"Temporary electrical work" means that work which is obviously installed for the convenience of a person during construction. This work shall be the complete responsibility of the person who installs it and shall not require the inspector’s approval prior to being used, provided that the inspector may require corrections in the wiring to eliminate any hazardous or unsafe conditions. All such work shall be removed before final approval of permanent electrical work. Temporary electrical work shall not be permitted to remain in use in excess of six months except by written permission of the electrical inspector.