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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 

= 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

Содержание SQE-NE Series

Страница 1: ...on 12 6 1 General 12 6 2 Assembly of pump part and motor 12 6 3 Removal of non return valve 12 6 4 Fitting the cable plug to the motor 13 6 5 Fitting the cable guard 13 6 6 Cable sizing 14 6 7 Fitting...

Страница 2: ...ator As a minimum the generator output must be equal to the motor P1 kW 10 Starting current The motor starting current is equal to the highest value stated on the motor nameplate Power factor PF 1 Mot...

Страница 3: ...ng a screwdriver or a similar tool 4 Inject motor liquid into the motor with a filling syringe or the like 5 To allow possible air to escape move the motor from side to side 6 Refit the filling plug a...

Страница 4: ...arked with the following symbol Supply voltage 1 x 200 240 V 10 6 50 60 Hz PE The current consumption can only be measured by means of a true RMS instrument If other instruments are used the value mea...

Страница 5: ...be used on the clamping faces of the pump part See fig 6 Fig 6 When pump part and motor have been assembled correctly there must not be a clearance between pump part and motor 6 3 Removal of non retur...

Страница 6: ...earance between the motor and the cable plug 6 5 Fitting the cable guard To fit the cable guard proceed as follows 1 Make sure that the submersible drop cable lies flat in the cable guard 2 Place the...

Страница 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 contac...

Страница 8: ...lation depths Maximum installation depth below the static water level 150 metres See fig 11 Minimum installation depths below the dynamic water level Vertical installation During start up and operatio...

Страница 9: ...switch and diaphragm tank during starting will be lower than the pump cut in pressure set on the pressure switch pcut in This lower pressure is called minimum pressure pmin pmin is equal to the desir...

Страница 10: ...ce tools are available from Grundfos The Grundfos Service Manual is available on request The pumps can be serviced at a Grundfos service centre 9 1 Contaminated pumps If Grundfos is requested to servi...

Страница 11: ...n the electric installation are blown Replace the blown fuses If the new ones blow too the electric installation and the submersible drop cable should be checked b The ELCB or the voltage operated ELC...

Страница 12: ...e is defective Replace the riser pipe i Undervoltage has occurred Check the power supply 4 Frequent starts and stops a The differential of the pressure switch between the start and stop pressures is t...

Страница 13: ...d neutral Connect the voltmeter to the terminals at the connection The voltage should when the motor is loaded be within the range specified in section 5 Electrical connection Large variations in supp...

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