The MINIMUM dimensions of the telecommunications main grounding busbar is ________ and variable in length.
4 mm (0.16 in) x 80 mm (3.15 in)
6.3 mm (0.25 in) x 100 mm (4 in)
8 mm (0.31 in) x 110 mm (4.33 in)
10.5 mm (0.41 in) x 140 mm (5.51 in)
12.75 mm (0.50 in) x 175 mm (6.89 in)
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