Final answer:
The question attempts to ask about sizing a disconnect box for a three-phase motor but provides insufficient and seemingly unrelated details, such as the use of % when describing a RMC pipe nipple size. The correct approach for determining the box size would typically involve NEC guidelines, specifically Articles 314 and 430.
Step-by-step explanation:
To determine the minimum size for a box housing a three phase motor disconnect with the specifications mentioned, we must consider the National Electrical Code (NEC) guidelines. The sizing will depend on the number and size of the conductors entering and leaving the box, as well as various allowances for clamps, fittings, and the device itself.
However, given that the question provides limited information and seems to include a mix of unrelated data, it is unclear exactly how to calculate the minimum size requirement without additional context. Normally, an electrician would refer to NEC Article 314 for box sizing and Article 430 for specifics regarding motor disconnects. It is also important to consider that grounding wires and their size, such as #10 THW wire, need to be factored into box fill calculations along with other conductors.
The question's mention of a % RMC 6 nipple and a wall anchor seems out of place, as a percentage is not a standard way to describe a conduit nipple size, and the method of attaching the box to the wall is not typically part of sizing calculations.