Four identical 100 MVA, 22 kV generators are operating in parallel, as shown above in two busbar sections, interconnected through a current limiting reactor of x p.u. reactance on the generatorbase. Each generator has a reactance of 0.2 p.u. The value of the reactor x to limit a symmetrical short-circuit (a-b-c) current p.u. through the circuit breaker to 1500 MVA is _________ p.u.