Final answer:
Isolating a transformer usually involves turning off the power supply, following lockout/tagout procedures, and confirming de-energization with appropriate testing instruments. The sequence and specifications vary depending on the manufacturer and workplace safety guidelines.
Step-by-step explanation:
The sequence to isolate a transformer for safety is not directly provided in the reference material. However, based on general electrical safety practices, isolating a transformer typically involves a series of steps that ensure no current can flow through unintended paths. First, the power supply to the transformer should be turned off. Next, lockout and tagout procedures must be followed to ensure that the transformer cannot be inadvertently re-energized during maintenance or inspection. This typically includes physically locking the disconnect switch in the off position and attaching a tag that indicates the device is being serviced. After ensuring the transformer is de-energized, grounding the transformer terminals can provide additional safety to discharge any stored energy. Confirming that the transformer is isolated using appropriate electrical testing instruments before starting any work is essential. It's important to follow the specific guidelines and procedures provided by the manufacturer or those outlined by workplace safety standards.