All electrical equipment and systems shall be installed in accordance with the California Building Standards Electrical Code, 1971, the National Electric Code, 1971, and API RP 500 B, 1973, incorporated here by reference. On mobile drilling structures, certificated by the U. S. Coast Guard, this equipment shall be installed, protected, and maintained in accordance with the applicable provisions of CG-259, Electrical Engineering Regulations, 1971, incorporated here by reference.