Electrical Inspection Maintenance Service Annual Electrical System Audit.Electric transformer inspection Maintenance of MDB, DB, check ground wire.Check the electrical system in building, general electrical. This absolutely necessary in order not to cause a power failure while the power supply in progress. If there is a sudden power outage or This absolutely necessary interruption while production process will do a lot of damage. Therefore, the electrical system should to be inspected for ensure that always available full efficiency. Electrical System Inspection Laws in Thailand require employers to conduct annual electrical inspections. According to the announcement of the Department of Industrial Works and the Department of Labor Protection Welfare Details of the various audits can be found below.