From our long experience of providingindustrial battery charger solutionsto our customers and partners, we have seen that there are some basic questions that are always asked. One of the basic questions we are always asked by our valuable customers is “what are the formulas needed to do the power cable sizing calculations?” Here we are sharing the basic formulas for your convenience.
CHARGER SIZING FORMULAS
WIRE GAUGE TABLE
SOURCE: Handbook 100 National Bureau of Standards.
NOTE: All wire size #6 and larger is stranded.
* All sizes larger than #0000 are expressed in MCM.
1. Calculating wire size requirements:
CMA = A x LF x K / AVD
2. Calculating current carrying capacity of wire:
MAX. AMP = CMA x AVD / LF x K
Here,
CMA = Cross section of wire in circular MIL area
A = Ultimate drain in amperes
LF = Conductor loop feet
MAX. AMP = Maximum allowable amperes for given voltage drop
AVD = Allowable voltage drop
K = 11.1 constant factor for commercial (TW type) copper wire (KS5482-01)
= 17.4 for aluminum (KS20189)
Conclusion:
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