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Adequate means must be provided to limit the movement of this appliance without depending on or transmitting stress to the electrical conduit. The following requirements apply: 1. Maximum height of casters is 6" (152mm). 2. Two of the casters must of be the locking type. 3. Such mobile appliances or appliances on mobile stands must be installed with the use of a flexible connector secured to the building structure. A mounting connector for a restraining device is located on the lower back flange