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A cable and conduit list tabulates instrumentation-wiring requirements, including power, other electrical, and any special manufacturer’s cables, and the quantity furnished with the instrument (e.g., magmeter’s primary cable, float-switch cable, etc.). Depending on the organization, this list may be part of the I&C or electrical designs. The purpose of this chapter is to advance the concept that P&IDs are the starting documents used by others to create complete automation design documents. Therefore, it is important to emphasize that practitioners should prepare these supporting documents as part of total automation design using P&IDs as one of the documents used to aid them in preparing these lists. Moreover, they should avoid jumping directly from P&IDs without other supporting documents (e.g., manufacturer equipment wiring diagrams for specified equipment, circuit wiring diagrams, etc.).