4. 5.1. Connecting earth cables
IMPORTANT : due to EMI lters*, there are "HIGH LEAKAGE CURRENTS".
As a consequence, it is imperative to connect earth cables before mains cables.
* EMI lters = protection against electromagnetic disturbances.
4. 5.2. Earth cable cross-section
We recommend a section of ground wire at least half of the section of cable phases AND comply with standards
of the country (for example NFC 15100 in France).
4. 5.3. Leakage current (rating of the earth leakage current device)
The minimum "off-delay relays" recommended is 3 A .
4. 5.4. Earthing systems and UPS (TT consult us)
In TNC: UPS output neutral must be grounded.
In TNS: when opening a 4 phases switch between UPS output and transformer upstream of the bypass, system
grounding must be present to reference the neutral to ground.
UPS Battery
The grounding of the auxiliary cabinets must be made directly to the reference earth.
Never use the UPS cabinet as earth terminal building.
a ≥ 35mm²
b = see § 4.5.2
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