All the pumps I install are either on sch 40 galvanized or sch 120 PVC pipe. I do not use poly drop pipe ever. Most pumps I install need #10 wire or larger. Pulled a 20 hp set 300 ft on 2" galvanized this morning. Then moved the 10t pump truck to the next job. It will be a 460 volt 3 phase 10 hp, set 500 ft on 2" galvanized. These are both temporary test pumps for new community water systems. We run a 4 to 24 hr pump test and take water samples for bacteria, IOC's, VOC's and SOC's. We will be doing about a dozen new community systems for H2A farm worker housing this spring.
We can still install that 10 hp 460 volt motor on #10 wire. I use the 2" wide green 10 mil thick pipe wrap tape to attach the wire to the drop pipe, not 3/4" electrical tape. I usually tape the wire 5 ft below and 5 ft above each joint.
I've got a couple of 125 hp submersible test pumps. I'm using 4/0 wire with those. Tape isn't enough to support this wire. It gets strapped to the drop pipe every 10 ft with 3/4" stainless steel banding material.