In Canada, electrical boxes are required to be grounded according to the Canadian Electrical Code (CEC). Proper grounding is a fundamental safety requirement to ensure the safe operation of electrical systems and to protect against electrical shock, fires, and other hazards.
The CEC, which is published by the Canadian Standards Association (CSA), provides guidelines and regulations for electrical installations in Canada. It includes specific requirements for grounding and bonding of electrical systems, including electrical boxes. Here are some key points regarding grounding electrical boxes in accordance with the Canadian Electrical Code:
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Grounding Conductors: Electrical boxes should be connected to the grounding system through grounding conductors. These conductors are typically copper or aluminum wires that are sized according to the electrical load and circuit requirements.
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Grounding Electrodes: The grounding conductors should be connected to grounding electrodes, which may include ground rods, metal water pipes, or other approved grounding methods. The purpose of grounding electrodes is to establish a low-resistance path to the earth for fault currents.
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Bonding: In addition to grounding, the CEC also specifies bonding requirements to ensure that all metal parts of the electrical system, including electrical boxes, are effectively connected together to prevent potential differences and electrical hazards.
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Metal Boxes: Metal electrical boxes are commonly used in Canada, and they are typically self-grounding. This means that when a metal conduit or metal cable is attached to the box, it provides the necessary grounding connection. However, it's essential to ensure that all connections are secure and properly made.
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Non-Metallic Boxes: Non-metallic electrical boxes (e.g., plastic) may require grounding methods specific to their construction, such as the use of a grounding conductor or a separate grounding clip or plate.
To ensure compliance with the Canadian Electrical Code and to ensure the safety of electrical installations, it's important to have electrical work performed by qualified electricians who are familiar with local electrical codes and regulations. They will ensure that electrical boxes and systems are grounded correctly and meet all safety standards.