SC2000 PTA1587X, User Instruction

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Chapter 4
Appendix
4.3 Lightning and Surge protection
45
°
Steel pipe sheath
Speed dome camera must be
installed in the range of 45°
under the lightning rod
Video surge arrester
Communication surge arrester
Power Supply Surge Arrester
lightning rod
Ground impedance
is less than 4
Ω
A
p
p
e
n
d
ix
Outdoor speed dome camera must consider thunder-proof and surge immunity.
On the premise of guaranteeing electrical safety, we can take following lightning
protection measures:
Ÿ At least keep 50m distance between signal transmission line and high voltage
equipment or high voltage cable;
Ÿ Outdoor wiring under the eaves;
Ÿ For open field, adopt seal steel pipe buried wiring way, and adopt one-point
earthing with the steel pipe. Do not adopt aerial wiring.
Ÿ It need to add extra high-frequency thunder-proof device and lightning rod in
strong thunderstorms area or high inductive voltage region(such as high voltage
substation);
Ÿ Thunder-proof and grounding design of Exterior installation and circuit must be
in accordance with building lightningproof requirements; It must meet national
standard and industry standard;
Ÿ
System must be equipotential grounding. Grounding device must meet anti-
jamming and electric safety dual requirements. The connection with strong
electrified wire netting can’t be short connection or mixed connection. When
system is in the condition of single-phase grounding, ground impedance is less
2
than 4
Ω,
ground wire cross-section area must be more than 25 mm .