What safety and regulatory factors need consideration when servicing a dry-type transformer?

Due largely to its air cooled design, the actual mechanics of servicing a dry-type transformer are relatively easy and can be conducted by anyone with the necessary training and experience. However, like all transformers, these units need to be de-energised by a qualified professional before anyone is allowed to gain access to them. There are specific regulations that relate to medium voltage electrical equipment which need to be observed. There are important isolation and lock-out procedures, for example, such as ensuring that the circuit breaker is earthed.