When is conduit required for residential wiring?

In New Brunswick residential wiring, conduit is required in specific locations where cables need protection from physical damage, moisture, or environmental hazards. The Canadian Electrical Code as adopted by TSANB has clear requirements for when conduit must be used versus when standard NMD90 (Romex-style) cable is acceptable.

Conduit is mandatory in several residential situations. Any wiring in unfinished basements below 1.5 meters (5 feet) from the floor must be in conduit or armored cable to protect against physical damage. This is especially important in New Brunswick homes where basement workshops and storage areas are common. Outdoor wiring always requires conduit - whether you're running power to a detached garage, pool equipment, or exterior outlets. The maritime climate in areas like Saint John and Moncton makes proper conduit installation critical for preventing moisture infiltration and corrosion.

Garage wiring has specific conduit requirements under the CEC. Any outlets or circuits within 1.5 meters of the garage floor must be protected, typically with EMT (electrical metallic tubing) conduit. This protects against damage from vehicles, tools, and storage items. Similarly, any wiring in mechanical rooms, furnace areas, or locations where it might be subject to physical damage requires conduit protection.

Wet and damp locations throughout the home require conduit. This includes bathroom circuits that might be exposed (though most bathroom wiring is concealed in walls), laundry rooms where moisture is present, and any area where cables might be exposed to condensation. New Brunswick's high humidity levels make proper moisture protection especially important.

When conduit isn't required, standard NMD90 cable can be used for most residential wiring. This includes all concealed wiring in walls and ceilings, finished basement areas where cables are protected behind drywall, and most interior circuits. The key is that the cable must be protected from physical damage and moisture.

TSANB inspectors pay close attention to proper conduit installation and sizing. Conduit must be properly sized for the number and gauge of conductors, with appropriate fill ratios maintained. All connections must use proper fittings, and grounding/bonding requirements must be met. For outdoor installations in New Brunswick's freeze-thaw climate, expansion fittings may be required for longer runs.

The specific conduit requirements can vary based on your exact situation and local amendments to the code. Always verify requirements with your licensed electrician, as they'll ensure your installation meets current TSANB standards and passes inspection.

Need help finding an electrician familiar with New Brunswick conduit requirements? New Brunswick Electrical can match you with local professionals who understand the specific code requirements and climate considerations for our province.