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Frequently Asked Questions
What is actually being switched on a temporary site?
Two temporary sources, usually.
A hired generator and a site supply.
Or two generators of different sizes.
Rarely a permanent mains connection.
That changes very little about the risk.
Manual or automatic in this setting?
Manual suits most temporary work.
Somebody is on site anyway.
An interruption costs little.
Automatic belongs where the load cannot wait.
Medical, broadcast and data are the exceptions.
How is backfeeding prevented?
By making the positions physically exclusive.
No software and no procedure.
The handle cannot occupy both.
It should be visibly obvious.
Temporary sites need that most.
Where does the earth come from?
From whichever source is connected.
A trailer generator brings its own arrangement.
The site supply brings another.
Neutral switching decides which applies.
Get it wrong and protection may not operate.
What ratings are typical?
Whatever the hired set delivers.
Small units for a single trade.
Large ones for a whole site compound.
Starting loads set the real figure.
Not the sum of the nameplates.
Can the same unit move between jobs?
That is generally the point.
Connections are plug and socket.
The enclosure expects transport.
Inspection between hires matters.
Damage happens in the van, not on site.
What goes wrong with these most often?
Connection errors, not device faults.
Wrong plug fitted in a hurry.
Earthing assumptions carried from another job.
Marking that has worn off.
Mechanically, they are simple things.