Studer Innotec SA
next3
Technical user manual V1.3 © Studer-Innotec SA 37
5.3.2
AC Neutral and Earthing system
The next3 is a unit with protection class I, which is intended for cabling in a grid type TT, TN-S or TNC-
S. Its metal case must be earthed. The earthing of the neutral conductor is carried out at a sole
installation point, upstream of the RCD circuit breaker (in domestic application, generally type A, 30
mAac).
The neutral insulation to the earth is checked by the device and errors will be raised by the next3 if
the measurements doesn’t correspond to the settings of the device.
The next3 case and/or the PE connector, depending on the local installation rules, have to be
connected to earth. The PE cross section must be as big as the cross section of the line or neutral
conductor, but the minimum cross section must be at least 10mm
2
.
= protective earth (connected to the enclosure of the equipment).
In any case, the protective earth must be connected in accordance with local standards
and regulations in force. The protective earth of the equipment must be connected at least
to the protective earths of all the Class I equipment after and before the next3 (equipotential
connection). The information, notes, recommendations, and diagrams reported in this
manual are examples and must in any case be adapted to local installation rules. The installer
is responsible for the conformity of the installation with the local standards in force.
An additional earthing terminal is present under the AC-cables glands at the bottom of the
unit. It can be used instead of a connection on the input terminals of the device, particularly
when cable cross-sections used at the output do not allow the use of a five-wire cable (lines
L1 L2 L3, earth and neutral) through the conduit glands of the connection cables of the
input and output (AC-SOURCE, AC-LOADS and AC-FLEX), or when the earthing of one of
the poles of the battery. PE required using same or greater cross-sections than the battery
cable when the battery is grounded.
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