Attach a ground wire from one of the threaded studs (A) at the bottom of the housing, to the mounting plate (B). The ground resistance between all system parts shall be <. Today, we're diving deep into the world of distribution box grounding, breaking down the standards, and shining a light on those sneaky mistakes that even experienced electricians sometimes make. Each DISTRIBUTION BOX and controller must be grounded. 26 mm 2 (10 AWG) ground wire must be used, and in all other markets a 6 mm 2 must be used. Grounding is necessary to assure correct operation of electrical devices, to assure safety. During the manufacturing process, metal enclosures typically have fixed points welded to the base plate or side walls. This design aims to provide a stable physical anchor point for the yellow-green grounding wire. The specific neutral grounding method chosen by the utility can have significant impacts on reliability of service, safety, protection coordination, power.
[PDF Version]