When materials and works may be supplied and done under this Chapter for any person by the Commissioner

On the written request of any person who is required under any of the provisions of this Chapter to supply any materials, fittings, cistern or lock and key or to do any work, the Commissioner may, on such person’s behalf, supply the necessary materials, fittings, cistern or lock and key, as the case may be, or cause the necessary work to be done; but he shall not do so in any case to which the provisions of section 493 or 495 will not apply, unless a deposit is first of all made by the said

person of a sum which will, in the opinion of the Commissioner, suffice to cover the cost of the said

material, fitting, cistern, lock and key or work.]