Interesting question, to which I do not have an answer. Here is the best I can find:
OH-58A fitted with the WSPS was subjected to pendulum swing tests in which the helicopter struck fixed cables at approximately 40 knots airspeed. The system demonstrated the capability to easily sever 10,000-pound-strength 3/8- inch steel messenger cable, 50-pair copper communications cable, and 0.419-inch high-power transmission lines, including multiple arrays of those cables.
OH-58A fitted with the WSPS was subjected to pendulum swing tests in which the helicopter struck fixed cables at approximately 40 knots airspeed. The system demonstrated the capability to easily sever 10,000-pound-strength 3/8- inch steel messenger cable, 50-pair copper communications cable, and 0.419-inch high-power transmission lines, including multiple arrays of those cables.