Alternating-current systems of 50V to 1,000V that supply premises wiring systems shall be grounded where supplied by a three-phase, 4-wire delta-connected system in which the midpoint of one phase winding is used as a circuit conductor. True or false?
It has to be grounded in order to stabilize the high alternating current voltage providing an alternative route for current to flow into the ground. and also protect it from lightening and thunder.