Classified by the different throughput capacity and installation place,
usually the UPS system has no more than 2 levels of lightning
protection. The first level lightning protection adopts C-class SPD (
or
-class) with a max throughput capacity of 40kA, waveform 8/20 s,
installed between the UPS and the AC distributor; the second level
lightning protection adopts D-class SPD
(or -class
) with a max
throughput capacity of 8kA, waveform 8/20
s, installed inside the
UPS. Standard D-class SPD is installed inside the iTrust UPS, and
the SPD24SZ C-class SPD produced by Avansys is recommended.
User may decide whether to select C-class SPD according to the
actual situation of the machine room. Whichever brand C-class SPD
is selected, the connection method shown in the following figure
must be adopted between the C-class SPD and the UPS, i.e., the
protective ground (the UPS metal case) and the C-class lightning
protection ground of the UPS share the same ground, and are then
connected to the ground bar in the machine room.
52 Appendix 2 Grounding & Lightning Protection
E1-20010916-C-1.0
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