52. In the case of surveying involving an electrical energy source, the authorization holder must ensure that1° the charging and discharging circuits of the electrical seismic energy source are equipped with circuit breakers;
2° the electrical cables of the electrical seismic energy source are protected from damage and are adequately insulated and grounded to prevent current leakage and electrical shock; and
3° the electrical seismic energy source, when tested, is fully immersed in water.