When a short circuit occurs, the voltage across that point in the circuit essentially drops to near zero, as there is almost no resistance to impede the flow of current.
At the same time the current will flow until a fuse or circuit breaker disconnects the circuit.
What you need is for the portable earthing device to survive long enough for the fuse or circuit breaker to operate.
Electrical Personal Protective Equipment (PPE) and earth sticks are rated on voltage because it indicates the maximum electrical potential that the protective equipment can safely withstand without breaking down.
This ensures that the user is protected from electrical shock when working with a specific voltage level.
Essentially, the higher the voltage rating on the PPE or earth stick, the greater the protection it offers against higher voltage electrical hazards.
By almost no resistance: We measure the resistance from end to end of our devices in micro-ohms.
But the law says you need to keep safety clearance zones in mind during the earthing process.
So, any stick or handle used to apply a portable earth has to be longer than the minimum approach distance to the equipment, based on the usual voltage and the safety zones where it’ll be used.
