279. In addition to high voltage circuit grounding with ground-connecting switching devices, for additional operator safety and confidence, portable grounding straps may be used. What is the proper procedure for connecting these portable grounding straps?

Portable grounding straps should connect the common connection to hull ground first, followed by the phase connections to ensure a low-resistance ground path and minimize shock and arc-flash risk; connecting in any other sequence can create a dangerous energized potential.