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Metric designators and trade sizes for conduit, tubing, and associated fittings and accessories shall be as designated in Table 300.1(C).
Table 300.1(C) Metric Designators and Trade Sizes
Metric Designator Trade Size
12 3/8
16 1/2
21 3/4
27 1
35 11/4
41 11/2
53 2
63 21/2
78 3
91 31/2
103 4
129 5
155 6
Note: The metric designators and trade sizes are for identification purposes only and are not actual dimensions.

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