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A door sill or curb that is of an approved height that will confine the oil from the largest transformer within the vault shall be provided, and in no case shall the height be less than 100 mm (4 in.).
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(B) Equipment for General Use, Sills
A door sill or curb that is of an approved height that will confine the oil from the largest transformer within the vault shall be provided ...
(B) Equipment for General Use, Sills
A door sill or curb that is of an approved height that will confine the oil from the largest transformer within the vault shall be provided ...
2.11.11.1 Electric Elevators, Landing Sills
Landing sills shall (a) be metal and of sufficient strength to support the loads to be carried by the sills when loading and unloading the car ...