Has seen that my 20, 30 amp hot water switches are 2 pole unlike the lamp switches that are only 1 pole (hot wire). Who can tell me the requirements that require a 2 pole switch? What are the benefits or safety features of the 2 pole switch? thnx. And please don't worry anyone-i would not touch one with a ten foot rubber screwdriver as i am not 'vocationally trained and certified competent'.