875—73.6 (89A) Machines.
	 73.6(1) Friction gearing or clutch mechanisms shall not be used for connecting the drum or sheaves to the main driving mechanism.
	 73.6(2) Set screw fastenings shall not be used on power elevators in lieu of keys or pins on connections subject to torque or tension.
	 73.6(3) Portable power-chain or cable hoist machines shall not be used to raise or lower an elevator car.
	 73.6(4) No belt or chain driven power machine shall be used for any elevator unless the machine is provided with a broken belt or broken chain safety switch of the electrical nonautomatic reset type. Exception: Hydraulic machines.