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What are the formulas to do the Power cable sizing calculation?

What are the formulas to do the Power cable sizing calculation?
03 Nov 2021

From our long experience of providing industrial battery charger solutions to 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:

EverExceed has a vast experience when it comes to industrial chargers, and we are satisfying our partners and customers pain points with the most efficient and precise state of art dc power solution consistently. If you have any requirement or any kind of query regarding the industrial battery & rectifier battery charger, feel free to communicate with our dedicated team at any time.

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