3 For the purposes of subsections 262(6) and 298(6) of the Act, the circumstances in which periods may be excluded from the calculation of the time limit under subsection 262(4) or 298(4) of the Act are any of the following:
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(b) the undertaking of studies or the collection of information relating to a change made by the applicant in the design, the construction or the operation of an international or interprovincial power line referred to in subsection 262(1) of the Act or a proposed work or activity referred to in subsection 298(1) of the Act and the resulting effects of the change, if the Commission is of the opinion that there is not sufficient information available to it for the purpose of issuing the certificate or the authorization, as the case may be; and