Daikin EWWT100Q - Cable Requirements; Phase Unbalance; Connection of the Power Supply of the Unit; Table 4 - Table 1 of EN60204-1 Point 5.2

D-EIMHP01702-23_00EN- 37/72
product need to be connected to a low voltage public distribution system, specific additional measures will have to be taken to avoid
interference with other sensitive equipment.
Before any electrical connection work to the compressor motor and / or the fans, make sure that the
system is switched off and the main switch of the unit is open. Failure to observe this rule could
result in serious personal injury.
Cable requirements
The cables connected to the circuit breaker must respect the insulation distance in the air and the surface isolation distance between
the active conductors and the earth, according to IEC 61439-1 table 1 and 2, and to the local national laws. The cables connected
to the main switch must be tightened using a pair of keys and respecting the unified clamping values, relative to the quality of the
screws of the washers and nuts used.
Connect the earth conductor (yellow / green) to the PE ground terminal.
The equipotential protection conductor (earth conductor) must have a section according to table 1 of EN 60204-1 Point 5.2, shown
below.
Table 4 – Table 1 of EN60204-1 Point 5.2
Section of the copper phase conductors feeding the
equipment
S [mm
2
]
Minimum cross-section of the external copper protection
conductor
Sp [mm
2
]
S ≤ 16
16 < S ≤ 35
S > 35
S
16
S/2
In any case, the equipotential protection conductor (earth conductor) must have a cross section of at least 10 mm
2
, in accordance
with point 8.2.8 of the same standard.
Phase unbalance
In a three-phase system, the excessive imbalance between the phases is the cause of the engine overheating. The maximum
permitted voltage unbalance is 3%, calculated as follows:
𝑆𝑏𝑖𝑙𝑎𝑛𝑐𝑖𝑎𝑚𝑒𝑛𝑡𝑜 % =
(
𝑉𝑥 − 𝑉𝑚
)
∗ 100
𝑉𝑚
where:
Vx = phase with greater unbalance
Vm = average of the tensions
Example: the three phases measure 383, 386 and 392 V respectively. The average is:
383 + 386 + 392
3
= 387 𝑉
The unbalance percentage is:
(
392 − 387
)
∗ 100
387
= 𝟏. 𝟐𝟗 %
less than the maximum allowed (3%).
Connection of the power supply of the unit
Using the suitable wire, connect the power circuit to the terminals L1, L2 and L3 of the electric panel.
Never twist, pull or apply weight to the terminals of the main switch. The wires of the power supply line must
be supported by adequate systems.
The wires connected to the switch must respect the elevated insulation distance and the distance of surface insulation between the
active conductors and the mass, in accordance with IEC 61439-1, Table 1 and 2 and local national laws.The wires connected to the
main switch must be tightening using a wrench torque and complying with the unified tightening values relative to the quality of the
screws of the washers and the nuts used.