11
Fig. 8
3. Fasten the cable guard to the pump suction
strainer with the two self-tapping screws supplied,
see fig. 9.
Fig. 9
5.6 Cable sizing
Grundfos can supply submersible drop cables for
any type of installation.
Note: The cross-section of the submersible drop
cable must be large enough to meet the voltage
requirements specified in section 4.1 General.
The table values below are calculated from the
following formula:
where
q = Cross-section of submersible drop cable
[mm²].
I = Rated maximum current of the motor [A].
PF = 1.0.
L = Length of submersible drop cable [m].
ρ = Specific resistance: 0.02 [Ωmm²/m].
U = Nominal voltage [V].
ΔU = Voltage drop [%] = 4 %.
The 4 % voltage drop is according to IEC 3-64,
HD-384 Series.
The calculation gives the following maximum cable
lengths at a supply voltage of 240 V:
TM02 9613 3504TM01 4427 0299
q
I2100PFLρ× ××××
U Δ U×
---------------------------------------------------------------=
Max. cable length [m]
Motor
(P2)
I
N
Cable size
1.5 mm²
2.1 mm²/
14 AWG
2.5 mm²
3.3 mm²/
12 AWG
4 mm² 6 mm²
[kW] [A]
0.7 5.2 80 112 133 176 213 320
1.15 8.4 50 69 83 109 132 198
1.68 11.2 37 52 62 82 99 149
1.85 12 35 49 58 76 92 139
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