AJJewsbury:1. Broken positive conductor.
2. Broken negative conductor.
3. Short between the two above.
Earth NOT needed in all three cases.
What about a nail through two cables running together? Shorting one say +ve conductor to the same of another circuit will likely not trip/blow anything but will likely result in mis-operation.
Hopefully the fire alarm panel would recognise this as a fault and show such by a fault light and/or buzzer. A case for bright red cables and surface wiring I think to reduce the risk.
Z.
AJJewsbury:1. Broken positive conductor.
2. Broken negative conductor.
3. Short between the two above.
Earth NOT needed in all three cases.
What about a nail through two cables running together? Shorting one say +ve conductor to the same of another circuit will likely not trip/blow anything but will likely result in mis-operation.
Hopefully the fire alarm panel would recognise this as a fault and show such by a fault light and/or buzzer. A case for bright red cables and surface wiring I think to reduce the risk.
Z.
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