Cable Sizing; Caution - Grundfos SQ Serie Manual De Instrucciones

6.6 Cable sizing

Grundfos can supply submersible drop cables for
any type of installation.
The cross-section of the submersible drop
cable must be large enough to meet the

Caution

voltage requirements specified in section
5.1 General.
The table values below are calculated from the
following formula:
I x 2 x 100 x PF x L x ρ
q =
U x ΔU
where
q = Cross-section of submersible drop cable
2
[mm ].
I = Rated maximum current of the motor [A].
PF = 1.0.
L = Length of submersible drop cable [m].
ρ
= Specific resistance: 0.02 [Ωmm
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:
Motor
I
N
(P2)
[kW] [A]
0.7 5.2
1.15 8.4
1.55 11.0
1.85 12
12
2
/m].
Max. cable length [m]
2
2.1 mm /
2
1.5 mm
14 AWG
80 112
50 69
37 52
35 49
Cable size
2
3.3 mm /
2
2.5 mm
12 AWG
133 176
83 109
62 82
58 76
2 2
4 mm 6 mm
213 320
132 198
99 149
92 139