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Please find below a table as an indication of cable selection for rated Current.

 

Conventional rated

thermal Current (A)

Cable Busbars
Qty Section (mm2) Qty Dimensions (mm)
 8A 1 1 - -
 12A  1  1.5  - -
 20A  1  2.5 - -
 25A  1  4.0 -  -
 32A  1  6.0  -  -
 50A  1  10 - -
 65A  1  16  - -
 85A  1  25  -  -
 115A  1  35  - -
 150A  1  50  - -
 175A  1  70  -  -
 225A  1  95  - -
 250A  1  120  -  -
 275A  1  150 - -
 350A  1  185  - -
 400A  1  240  - -
 500A  2 X  150 2 X 30 X5
 630A  2 X  185 2 X  40 X 5
 800A  2 X  240  2 X  50 X 5
 1 000A - -  2 X  60 X 5
 1 250A - -  2 X  100 X 5
 1 600A - -  2 X  100 X 5


kW & HP
HP = kW x 1.340
1kW = 1.340 HP
1HP = 746Watt

 

Single Phase
1kVA = 1kW (Power Factor = 1)
kVA = Watt ÷ Amps
Watt = Volt x Amps
Volts = Watt ÷ Amps
Three Phase
kVA = Amps per Phase ÷ 1.52
Power Factor = 0.8 (kW = kVA x 0.8)
kVA = kW ÷ 0.8
   
To Calculate the Amps an Alternator can Produce (provided it is fitted to adequately powered engine)
Single Phase
Amps an alternator can produce
Amps = kVA x 1 000 ÷ 230
Example:
Amps = 12 x 1 000 ÷ 230 = 52A
Three Phase
Amps/Phase an alternator can produce
Amps/Phase = kVA x 1 000 ÷ 400 ÷ 1.732
Example:
Amps/Phase = 20 x 1 000 ÷ 400 ÷ 1.732 = 28.9A/Phase
   
To calculate kVA required when Current (Amps) is known
Single Phase
kVA Required = Amps x 230 ÷ 1 000
Example:
kVA Required = 52A x 230 ÷ 1 000 = 11.96kVA
Three Phase
kVA Required = Amps per Phase ÷ 1 000 x 1.732 x 400
Example:
kVA Required = 28.9A ÷ 1 000 x 1.732 x 400 = 20kVA

 

To determine the kVA the engine can produce AT SEA LEVEL (Note that the same calculations are used for 3 000rpm & 1 500rpm)

Single Phase
kWm x 0.Eff of Alternator = kVA (Divide answer by 0.82 for altitude conditions)
Ex: 7kW x 0.79 = 5.53 kVA at sea level

Three Phase
kWm x 0.Eff of Alternator ÷ 0.8 (PF) = kVA (Divide answer by 0.82 for altitude conditions)
Ex: 10kW x 0.83 ÷ 0.8 (PF) = 10.375 kVA at sea level

 

Engine Selection

kVA x Power Factor ÷ Alternator Eff ÷ 0.746 = HP required at 3 000rpm (or 1 500rpm)
(Power Factor for Three Phase = 0.8 and 1 for Single Phase)
Example:
6kVA x 1 ÷ 0.79 ÷ 0.746 = 10.18 HP on shaft at sea level (Divide answer by 0.82 for altitude conditions)

 

 

Welding Rod SizesHave you ever wondered about what diameter welding rod to use for the current you are welding at?

 

Below follows some indication for you to use:

  • 100A: Ø = 2.5mm
  • 125A: Ø = 3.25mm
  • 130A: Ø = 3.25mm
  • 180A: Ø = 4.0mm
  • 200A: Ø = 4.0mm

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