CPC Main Group H02H 1/00 Details of emergency protective circuit arrangements 6 direct subcodes Child Classifications Navigate with arrow keys, Enter to open H02H 1/0007 H02H 1/0038 H02H 1/0061 H02H 1/0092 H02H 1/04 Arrangements for preventing response to transient abnormal conditions, e.g. to lightning H02H 1/06 Arrangements for supplying operative power