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Max Amps/voltage Down These Cables


J_G

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What's the max voltage and amps that can be sent down the following?

6 core Alarm cable....(does it affect the max voltage and amps If doubling up and is it correct if you double up? Or is it a no no?)

0.75mm flex...

1.0mm twin and earth....

1.5mm twin and earth....

2.5mm twin and earth....

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Correct Fozzies,unless your connecting your t+e directly to a 10 kv substation that's the assumed voltage.

That's why the distribution network is HV, as James I squared R losses.

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Without consulting the big red book Off the top of my head,

1mm around 10 amps

1.5mm around 16 amps

2.5mm around 26 amps

All dependent on clipping method/materials etc.

That's the important bit. Cable in plaster and cable in open air have two different values.

Also the question didn't state AC or DC.

I thought Twin and Earth was rated to 600V?

Rated voltages are normally in RMS values.

As for alarm cable is it a signal cable.

Rated at 1 amp per core and 50v RMS.

It is recommended to double/triple up on cores for power to reduce voltage drop.

If you can't double up both pairs, double up the negative first when using DC.

In an alarm system I wouldn't be expecting to get near the max values due to the battery capacity and rating of the PSU.

Resistance and Voltage-drop are the problem here.

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  • 1 year later...

affaik stranded alarm cable is/was rated at 1amp @ 50 volts per core, double up to handle 2 amps but don't exceed 50 volts.

Doesnt matter what voltage. But the higher the voltage the less the voltage drop.

http://en.wikipedia.org/wiki/Electrical_resistivity_and_conductivity

can i qualify - as long as the voltage don't exceed the makers recommended voltage, so don't stuff 240 ac down alarm or network cable as example.

as it happens, i tried to get the voltage and current rating for CAT5e, can't seem to find it. question came up about POE cameras, so i think 48 volts DC @ 1amp.

on an american electricians forum (bless Google) one guy stated 2.5 amps no problem

If you think education is difficult, try being stupid!!!!

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