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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.
Note:
Newmar Rectifiers are compliant with EN6100-4-5, Level 4 without any
external/upstream surge suppression. To maintain a coordinated approach to surge
suppression, Type 2 SPD should be installed upstream if not fitted in the system.
To ensure correct operation of the SPDs, at least 10m of AC feeder cable is fitted between the Type
1 and Type 2 protection. If the distance is less than 10m, then loop the cable until at least 10m of
cable is used. This ensures correct de-coupling of the SPD devices.
Notes on AC cable installation and SPDs
The following precautions must be adhered to when installing AC cabling.
1. Avoid running input and output cables from AC Surge Protection Devices together:
2. Avoid "Tee'd" Connections:
Newmar • 1580 Sunflower Ave, Suite 100, Costa Mesa, CA 92626
Phone: 714-751-0488 • E-mail: techservice@Newmarpower.com
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