Related to Ballasted roof

Ballast means an electronic light source control gear between supply and light source to stabilise the electrical current of a gas-discharge light source;
Ballast water means water with its suspended matter taken on board a ship to control trim, list, draught, stability or stresses of the ship.
low voltage means the set of nominal voltage levels that are used for the distribution of electricity and whose upper limit is generally accepted to be an a.c. voltage of 1000V ( or a d.c. voltage of 1500 V). [SANS 1019]
Connected piping means all underground piping including valves, elbows, joints, flanges, and flexible connectors attached to a tank system through which regulated substances flow. For the purpose of determining how much piping is connected to any individual UST system, the piping that joins two UST systems should be allocated equally between them.
Cubic Meter or "m3" means the volume of Petroleum which occupies one (1) cubic meter and equals 264.1721 United States gallons and 6.2898108 barrels.

Ballasted roof definition