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Lamp failure alarm relay question.


I have a 250 watt 240 volt infra-red heat lamp keeping newly hatched chickens warm.

I need a battery powered alarm to warn of both lamp and mains failure.

I want to use a 240 volt ac relay in series with the lamp such that if either the lamp filament fails or the mains supply fails an alarm sounds.

There is also a dimmer in the circuit. Could anyone suggest a relay suitable and possibly the value of a resistor in parallel with the relay coil to make this work?

Any better suggestions most welcome.     

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