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9 A
3 – AC I
PPENDIX
IEC Class I
(EN Type 1)
(DIN Class B)
No other connections
earth bar and ground
SPD = Surge Protection Device
Fig 6.0 Illustrates the surge protection installation principles.
The Type 1 surge arrester, fitted in the installation's main incoming electrical switchboard, is
capable of deviating the energy of a direct lightning strike. This is the first stage of the electrical
network's protection. It is important that upstream Type 1 protection is provided on site.
10/350 wave as shown below is the current waveform which passes through equipment when
subjected to an overvoltage due to a direct lightning strike.
A Type 2 surge arrester should be used in coordination with the incoming surge arrester. This is
the second stage of protection. Type 2 Surge arrester is designed to run-off energy caused by
an overvoltage comparable to that of an indirect lightning strike or an operating overvoltage.
Some of the Newmar Power System models are provided with Type 2 Surge Protection Devices
(SPDs) (as defined by IEC 61643-11). These devices are rated for repeated strikes of 20kA
(8/20μs waveform as shown above), and single shot protection of 40kA.
• Phone: 714-751-0488 • E-mail: techservice@newmarpower.com
T
P
NPUT
RANSIENT
ROTECTION
Input and output cables
MUST BE SEPARATE
i.e., do NOT run parallel
Short Leads
N
L
SPD 1
Very Short Lead
Earth Bar
(preferably <150mm)
to earth between
Newmar • PO Box 1306, Newport Beach, CA 92663
Distance between
SPD1 & SPD2
Bunched
should be minimum
(Close
of 10 meters
coupled)
E
SPD 2
IEC Class II
(EN Type 2)
Alternative
(DIN Class C)
Earth Route
AC to DC
Earth Link
IEC Class III
(EN Type 3)
(DIN Class D)
(Built in to rectifiers)
21
Input and output
cables MUST BE
SEPARATE
i.e., do NOT run
parallel
POWER SYSTEM
L
3 meters
N
separation
SPD to
rectifier
Bunched
RECTIFIER
(Close
+
-
coupled)
To Loads
DC Common (+ve)
Busbar
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