:
Sheathing is irrelevant as it's not insulation; sheathing's there to protec
t the insulation from physical damage, which should not occur within condui
t or trunking. Therefore cables in conduit or trunking need not be sheathed
A physical barrier is required for cables of different classes sharing a co
nduit or trunking etc unless both cables are insulated for the higher volta
ge. This is, I assume, because within conduit or trunking there will be pla
ces where insulation is removed from one class of cable to enable connectio
n to terminals etc., and separation of circuits therefore relies on the ins
ulation on the other circuit.
AFAIK the 2" recommendation for distance between phone and mains cables was
to reduce hum and interference on the phone line. For alarm cables there m
ay be a vulnerability leading to false alarming from spikes on the mains in
ducing spikes on the alarm wiring. It is not required for electrical safety
. The mains cables outside conduit or trunking are insulated, and that insu
lation is protected from damage by sheathing. They are electrically safe if
you run your hand over them, and they are electrically safe if you run an
alarm wire next to them.
No, but it's not supposed to. In fact it would be better if the alarm cable
broke down quickly and shorted to earth, tripping the protective device.
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