Electricity Today T&D Magazine

Cranes, aerials and bucket trucks are common sights in construction zones and among maintenance crews around our cities. What better way to hoist materials to high places or to move workers closer to the task?
When your crew includes an above-ground operator in a bucket or cab, they’re linked to ground activity via a dedicated spotter. A spotter’s job is to free up the operator to focus on what they’re doing, uninterrupted from jobsite distractions. Here are five ways to improve communication between these two.

1. KEEP COMMANDS SIMPLE

The fewer commands being used, the better. Whether it’s OSHA’s standard...

Step Potential

Step potential is the step voltage between the feet of a person standing near an energized grounded object. It is equal to the difference in voltage, given by the voltage distribution curve, between two points at different distances from the electrode. A person could be at risk of injury during a fault simply by standing near the grounding point.

Touch Potential

Touch potential is the touch voltage between the energized object and the feet of a person in contact with the object. It is equal to the difference in voltage between the object and a point some distance...