Complete Guide to PVC Conduit In this video we look at the different colour, sizes, types, fixing and boxes available for PVC conduit. This video will help learners at level 1, level 2 and in the early stages of an electrical apprenticeship. Plastic conduit for electrical wiring PVC conduit colours - black and white PVC conduit sizes - 16mm, 20mm 25mm and 32mm PVC conduit types - heavy gauge and light gauge PVC conduit saddles - plain saddle, crampet and spacer bar saddle PVC conduit Boxes - end