If space is tight and your looking for the maximum of cable room you can use schedule 20 PVC pipe as the OD is the same as the regular schedule 40 but there is a slight increase in the inside diameter. Note that if your making bends or sweeps you will be advised to seal off the ends to keep the heated air inside and keep the very thin pipe from collapsing it can be bent but is much more likely to collapse without the extra care.
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