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مکانیک::
BIL duty
4.5.3 Where the design basic insulation level (BIL) is not available
and where nominal voltage Ls used for the design criteria,
the highest minimum clearance for this group shall be used.
4.5.4 The selected clearance to ground shall satisfy the greater
of the switching surge or BIL duty, rather than being based on
nominal voltage.
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