Specifications
34
RF SOLUTION-CITEL
Surge protection installation
●
Location
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 mm
2
minimum for Type
2 SPD’s and 10 mm
2
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)