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Frequently Asked Questions
What guarantees the two sources never meet?
A mechanical interlock.
The positions physically exclude each other.
No software is involved.
Nothing to configure or misconfigure.
That impossibility is the point.
Why does backfeeding matter so much?
It energises lines that should be dead.
People work on those lines.
A private generator can do it.
The interlock is what forbids it.
Supply rules require the guarantee.
When is manual the better choice?
When someone is there and delay is fine.
Workshops, farms and small premises.
Sites with staff on shift.
Loads that tolerate a wait.
Simplicity is a real advantage.
What does it cost in capability?
Everything happens at human speed.
Nothing moves until someone arrives.
Out of hours that may be an hour.
Unmanned sites are poorly served.
That limitation is not adjustable.
Is there anything to maintain?
Very little, which is its appeal.
Exercise the mechanism occasionally.
Check the interlock still blocks.
Inspect terminals for tightness.
No batteries and no firmware.
Can one be added to an existing installation?
Usually, at the incoming position.
The supply must be broken to insert it.
Space and cable length decide the ease.
Earthing arrangements need checking.
Retrofitting is common.
How is the load side arranged?
By deciding what is worth backing up.
An essential board takes those circuits.
The rest stays on the normal supply.
Generator size follows that list.
Backing up everything is rarely economic.