Main Power Supply Wiring And Switch Capacity - Mitsubishi Electric CAHV-R450YA-HPB Service Manual

[ II Restrictions ]

[3] Main Power Supply Wiring and Switch Capacity

Schematic Drawing of Wiring (Example)
A: Switch (with current breaking
capability)
B: Earth leakage breaker
C: Outdoor unit
Main power supply wire size, switch capacities, and system impedance
Minimum wire thickness (mm
Model
M a n i
CAHV-R450YA-HPB 14
1. Use a dedicated power supply for each unit. Ensure that each unit is wired individually.
2. When installing wiring, consider ambient conditions (e.g., temperature, sunlight, rain).
3. The wire size is the minimum value for metal conduit wiring. If voltage drop is a problem, use a wire that is
one size thicker.
Make sure the power-supply voltage does not drop more than 10%.
4. Specific wiring requirements should adhere to the wiring regulations of the region.
5. Power supply cords of appliances for outdoor use shall not be lighter than polychloroprene sheathed
flexible cord (design 60245 IEC57).
6. Do not install a phase advancing capacitor on the motor. Doing so may damage the capacitor and result in fire.
7. Use the breakers that match the unit capacity (leakage current limit, current breaking threshold, etc.).
8. Select the type of breaker for an inverter circuit as an earth leakage breaker. (Mitsubishi Electric NV-S
series or its equivalent)
9. A breaker with at least 3.0mm contact separation in each poles shall be provided.
10.When using an earth leakage breaker without an overcurrent breaker, use a local switch and a molded-
case circuit breaker in combination.
11.If the power cable is damaged, it must be replaced by qualified personnel in order to avoid a hazard.
12.The appliance shall be installed in accordance with national wiring regulations. However, the local
standards and/or regulations is applicable at a higher priority.
13. When the power cable is connected, the grounding wire must be longer than the power wire.
Warning:
• All electric work must be performed by a qualified electrician according to the local regulations,
standards, and the instructions detailed in the Installation Manual.
• Be sure to use specified wires and ensure no external force is imparted to terminal connections. Loose
connections may cause overheating and fire.
• Proper grounding must be provided by a qualified personnel. Do not connect the grounding wire to gas
pipe, water pipe, lightning rod, or telephone wire.
- Improper grounding may result in electric shock, smoke, fire, or malfunction due to electrical noise interference.
• Include some slack in the power cables.
- Failure to do so may break or overheat the cables, resulting in smoke or fire.
• Install an earth leakage breaker on the power supply of each unit.
- Failure to do so may result in electric shock or fire.
• Only use properly rated breakers (an earth leakage breaker, local switch <a switch + fuse that meets local
electrical codes>, or overcurrent breaker).
- Failure to do so may result in electric shock, malfunction, smoke, or fire.
• Only use standard power cables of sufficient capacity.
- Failure to do so may result in current leakage, overheating, smoke, or fire.
• Tighten all terminal screws to the specified torque.
- Loose screws and contact failure may result in smoke or fire.
HWE22020
3N~380–415V
L , L , L , N
1 2 3
2
)
c a b e l B a r n c h G o r u n d
- 14 50 A 100 mA 0.1 sec. or less
B A
C
PE
Local switch (A)
Earth leakage breaker
C a p a
50
- 23 -
Overcurrent breaker
(A)
c y t i F u s e
50 50
Max. Permissive
System Impedance
0.16
GB