Grundfos SQE 1-140 96510147 [12/388] Cable sizing

English (GB)

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

I = Rated maximum current of the motor [A].

PF = 1.0.

L = Length of submersible drop cable [m].

ρ = Specific resistance: 0.02 [Ωmm

/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:

Caution

The cross-section of the submersible drop

cable must be large enough to meet the

voltage requirements specified in section

5.1 General.

I x 2 x 100 x PF x L x ρ

U x ΔU

Max. cable length [m]

Motor

(P2)

Cable size

1.5 mm

2.1 mm

14 AWG

2.5 mm

3.3 mm

12 AWG

4 mm

6 mm

[kW] [A]

0.7 5.2 80 112 133 176 213 320

1.15 8.4 50 69 83 109 132 198

1.55 11.0 37 52 62 82 99 149

1.85 12 35 49 58 76 92 139