spigot The cable style you have quoted is more commonly used for submersible pumps, I know because I use it.
The reason you say it's more commonly used for submersible pumps, is because you work with.... submersible pumps.
The reason I said it's more commonly used in commercial/industrial switchboards is because commercial industrial switchboards are found in every single building complex around the world. Supermarkets, service stations, shopping centres, factories etc.
How much of this cable would there be per metre compared to.... submersible pumps.
Next time your at a woolworths supermarket, ask them to open up a light and power distrubution board and you'll see what I mean.