Warning planks

[woodduder]

I have been in the electrical field for 25 years. I have never seen a "Warning plank" although I see the wording periodically in raceway and boxes job spec book. What does anyone who has installed a warning plank use as the warning plank? A 2x4, 1x4, ... Cannot locate anything on the web for such an item.

Thanks, Randy

 

[Ponchik]

what is the warning plank used for?
who has required it for you to put one in? And what are you installing it on?

 

[petersonra]

I think the word "plank" means "solid sign" (as opposed to an adhesive label). Not sure what hazard the sign is supposed to warn against.

 

[BJ Conner]

Warning Planks

Warning Planks

The "warning planks" I have seen were treated 2x12 s.
They were used for direct burried cables. The details would have 6-12" of sand, then the cable then 6-12" of more sand and a plank on top of that. About a foot above that would be red plastic tape.
Later jobs used "Concrete planks" with red dye in the concrete.

 

[dkidd]

From a canned spec:


Concrete Warning Planks: Nominal 12 by 24 by 3 inches in size, manufactured from 6000-psi concrete.
a. Color: Red dye added to concrete during batching.
b. Mark each plank with "ELECTRIC" or ?SIGNAL? in 2-inch- high, 3/8-inch- deep letters.

 

[wolfman56]

The reason is that if you are drilling into a slab and you notice the powder rising up from the bit is red stop immediately.

 

[pete m.]

The reason is that if you are drilling into a slab and you notice the powder rising up from the bit is red stop immediately.

Or sparks and smoke...:slaphead:

Pete

 

[satcom]

Back in the 50's and 60's you would always cover your cables with a "Warning plank" and build a sand bed above that, the planks, we used were 3/4 X 6 in 8ft lengths, and treated them with tar base, or roofing coating.

Then, along came PVC conduits