Section 193(1) in The New Delhi Municipal Council Act, 1994
(1)No person other than a licensed plumber shall execute any work described in this Chapter and no person shall permit any such work to be executed except by a licensed plumber:Provided that if, in the opinion of the Chairperson, the work is of a trivial nature, he may grant permission in writing for the execution of such work by a person other than a licensed plumber.
