- Reaction score
- 520
any idea why a 12way 3 phase board is buzzing supply cable is 4core 35mm there are no spare ways in db there is a mixture of 32amp rcbo 3 phase breakers lighting circuts etc tightened up all terminations done a load test on l1 l2 and l3 fluxtiuating readings as db supplys photo studio one thing i have noticedc is the db is not balanced very well