STANDATA Variance: 2018 Canadian Electrical Code – Rule 12-102 Insulated Conductors

September 16, 2021

Underground service entrance (USE) cables, USEB and USEI, are listed for use in Table 19 as service entrance cables only. What about using them for feeders and branch circuits?

Discussion

1. USEB and USEI cables as listed for use in Table 19 for service conductors do not contain a bonding conductor as part of the cable as required by Rule 10-610. As such, USEB and USEI cables are not acceptable for use as feeders beyond the load side of the service equipment where the grounded conductor is bonded to ground.

2. The 2021 CE Code, Part 1 has a new, updated Table 19, which permits USEB and USEI cables to be used as feeders and branch circuits provided that they are installed in accordance with Rule 10-616.

Variance

1. 2018 CE Code Rule 12-102

As an alternative solution regarding USEB and USEI cables, Table 19 of the 2021 CE Code, Part 1 may be used which permits USEB and USEI cables to also be used as feeders and branch circuits provided that they are installed in accordance with 2021 CE Code Rule 10-616. This variance provides approximately equivalent or greater safety performance with respect to persons and property as that provided for by the Safety Codes Act. This Variance is applicable throughout the province of Alberta and remains in force until the adoption of the 2021 CE Code, Part 1.

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