3 Leave of the Board to construct a facility across, on, along or under a power line or to excavate using power-operated equipment within 30 m of a power line, pursuant to subsection 58.31(1) or subsection 112(1) of the Act, is not necessary where
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(a) these activities are designed and executed in accordance with CAN/CSA-C22.3 No. 1-M87, Overhead Systems, as amended from time to time, in respect of overhead crossings;
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(b) these activities are designed and executed in accordance with CAN3-C22.3 No. 7-M86, Underground Systems, as amended from time to time, in respect of underground crossings;
