Data cables in thermal insulation

The same considerations apply as to a power cable in insulation - namely that the removal of heat is restricted. However, with the possible exception of power over Ethernet, none of the things you have listed are likely to require the cable to dissipate significant heat, as the signal currents are very small,.  Ethernet for example is a maximum of +/- 2.5V into 50 ohms, about 50mA (0.05A).  Most fire alarm systems are a few tens of mA depending how many points are connected, except when sounding, and at that point things are probably getting warm out side th4e insulation as well anyway.

From a regs point of view, so long as you take the influence of the insulation into account, and are happy the cable will not be damaged by it, it's fine.

Mike.

The same considerations apply as to a power cable in insulation - namely that the removal of heat is restricted. However, with the possible exception of power over Ethernet, none of the things you have listed are likely to require the cable to dissipate significant heat, as the signal currents are very small,.  Ethernet for example is a maximum of +/- 2.5V into 50 ohms, about 50mA (0.05A).  Most fire alarm systems are a few tens of mA depending how many points are connected, except when sounding, and at that point things are probably getting warm out side th4e insulation as well anyway.

From a regs point of view, so long as you take the influence of the insulation into account, and are happy the cable will not be damaged by it, it's fine.

Mike.