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GENERAL WIRING INFORMATION
7.1
Earthing Of the Equipment
Equipment surge protection products are an effective way of controlling dangerous surges
that can enter a facility.
When strategically placed and correctly installed, the Surge Protectors will effectively
reduce harmful over voltage conditions that can damage electrical and electronic equipment.
It is important that the protection system includes both structural and surge protection
equipment.
When lightning current passes into the ground through any conductor (Example: Tree Trunk)
a powerful electromagnetic force is set up due to the fast rise times of the strike. This
electromagnetic force then couples into any inductive loops that may be available in nearby
buildings. When these currents equalize, damage usually occurs to the equipment.
Table 7-1
Lightning Protection Zones
LPZOA
This zone is an area where a direct hit to the structure is possible. The current may rise
to a value of 200000A (10/350us) producing extremely high electromagnetic fields. Any
conductor system must be capable of carrying the full lightning current.
LPZOB
This zone is an area where a direct hit is not possible, but high electromagnetic fields
will be present. This zone is determined by the effectiveness of the structural protection
system.
LPZ1
Again, a direct hit in this area is not possible due to the screening measures applied.
The electromagnetic field is much lower than LPZOA and LPZOB. It is in this zone
where appropriate surge arresters may be fitted that will limit the value of surge current
entering a facility.
LPZ2
The value of surge current and electromagnetic field will be lower than that of LPZ1
when correct protection principles have been applied. It is in this area where sensitive
electromagnetic equipment may be safely installed.
Figure 7-1
When Mains is connected to the inverter the Neutral connection is bonded to Earth via
the Mains utility supply, earth bar.
If the Inverter is connected as a stand-alone inverter with no Mains Connection, the Neutral is
required to be earthed using an earth spike.
If the Inverter is not earthed; warranty will be null and void.
Connect to Grid Live In
Connect to Grid Neutral In
Connect to AC Load Live Out
Connect to AC Load Neutral Out
Connect to Main DB Earth Bar
