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L
Outdoor power supply
N
SPD
V in
Example of Incorrect wiring
L
Outdoor power supply
N
SPD
V in
L
N
Example of Incorrect wiring
L
Outdoor power supply
N
SPD
V in
Example of Incorrect wiring
L
Outdoor power supply
N
SPD
V in
Example of Incorrect wiring
Insulation
Application field
class
TN
TNC
✓
✓
Class I
The Xtreme Surge Protector I is released for these distribution systems
V out
V out
V out
V out
TNS
TNCS
TT
IT
✓
✓
✓
✓
Incorrect wiring
If the Xtreme SPD is not wired correctly then it will
not be able to protect up to the specified protection
levels and damage to the luminaire may result.
Examples of incorrect wiring include:
• Installing unprotected wires (wires which are not
routed through the Xtreme Surge Protector) in
parallel with the protected output wires of the
driver
• Crossing of mains and output wires, mains and
output wires bundled together.
• Crossing of unprotected and protected wires
• Not connecting the input and output wires as a
star point to the SPD
• Unnecessary long wiring between the SPD and
the driver.
• Unnecessary long ground wiring between the
SPD and protective earth or luminaire chassis.
Fusing and mains power distribution system
Standard outdoor applications require fusing to
protect the installation. Fusing above 20 A is not
allowed when applying the Xtreme SPD. Lower fusing
values are allowed but may require shorter fusing
servicing intervals since lower fusing values can
handle less surge events before tripping.
The SPD has an extremely low power consumption
and does not impact the inrush current so luminaire
fusing is not affected by the Xtreme SPD.
In a TN mains power distribution system the neutral
conductor (N) is connected to the earthed star point
of a distribution transformer and is either connected
to the star point via a separate conductor (TN-S) or it
is (partly) combined with the protective earth
conductor (TN-C, TN- C-S). The Protective Earth (PE)
wire is also connected to the same star point and
part of the distribution wiring to the end user.
In a TT mains power distribution system, the PE
conductor is not part of the distribution wiring to the
end user. Protective earth is locally sourced at the
end user by means of an earth pin.
In an IT mains power distribution system, the star
point of the distribution transformer is isolated from
earth. The N and PE conductors are not wired to the
end user. The end user has to source a local earth
conductor if needed.
11
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