Electrical Pull Box / Junction Box Size Calculator Canada
CEC Rule 12-3036 — minimum box dimensions for straight and angle/U pulls.
Conduits enter and leave on opposite walls in line.
Minimum box length (straight pull)
16.00"
(406 mm)
Formula
8 × largest conduit trade size
Per CEC Rule 12-3036. Box depth must also be adequate for conductor bending space (see CEC Table 31). Always verify against CEC Part I.