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810.55 Entrance to Building
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Except where protected with a continuous metallic shield that is grounded with a conductor in accordance with 810.58, lead-in conductors for transmitting stations shall enter buildings by one of the following methods:
- Through a rigid, noncombustible, nonabsorbent insulating tube or bushing
- Through an opening provided for the purpose in which the entrance conductors are firmly secured so as to provide a clearance of at least 50 mm (2 in.)
- Through a drilled window pane
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