Came across this bit of pyro. It had failed rather spectacularly!!
When pyro seals fail
- Thread starter RF Lighting
- Start date
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You mention a failed seal, was that the cause, I wonder if it was originally pvc served and was stripped overzealously when installed, it could last years before damp penetrated, as you know that stuffs bulletproof normally
Are you sure it's failed seal?
I found a clone of that [still working and tested good] when asked to add some additional stage lighting.
Some 60-80m of 1.5mm² 2core had originally fed the lights and one socket in a junior school hall, it had been repurposed as a 60A submain feeding a CU which in turn fed lights and ring finals in 3 new classrooms used as computer suites, all the sockets and the original 12 or 15 6ft fluo lights in the hall and a Strand Junior8 with 4KW of stage lights.
I clamped it at nearly 60A without anything in the hall being onand it was verging on too hot to touch. I assumed the damage was just down to the cable cooking and cooling on a daily basis.
The school was pyro city and the much darker colour stood out from the rest.
I found a clone of that [still working and tested good] when asked to add some additional stage lighting.
Some 60-80m of 1.5mm² 2core had originally fed the lights and one socket in a junior school hall, it had been repurposed as a 60A submain feeding a CU which in turn fed lights and ring finals in 3 new classrooms used as computer suites, all the sockets and the original 12 or 15 6ft fluo lights in the hall and a Strand Junior8 with 4KW of stage lights.
I clamped it at nearly 60A without anything in the hall being onand it was verging on too hot to touch. I assumed the damage was just down to the cable cooking and cooling on a daily basis.
The school was pyro city and the much darker colour stood out from the rest.
I would not have thought it was a seal failure caused that, it more likely a breakdown of the cable. There have been a lot of poorly manucatured mineral cables, the manufacturing process is very technical, even the good ones can breakdown.
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Ok a bit more information. This pyro was cut rather than having a bad seal.
I think that the damage may have been caused by freeze thaw cycles once the magnesium oxide had become saturated, which would be consistent with the splits.
I think that the damage may have been caused by freeze thaw cycles once the magnesium oxide had become saturated, which would be consistent with the splits.
Did you replace it with more Pyro.
RF years ago i sent you a message, but it got lost i think when the forum changed, i have a 100m unused original wrapping coil (Old school aprox 1metre round) its either 2L1.5 or 2.5, orange pvc served, i can check size.
If you ever back working in london I could drop it off ,for you i will give you a good deal .
if interested message me, no rush i have had it over 10 years, never had the heart to weigh it in, should test ok, ends should be factory sealed and you know how to meggar it anyway
RF years ago i sent you a message, but it got lost i think when the forum changed, i have a 100m unused original wrapping coil (Old school aprox 1metre round) its either 2L1.5 or 2.5, orange pvc served, i can check size.
If you ever back working in london I could drop it off ,for you i will give you a good deal .
if interested message me, no rush i have had it over 10 years, never had the heart to weigh it in, should test ok, ends should be factory sealed and you know how to meggar it anyway
Perhaps the one in the photo picked up some damage to its sheath?
Anyone remember the screw type pots being replaced by the wedge type in the 70s. I was never happy about using them and they eventually went back to the screw type.
Anyone remember the screw type pots being replaced by the wedge type in the 70s. I was never happy about using them and they eventually went back to the screw type.
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