Permit Scope and Owner-Builder Responsibilities
A homeowner is building a detached garage with a workshop. They have pulled an owner-builder permit for the electrical work, which includes a 60A subpanel, receptacles, lighting, and a 240V welder outlet. The homeowner has some electrical experience but is not a licensed electrician. You are the FSR hired by the homeowner to inspect the work before the final inspection by Technical Safety BC. During your inspection, you find: the subpanel is mounted on wood, the neutral and ground bars are bonded, the welder outlet is a 3-wire type with no separate ground, and the conduit from the house to the garage is PVC buried only 12 inches deep. The homeowner says the permit covers everything and they followed a YouTube video. The AHJ has not yet inspected. The homeowner is eager to get final approval.
1. Identify the deficiencies and explain why they are non-compliant. What must the homeowner do to correct them?
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Deficiencies: 1) Subpanel mounted on wood is acceptable if it is a suitable enclosure, but the panel must be listed for the application and securely fastened; however, the bonding of neutral and ground bars in a subpanel is not permitted (CEC Rule 10-204) because it creates a parallel neutral path. The neutral must be isolated from ground in the subpanel. 2) The welder outlet is a 3-wire type with no separate ground; this is a violation of CEC Rule 6-300 and 26-700, as the welder requires a grounding conductor. It must be replaced with a 4-wire outlet and wiring. 3) PVC conduit buried only 12 inches deep is insufficient; CEC Table 53 requires 18 inches for PVC conduit under a driveway or 24 inches in other areas? Actually, for PVC conduit, minimum cover is 18 inches for 600V or less (CEC Table 53). So 12 inches is non-compliant. The homeowner must: isolate the neutral and ground in the subpanel, add a grounding conductor to the welder circuit and change the outlet to 4-wire, and increase the burial depth to at least 18 inches. They must also obtain an inspection from the AHJ.
2. What are the limitations of an owner-builder permit, and what is your responsibility as the FSR?
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An owner-builder permit allows the homeowner to perform electrical work on their own property, but they must still comply with the Electrical Safety Regulation and the Canadian Electrical Code. The permit is not a substitute for competence; the homeowner must ensure the work is done safely and correctly. As the FSR, you are responsible for inspecting the work and identifying deficiencies. You must not approve work that is non-compliant. You should provide a written report to the homeowner listing the deficiencies and required corrections. You must also ensure that the homeowner understands that the final inspection by Technical Safety BC is mandatory and that your inspection does not replace the AHJ's inspection. You should not sign off on any work you have not personally inspected. If the homeowner refuses to correct deficiencies, you must report to the AHJ.