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  1. C

    What is this black cylinder/tube?

    There isn't any date on the side unfortunately just plain black all the way around and no raised lettering etc. The only information is a label inside the box, however the company doesn't seem to exist anymore. Pictures of label and black tubes, one showing some melting at the end
  2. C

    What is this black cylinder/tube?

    Thanks again for your help and advice.
  3. C

    What is this black cylinder/tube?

    There is temperature control which is like a light dimmer switch. The box would usually be closed and not easily opened, beyond being a junction box I've no idea specifically what it is for. Strangely changing the position of where the black tube sits within the box (previously resting near a...
  4. C

    What is this black cylinder/tube?

    Thanks for the response, really appreciate it. There are 4 plug sockets and 8 spotlights running through that junction box too. But it's only the heater that causes the cracking and popping in the junction box.
  5. C

    What is this black cylinder/tube?

    Hi all, I have an outdoor junction box, cables from which supply an outdoor hanging heater. When the heater is on, after approx. 2 minutes popping and crackling noises come from the junction box. Inside the junction box are two small black cylinders with black and earth wires into them. One...

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