![]() Let’s say you have an 8- gauge and a 10-rated lying a round at home. That is assuming the right conditions, such as temperature. If you’re more cautious, a 4 AWG is great. Here are all the products we recommend based on NEC’s ampacity chart to ensure safety. We’ve got you covered if you want to buy a circuit breaker or a sub-panel. For 600 amp, you will need a 1500 kcmil- gauge wire size. For a 400 amp service, you will need a 600 kcmil-gauge copper wire size. For a 200 amp service, you will need a 250 kcmil-gauge copper wire size. For 150 amp, you will need a 1/0- size copper wire size. For an 80 amp, you need a 4- gauge copper wire size. For a 100 amp service, you will need a 1- gauge wire size.įor 125 amps, you will need a 1- gauge copper wire size. What electrical components do I need for a project? The rule of thumb that techs will usually go by is that for a 70 amp circuit breaker, 4-gauge copper wire is the right size to go with. If this is your first time reading about the topic, we cover some basic things to know about it. This prevents the conductor’s operating temperature from adversely affecting the overcurrent device.Knowing which size to pick is important, so you can use the right one for your equipment that requires electricity. Rule 4-006 requires conductors to be sized using temperature columns in tables 1-4 which correspond with the termination temperature rating marked on equipment. Insulated conductors available in Canada are primarily supplied with a 90C insulation rating. Table 2 requires a #3/0 AWG Cu service conductor to be used to supply this installation. A load calculation determines the load as being 180 A. Minimum ampacity of service conductors shall be the greater of 8-200 1) a) or 1) b). When selecting the service conductors from the 75 degree column of Table 4, a #1 AWG service conductor is to be used to supply this installation.Įxample 2– Single family dwelling with 105m2 total floor area supplied with copper conductors and equipment marked as 75 degrees. In this example, the total floor area (>80m2) and based on area will require the minimum 100-amp service. A load calculation determines the load as being 95A. When determining the size of service and feeder conductors for single dwellings and feeder conductors supplying single dwelling units of row housing, apartments, and similar buildings, several rules throughout the code provide guidance in selecting the appropriate size - specifically rules 4-004, 4-006, 8-104 1, 8-106, 8-200 1, and 8-202 1Įxample 1– Single family dwelling with 105m2 total floor area supplied with aluminum service conductors, and equipment marked as 75 degrees. Rule 4-004 Ampacity of wires and cables (see Appendix B) ![]() Installers should consult with local authorities having jurisdiction before starting work to determine their requirements. The requirements of local municipal authorities having jurisdiction may vary. This bulletin provides guidance on the application of rules in the 2018 BC Electrical Code Regulation.
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