for that period, in uninterrupted service, including service which may be interrupted on account of sickness or authorized leave or an accident or a strike which is not illegal, or a lock out or a cessation of work which is not due to any fault on the part of the workman; (2) where a workman is not in continuous service within the meaning of clause (1) for a period of one year 452 he shall be deemed to be in continuous service under an employer (a) for a period of one year, if the workman, during a period of twelve calendar months preceding the date with reference to which calculation is to be made, has actually worked under the employer for not less than (i) one hundred and ninety days in the case of a workman employed below ground in a mine; and (ii) two hundred and forty days, in any other case; The Explanation to section 25B is the same, mutatis mutandis as before.