Rigid ducting

[ey143]

Why is some rigid ducting textured or shaped as shown in the following link and also colored?

http://www.drainfast.co.uk/gifs/product_images/small/twinwall_duct_rigid_225mm_x_266mm-6m.jpg

 

[SimonH2]

I suspect it's to improve rigidity (resistance to crushing) by having the ribs, but without the weight of having it all that thick. Something with the same amount of material but uniform wall thickness would be less rigid (resistance to crushing) and would also be stiffer in bending.

 

[kazuya]

black for electrics, blue for water and yellow for gas

 

[SimonH2]

Err, blue for fresh water, grey or brown for, errm, not fresh water. And I though electrics used red ?
Purple for telecoms/data, though I think BT still use grey.

Actually I don't think there is a hard and fast set of rules for ducting colours, and it probably varies by region.

 

[ey143]

I'm thinking in the context of ducting for the home.

 

[stuart45]

It's ribbed so it bends easily, the colours are so you know what should be in there. Black is lower voltage red carries higher. The colour coding is the same in other areas, or there wouldn't be much point having it. Contractors often work in other places.

 

[ey143]

So if it's ribbed, does that mean it's not rigid ducting?

 

[stuart45]

You can get it coils, or the shorter more rigid lengths which still have some flexibility, although you can still get bends for them.

 

[kazuya]

Err, blue for fresh water, grey or brown for, errm, not fresh water. And I though electrics used red ?
Purple for telecoms/data, though I think BT still use grey.

Actually I don't think there is a hard and fast set of rules for ducting colours, and it probably varies by region.

yes there are hard and fast rules for underground ducting
they are
black electricity
orange street lighting
purple motorway communications
grey telecommunications
yellow gas
blue water
green cable TV