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7.3 Earth Leakage Relay and Grounding
:
Electrical Shock
Ground the every earth grounding terminal to the earth as set out in the manual. If even one
of all is unconnected by mistake or accident, it will be much more dangerous for human
body than the –relay case, because leaking current inevitably goes through the body.
Even though all the bonnets of the loads have been grounded to the earth, the earth
grounding terminal and the outer bonnet (canopy) grounding terminal should be grounded
to the earth.
Grounding should be made after the engine is stopped.
Whenever the earth leakage breaker relay is activated, you should always repair the
leaking place first of all.
The generator is provided with the earth leakage breaker relay to detect any leakage
Produced due to such the trouble as insulation failure of the load while the generator is
running and to cut off the circuit for protection against any accident such as electrical
shock resulting from the trouble.
The specification of the earth leakage relay;
Rated Sensitive Current: 30mA (or below) (Grounding resistance: 500Ω or below)
Sensitive time: Within 0.1second
<Caution>
Different sensitivity relay is available to change. But, in the case, consult with our
Engineering Section, because the value each of grounding resistance and grounding
condenser will be different accordingly.
In the event bigger value sensitive relay (100, 200, 500mA, etc.) than 30mA will be used in
the device, they are too high in value to prevent from electrical shock. Therefore, install each
load with the 30mA (or below) relay separately.
The detailed information about sensitive current selection is prepared to give by the Article
No.151.2 In Earth Leakage Breaker – Selection of The Wiring Regulations issued by Japan
Electric Association.
7.3.1 Grounding Work
The qualified electrician should perform the grounding of the following 3 points (500Ω or
below).
● The earth grounding terminal in the output terminal block
● The Outer Bonnet (Canopy) grounding terminal of the generator
● The Outer Bonnet of the load
Danger