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Wiring work (Continued)
Types of allowable current
Conductors of supply cord shall have a nominal cross-sectional area not less than that shown in the table
below.
Minimum cross-sectional area of conductors
Grounding work
Grounding must be done by a qualified installer for your safety.
Grounding the power cable
• The standard of grounding may vary according to the rated voltage and installation place of a heating
pump.
• Ground the power cable according to the following.
High humidity
Average humidity
Low humidity
Electrical
potential of lower than 150V
Perform the
grounding work 3.
Note 1)
Perform the grounding work 2 if
possible for your safety.
Note 2)
Electrical
potential of higher than 150V
Must perform the grounding work 3.
Note 1)
(In case of installing circuit breaker)
Power condition
Installation place
Note 1) Grounding work 3
◆
Grounding must be done by your installation specialist.
◆
Check if the grounding resistance is lower than 100Ω.
When installing a circuit breaker that can cut the electric circuit in case of a short circuit, the allowable
grounding resistance can be 30~500Ω.
Note 2) Grounding at dry place
◆
The grounding resistance is should be lower than 100Ω.
(It should not be higher than 250Ω)
Rated current of appliance (A)
Nominal cross-sectional area (mm
2
)
≤0.2
Tinsel cord
a
≤0.2 and ≤3
0.5
a
>3 and ≤6
0.75
>6 and ≤10
1.0(0.75)
b
>10 and ≤16
1.5(1.0)
b
>16 and ≤25
2.5
>25 and ≤32
4
>32 and ≤40
6
>40 and ≤63
10
a: These cords may only be used if their length does not exceed 2m between the
point where the cord or cord guard enters the appliance and the entry to the plug.
b: Cords having the cross-sectional areas indicated in the parentheses may be used
for portable appliances if their length does not exceed 2m.
Exterior connection
DHW Power IN/OUT
Main power
NH080PHXEAHydro unit_IM_E 32659-1.indd 25
2010-07-28 ｿﾀﾈﾄ 8:59:34
