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Frequently Asked Questions
How does a shorter clearing time help?
Energy released tracks duration.
Half the time is half the energy.
Milliseconds instead of hundreds changes everything.
The fault still occurs.
What reaches the room does not.
Why is light not enough on its own?
Because other things are bright.
A camera flash reaches a sensor.
So does a torch through a vent.
Current confirms a real event.
Both together are dependable.
What does a crowbar device do?
It creates a deliberate short.
Current takes the metal path instead.
The open arc is starved and stops.
Upstream protection then clears normally.
Damage is confined to hardware.
Does this replace protective clothing?
No, it changes what is required.
Clothing is rated to an energy figure.
That figure comes from the equipment.
Faster clearing lowers it.
The rating still has to be respected.
Can it be fitted to existing equipment?
Often, with sensors and a relay.
Fibre or point sensors go in the cubicles.
A trip path to the upstream device is needed.
Commissioning has to prove it.
An untested installation proves nothing.
What does it do to selectivity?
It deliberately bypasses the delays.
Grading normally slows upstream devices.
An internal arc cannot wait for that.
The scheme trips immediately instead.
Discrimination is traded for speed.
Where is this most worth fitting?
Where people work near live equipment.
Large incoming sections.
Boards with high prospective fault current.
Sites with frequent switching duties.
And anywhere the calculated energy is high.