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Transparent cables in fire escapes?

Am I the only one who was puzzled by references in recent posts to 422.2.1, requiring cables to have "at least 60 % light transmittance" when used in protected escape routes. I have seen transparent flexes on appliances before, but never for fixed wiring.

Was this some special rule to stop cables blocking the light from emergency lighting?

Thanks to the latest Wiring Matters, and looking up what BS EN 61034-2 is, I'm now suitably enlightened.

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0 mapj1 over 3 years ago

For those still wondering, it is not the cables that need to have 60% light transmission, but the smoke density when a sample is held over a fire pit (of low smoke slow burn fuel, a mix of alcohols and water)

https://www.ri.se/en/what-we-do/services/en-61034-2-smoke-density-of-electric-cables-burning

In other words, a low smoke cable, which in a escape route makes good sense.

The regs could have been clearer about that.

Mike
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0 mapj1 over 3 years ago

For those still wondering, it is not the cables that need to have 60% light transmission, but the smoke density when a sample is held over a fire pit (of low smoke slow burn fuel, a mix of alcohols and water)

https://www.ri.se/en/what-we-do/services/en-61034-2-smoke-density-of-electric-cables-burning

In other words, a low smoke cable, which in a escape route makes good sense.

The regs could have been clearer about that.

Mike
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Vote Up +1 Vote Down

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Transparent cables in fire escapes?

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