The intelligence in Class 1, 2, and 3 rated power systems are rudimentary power limiting systems. OESC Wiring Methods Specifications (Ontario Electrical Safety Code)Ĭircuits that do not fall under wiring methods, would typically be given a class rating, and any class rated power systems in a building do not require a breaker panel because they have built-in intelligence to prevent faults or safety risks to the user. Here's a screenshot from the codebook for your reference that defines what falls under wiring methods: Additionally, systems that fall under regulations relating to Wiring Methods also require a breaker panel or fuse box. As you can imagine, this definition covers many circuits. The CEC states that the provisions in this section of the code book "apply to all wiring installations operating at 750 Volts or less, as well as to installations operating at voltages in excess of 750 Volts, except as modified by the requirements of Section 36". This, in itself, is a little concerning seeing as electricity (especially AC power) can be dangerous, especially since us adults are unsupervised almost all the time, and very few of us understand how the electrical systems in our homes and buildings work.Įlectrical systems in our buildings typically fall under a section in the Canadian Electrical Code (CEC) called “Wiring Methods'' (Section 12 of the CEC and OESC). Most of the electrical loads in your building are inherently dangerous to wire because they have no intelligent way to actively prevent the risk of electrical shock or fire. A Brief Summary of Class Ratings in the Electrical Code
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