Does the 20 cm minimum diameter rule in Clause 7, sub-clause (3) apply to pipes in sub-clause (2) too?

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Full Text of the Document

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....Whether restriction regarding the requirement of minimum 20 cm. diameter contemplated under sub-clause (3) of Clause 7 in the table of the Notification No. 6/2006-C.E., dated 1-3-2006 as amended by the Notification Nos. 25/2006-C.E. dated 20-3-2006, applies to the pipes specified under sub-clause (2) of Clause 7 of the said table of the said notification also....