H3C S5170-EI Series Installation Manual page 10

Item
Lightning protection
Cable routing
ESD prevention
Cleanliness
Corrosive gas prevention
EMI
Requirements
•
Lasting high relative humidity can cause poor insulation, electricity
leakage, mechanical property change of materials, and metal
corrosion.
•
Lasting low relative humidity can cause washer contraction and
ESD and cause issues including loose mounting screws and circuit
failure.
•
High temperature can accelerate the aging of insulation materials
and significantly lower the reliability and lifespan of the switch.
For the temperature and humidity requirements of the switch, see
technical specifications in H3C S5170-EI & S5570S-EI Switch Series
Hardware Information and Specifications.
CAUTION:
Ground the switch correctly and verify the grounding. For more
information, see "Grounding the
•
If you ground the switch by using a grounding strip, make sure the
grounding resistance of the grounding strip in the equipment room is
less than 1Ω.
•
If you ground the switch by using a grounding conductor buried in
the earth ground, make sure the grounding resistance of the
grounding conductor in the ground is less than 10Ω.
•
Route the signal cables along indoor walls, bury the cables in the
earth ground, or thread the cables through steel tubes. Install a
signal lightning arrester with a nominal discharge current for a
corresponding network interface.
•
Keep the signal cables far from power cords and lightning rod down
conductors.
•
As a best practice, route power cords indoors. If an AC power cord
is routed from outdoors, connect the AC power cord first to a power
lightning arrester before leading it to the AC power port on the
switch. Make sure the power lightning arrester has a nominal
discharge current and the total length of the power cord from the
power lighting arrester to the power port on the switch is less than 5
m (16.40 ft).
•
Ground the switch, rack, independent power supplies, and lightning
arresters separately.
•
You must ground optical fibers with reinforcing metal stiffener from
outdoors on an optical distribution frame (ODF) or fiber splice
enclosure.
CAUTION:
Do not run an Ethernet cable and power cord in parallel.
•
Route different types of cables separately.
•
Keep power cords a minimum of 5 cm (1.97 in) away from other
cables.
•
Ground the switch correctly.
•
To avoid ESD damage to the device or FRUs, always wear an ESD
wrist strap when you install or remove the device or FRUs.
•
Make sure the wrist strap has good skin contact and is reliably
grounded.
For more information, see "Cleanliness."
The installation site must be free from corrosive gases such as acid
gases and alkaline gases. For more information, see
limit."
•
If AC power is used, use a single-phase three-wire power receptacle
3
switch."
"Corrosive gas