Final answer:
In Canada, a #8 gauge wire supports up to 40-amps, a #6 gauge wire up to 55-amps, a #4 gauge is for up to 70-amps, and a #3 gauge accommodates up to 85-amps.
Step-by-step explanation:
In Canada, the electrical services use different gauges of wire depending on the ampere rating required. The American Wire Gauge (AWG) system standardizes the size of wires, indicating that a higher gauge number corresponds to a thinner wire.
Electrical installations utilize specific wire gauges to safely conduct the current needed by the connected devices. For a #8 gauge wire it is commonly used for electrical services up to 40-amps. A #6 gauge wire is suitable for systems up to 55-amps. For more demanding installations a #4 gauge wire can handle services up to 70-amps and a #3 gauge wire is rated for up to 85-amps.