24
A
Type 2
surge arrester (SPD2) should be used in coordination with the incoming
Type 1
surge
arrester. This is the second stage of protection. The 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 (this is effectively the “left-over” surge from the Type 1 protection device). To provide
sufficient de-coupling between the Type 1 and Type 2 devices, impedance is required. This is
typically stated to be 10m of cable (approximately 10µH). This cable may be looped if the distance
available is too short. Alternatively various manufacturers have devices which act as filter elements
or provide active spark ignition for applications where 10m of cable is not practical (such as outdoor
enclosures).
Note:
Newmar Rectifiers are compliant with EN61000-4-5, 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.
WARNING:
If these systems are used in outdoor cabinet applications, the fitment of a
Type 2 AC Surge Suppression Device is mandatory.
If a Type 2 SPD is NOT fitted, the warranty is void.
If further advice is required and/or for supply of an appropriate Type 2 SPD, contact your
nearest Newmar representative.
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:
Incoming
Significant coupling
between unprotected and
protected AC line negates
the effectiveness of SPD
Incoming
Minimal coupling
between Protected and
Unprotected AC lines
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