This chapter shall not be construed to relieve from or lessen the responsibility or liability of any party owning, operating, controlling or installing any electric wiring, devices, appliances, or equipment for damages to persons or property caused by any defect therein nor shall the City be held as assuming any such liability by reason of the inspection or the examination authorized herein or the certificate therefor issued as provided here, or by reason of the approval of any materials, devices, appliances or equipment authorized here.