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(b) Additional testing. Each manufactured home must be subjected to the following tests:

(1) An electrical continuity test to assure that metallic parts are effectively bonded;

(2) An operational test of all devices and utilization equipment, except water heaters, electric ranges, electric furnaces, dishwashers, clothes washers/dryers, and portable appliances, to demonstrate they are connected and in working order; and

(3) Electrical polarity checks to determine that connections have been made in accordance with applicable provisions of these standards and Article 550.17 of NFPA 70-2005 (incorporated by reference, see §3280.4). Visual verification is an acceptable electrical polarity check.

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