A policy of prudent avoidance means avoiding exposure to EMFs because the risks are unknown. For example, the source of EMFs in a VDT is the flyback transformer located in the back of the monitor. The radiation is strongest in the back and side of the monitor. Computer operators should be at least four feet away from the back or sides of other workers machines. The danger can strike in the form of lightning, contact with power lines or current from equipment that uses electricity.
Electricity travels in circuits.
An electric shock occurs when a person becomes part of the electric circuit that the electricity is moving through. A health and safety program should include work practices to prevent shocks and electrocution. The GFCI cuts the circuit before the electricity reaches the worker.