How to install a sub-panel?

Installing a sub-panel (secondary distribution panel) is governed by several articles of the Quebec Construction Code:

Installation rules:

• A sub-panel must be fed by a dedicated breaker in the main panel
• The feeder conductor must be sized for the sub-panel load, with a minimum of #8 AWG copper for a 40 A sub-panel
• Maximum distance: no specific limit, but voltage drop must be less than 3%
• Neutral and ground must be separated in the sub-panel (isolated neutral bar, ground bar bonded to the enclosure)

Common uses:

• Detached garage (60 A, buried TECK90 cable)
• Finished basement with several new circuits
• Workshop with heavy machinery
• Home extension (addition)

Installation must be done by a CMEQ-certified electrician and an RBQ inspection may be required depending on the municipality.