[R. O. 1947, ch. 11, § 10]
When any work which requires a certificate of approval is completed or ready for inspection, the Inspector of Wires shall be so notified and a time shall be set for inspection. Conductors, raceways, cables or fittings shall not be lathed in or concealed from view until approved by the Inspector of Wires; provided, however, that observance of this provision shall not be required so far as inspection thereof is rendered impracticable in the erection, construction or assembling of prefabricated housing of a type approved by the board of examiners and appeals under Chapter 3, The Building Code, as appears by the records on file in the office of the Inspector of Buildings.