Hello all.
One related NEBS interpretation is based on the occurrence of the
building housing the equipment being hit by lightning. If the frame of
the building is carrying this large current spike, on the longer cables
that are run through the building (likely over 10m) enough energy could
be coupled onto the cables to create a hazard. By extension, shorter
cables would probably be confined to within one equipment room and would
not be long enough or near enough the current carrying building members
to have dangerous amounts of energy coupled onto them. Hope this helps.
Dave
Usual views of employer disclaimer , etc. . .
Zohar Zosmanovich wrote:
Hi,
The EN 300 386 (EMC requirements for telecommunication network equipment)
require to perform a surge of 1.2/50 Tr/Th us, 0,5 kV to ports for indoor
signal lines (in telecommunication centers), when cables longer than 10 m
are connected !
Can some one explain my the rational of divided up to 10 m and more than 10
m, anyway all cable is in the building (indoors) ?
Zohar (Jana) Zosmanovich
Compliance Engineer, RADWIN ltd.
34 Habarzel St., Tel Aviv 69710, Israel
Tel.: 972-3-7666735 ; Fax: 972-3-7657535
Email: <mailto:zohar_zosmanov...@radwin.com>
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--
David Heald
Senior EMC Engineer/
Product Safety Engineer
Curtis-Straus LLC NRTL
Laboratory for NEBS, EMC, Safety, and Telecom
Voice:978.486.8880x254 Fax:978.486.8828
www.curtis-straus.com
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