When, for good and sufficient cause, it is necessary to have the electricity on in any installation before final certificate can be issued, the Electrical Inspector may, if the parts to which the current is applied are in a safe and satisfactory condition, issue a temporary certificate.  When a temporary service is installed satisfactory to the Electrical Inspector, the City Electrical Department will not be permitted to make a connection to permanent service until after a final permanent certificate has been issued.
(`83 Code, § 5-316)