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430D series of hazardous location bells are diode-polarized, heavy duty fire bells for use in life safety applications where a diode supervised signal is required. Hazardous location bells are available with 6-inch (152 mm), 8-inch (203 mm) or 10 inch (254mm) gongs, for either 120 Vac or 24 Vdc operation. They can be mounted to any solid surface using two 3/8 inch (10 mm) bolts and the supplied mounting brackets or to a rigid conduit. The integral explosion-proof housing is mechanically terminated to accept a standard ¾-inch -14 National Pipe Taper (NPT) nipple.