User guide for Cable Selector software tool
This program is meant as a simple tool for cable selection. It calculates corrections due to heat and due to
voltage drop in the cable.
Note that there are more factors than heat and current that determines the correct cable selection, matters
like chemical resistance, abrasion, fuses etc. Several cable types are available. Different standards apply
in various countries.
Various Flygt pumps and mixers can use different number of cables. This is not shown in the Cable
selector.
There are two different modes in the application, 'Find cable' and 'Calculate power limits'.
General
Enter data on the left. Note default values. Check red error messages shown if a selection is not logical.
On the right you see the input values and calculate the result. Blue boxes must be filled in before
calculation. Start method, high temperature and high voltage exclude non-relevant cable types
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Export: input values and result transferred to Excel
Clear returns everything to the default settings
Decimal "," and "." can be entered with local preferences. The result is shown in English with "." as
in 10.5 "ten point five"
Preferences Motor Data Cable Type Cable
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Choose "Units" and "Capacity correction area"
Choose function "Find cable" or "Calculate power limits"
Changing any setting under Preferences returns everything else to the default settings
Find cable - Find cable from given motor data
Preferences Motor Data Cable Type
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Choose if you want to enter the Rated current or Shaft power by choosing the 'current' or 'power'
radio button.
Check defaults and fill in empty boxes
Preferences Motor Data Cable Type
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Choose cable type
Choose number of parallel cables if you have a preference. "1" allows the program to suggest the
minimum number of cables possible
Find cable
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Recheck input values and click Find cable
You can change input values and click Find cable again
Result
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Max allowed current is the calculated power limit for the cable
The selected cable is the smallest one matching the rated current of the motor
Nominal current at 30oC is the current capacity of the cable according to IEC 60364-5-523
Rated current is your input value
Total weight is weight/m x cable length x number of cables
Calculate power limits - Calculate power limits from selected cable
Preferences Motor Data Cable Type Cable
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Check defaults and fill in empty boxes
Preferences Motor Data Cable Type Cable
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Choose cable type
Preferences Motor Data Cable Type Cable
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Choose number of parallel cables for your case
Select Cable or Flygt Part Number
Click Select to confirm
Find cable
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Recheck input values and click Calculate
You can change input values and click Calculate again
Result
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Rated current is the calculated maximum allowed motor current for this case
Shaft power is the calculated maximum allowed shaft power for this case
Nominal current at 30oC is the current capacity of the cable according to IEC 60364-5-523
Total weight is weight/m x cable length x number of cables
Note the number of cables required for the specified case
Temperature correction
Temperature correction factors for Flygt cables
The current capacities for Flygt cables are designed for duty at 30oC ambient temperature. If the ambient
temperature exceeds 30oC, the maximum current rating the conductors can handle has to be taken into
consideration. The current rating must be adjusted (lowered) according to the table.
Note that there are no reduction factors för the Flygt HCR cables and the Silicone cables up to 90 oC, due
to their insulation materials´ resistance to high temperatures.
Example
Select cable for a pump with a pump current of 33 A and an ambient temperature of 52oC:
 Select correction factor for 52oC in the table (0,76)
 Calculate "virtual" current 33 / 0,76 = 44A
 Choose 4 G 6 mm2 at 52oC, rated 54A
Ambient temperature correction factors
According to IEC 60364-5-523 table 52-D1 and NEC table 310-16 (USA/Canada) in air.
Ambient temp.(oC) Correction factor Ambient temp.(F)
21-25
1,04
70-77
26-30
1,00
79-86
31-35
0,96
88-95
36-40
0,91
97-104
41-45
0,87
106-113
46-50
0,82
115-122
51-55
0,76
124-131
56-60
0,71
133-140
61-70
0,58
142-158