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DS surge protectors are installed as follows, according to their types :
- Type 1 or «Heavy duty» : at the origin of the installation, in a separate
box or on the main electrical panel, for efficient discharge of high lightning
currents.
- Type 2 or «Primary» : at the origin of the installation, on the main electrical
panel, so as to shunt lightning currents as directly as possible and
thereby avoid coupling.
- Type 2 (or Type 3) or «Secondary» : on the secondary panel, near the
sensitive equipment, to limit ringing and improve the level of protection.
Wiring
Since lightning surges are essentially common-mode phenomena, DS
surge protectors are connected mainly in the common mode (between the
active conductors and ground).
Some recommendations call for additional differential-mode protection
(between phase and neutral). For this case, CITEL proposes special surge
protectors (types DUT40, DS210D...) or, when the standards allow, combinations
of surge protectors between phases and neutral (differential mode)
with a special surge protector (DS100EG, DS40G) between neutral and
ground (common mode) : this type of mounting, named «CT2 connection»
in IEC 60364 standard, is used in surge protectors such as DS44-230/G.
Protection modes
Installation
DS surge protectors are connected in parallel on the AC network and must
be equipped with external fuses (or breakers) for short-circuit protection
(see paragraph «Disconnection devices»).
- The total length of connection wires to AC network must be lower than
0.5 m in order not to increase the protection level (Up) provided by the
SPD.
- Wiring is made by screw connections. On some models, a distribution
bus can be used.
- The protection wire coming from the SPD must be connected to the bonding
bar of the electrical panel. Paralleling the protection wire with phases
conductors must be avoided.
- The cross sectional wire must be 4 mm² minimum for Type 2 SPD’s and
10 mm² for Type 1.
- Local earthing resistance must be in compliance with the electrical rules.
Further information can be found in IEC 61643-12 standard (selection and
application principles for low voltage SPD).
Installation example (Type 2 surge protector DS44S)
Common mode protection
switchboard)
DS150
DS250
DUT250VG
DUM125
Installation without LPS Type 2 main switchboard DS70R, DS40
DS240,DUT40

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