Upon completion of an electrical installation, which has been authorized by permit, the electrical contractor shall notify the Building Inspector, who shall inspect the installation promptly. If it is found to be fully in compliance with the provisions of this chapter, said Building Inspector shall issue a certificate of approval, or may endorse his approval upon the certificate of approval issued by a certified electrical inspector for the same work. Such certificates, when so issued, or when so endorsed, shall be delivered to the electrical contractor to whom permit for the work was issued, and shall constitute authorization for connection to the electric service and the use of the installation.
A certificate may be issued authorizing the connection and use of temporary work for a stated time, and a preliminary certificate may be issued authorizing the connection and use of certain specified portions of an uncompleted installation. Both such certificates shall be revocable at the discretion of the Building Inspector.
When any part of an installation is to be concealed by the permanent placement of parts of the buildings, the electrical contractor shall notify the Building Inspector, in writing, and such parts of the installation shall not be concealed until they have been inspected, or until 48 hours, exclusive of Sundays and legal holidays, have elapsed from the receipt of such notification by the Building Inspector, provided that on large installations where the concealment of parts of the installation proceeds continuously, the Building Inspector may, in his discretion, authorize the electrical contractor to give the uilding Inspector due notice and inspections shall be made periodically upon a schedule for such installation.