English (GB)
14
6.6 Cable sizing
Grundfos can supply submersible drop cables for
any type of installation.
The table values below are calculated from the
following formula:
where
q
= Cross-section of submersible drop cable
[mm
2
].
I
= Rated maximum current of the motor [A].
PF = 1.0.
L
= Length of submersible drop cable [m].
ρ
= Specific resistance: 0.02 [
Ω
mm
2
/m].
U
= Nominal voltage [V].
Δ
U = 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:
6.7 Fitting the submersible drop cable
It is recommended to join the submersible drop cable
and the motor cable by means of a Grundfos cable
termination kit, type KM.
For larger cross-sections, please contact Grundfos.
Caution
The cross-section of the submersible
drop cable must be large enough to
meet the voltage requirements
specified in section 5.1 General.
q =
I x 2 x 100 x PF x L x
ρ
U x
Δ
U
Max. cable length [m]
Motor
(P2)
I
N
Cable size
1.5 mm
2
2.1 mm
2
/
14 AWG
2.5 mm
2
3.3 mm
2
/
12 AWG
4 mm
2
6 mm
2
[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
Cable termination kit, type KM
Cross-sectional area
Product number
1.5 to 2.5 mm
2
96021462
4.0 to 6.0 mm
2
96021473
