No payment of any sum out of the New Delhi Municipal Fund shall be made unless the expenditure of the same is covered by a current budget-grant and a sufficient balance of such budget-grant is still available notwithstanding any reduction or transfer thereof which may have been made under the provisions of this Act:
     Provided that this section shall not apply to payments made in the following classes of cases, namely:--
         (a) refund of taxes and other moneys which are authorised under this Act;
         (b) repayment of moneys belonging to contractors or other persons and held in deposit and of moneys collected or credited to the New Delhi Municipal Fund by mistake;
         (c) sums payable in any of the following circumstances--
             (i) under orders of the Central Government on failure of the Council to take any action as required by that Government; or
             (ii) under any other enactment for the time being in force; or
             (iii) under the decree or order of a civil or criminal court passed against the Council; or
             (iv) under a compromise of any claim, suit or other legal proceedings; or
             (v) on account of cost incurred in taking immediate action by the Chairperson under clause (c) of section 18 to avert a sudden threat of danger to the property of the Council or to human life;
         (d) temporary payments for works urgently required by the Central Government in the public interest;
         (e) sums payable as compensation under this Act or under any rules, regulations or bye-laws made thereunder;
         (f) expenses incurred under section 287 by the Chairperson on special measures taken on the outbreak of dangerous diseases.