Section 63K(1)(c) in The West Bengal Factories Rules, 1958
(c)For factories employing above 250 workers :-(i)there shall be one full time Factory Medical Officer for factories employing upto 1000 workers and one more Factory Medical Officer for every additional 500 workers or part thereof;(ii)there shall be an Occupational Health Centre having at least two rooms each with a minimum floor area of 15 sq.metres with floors and walls upto a height of 1.5 metres made of smooth and impervious surface;(iii)the center shall be provided with adequate ventilation and illumination as well as equipment as per the schedule annexed to this rule;(iv)there shall be one qualified nurse, one qualified and trained dresser-cum-compounder and one sweeper-cum-ward boy in each shift; and(v)the center shall be suitably equipped to manage medical emergencies.