WIRING
■
LEADWIRES
Conductor cross-section area: 8 to 35 mm
2
(stripped length
15 mm) for both the power and the ground lines. 14 mm
2
minimum is recommended.
■
TORQUE
Tighten the screw terminals securely. Recommended torque
is of 4.5 N·m.
■
MARKING LABEL
Use the marking labels included in the product package to
identify power lines. The labels are appropriate in size to be
placed close to each terminal as designated in the external
dimensions.
Nine labels are printed with typical markings.
L1
L2
L3
N
E
G
PE
PEN
■
WIRING BRIDGE
Wiring bridges for two units (model: CNB2-4), for three
units (model: CNB2-5) and for four units (model: CNB2-7)
are available for easy cross-wiring to the ground.
■
WIRE LENGTH
Keep the wire length to the minimum for both the power
source side and the ground side. Connect the surge protec-
tor and the protected device to the same equipotential bond-
ing bar as following. The wire length between the branch
point and the ground should ideally be less than 0.5 meters.
Equipotential bonding bar
a
b
a+b ≤ 0.5 m
SPD
Power
GROUNDING
■
COMMON GROUNDING WITH CROSS-OVER WIRE
Basically a common grounding with cross-wiring between
the MAL and the protected device is recommended for ad-
equate protection. Ground both the surge protector and the
protected device to the same equipotentially bonding bar as
following. If the protected device has no ground terminal,
ground only the MAL.
Protected
Device
G
N
ACC
SPD1 SPD1 SPD2
Equipotential bonding bar
SPD1: MAL
SPD2: MALN
ACC: CNB2
●
Single-phase/3-wire connection (TT system)
Circuit
Breaker
■
INSTALLING THE DEVICES SEPARATELY
When installing the surge protector in a low-voltage inlet,
grounding is likely to be independent if the protected device
is not installed nearby. In this case, potential difference
between the surge protector and the protected device less-
ens lightning protection function when thunder storming.
When the wiring distance from the surge protector is 10
m or more, maximum surge voltage becomes high potential
due to reflection. When the wiring distance exceeds 10 m,
install the other class II surge protection near the protected
device as following.
Protected
Device
G
N
ACC1
SPD1 SPD1 SPD2
Equipotential bonding bar
SPD1: MAL
SPD2: MALN
ACC1: CNB2
SPD3: MAKF
SPD4: MAKN
ACC2: CNB
●
Single-phase/-wire connection (TT system)
ACC2
Service entrance switch gear
SPD3
SPD3
SPD4
≥ 10 m
Circuit
Breaker
Circuit
Breaker
MAL
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: [email protected]
EM-8162 Rev.1 P. 7 / 8
