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coolyaar
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Join Date: Jul 2011
Posts: 286
Good Answers: 1

Solid vs Stranded Conductor Ampacity

08/08/2011 12:29 PM

i have a piece of 120mm2 of solid conductor and one piece of same length and area i.e. 120 mm2 of stranded conductor , both of aluminium. which one will have greater ampacity and why ? is there any role of skin effect in stranded conductor.
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SimpleMind
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Join Date: Sep 2009
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#1

Re: Solid vs Stranded Conductor Ampacity

08/08/2011 3:37 PM

a. Stranded wire with same area with a solid conductor theoretically will handle more ampacity, but only because of the bigger cooling surface.

b. At VHF and over, yes. S.M.

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JRaef
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United States - Member - New Member Engineering Fields - Power Engineering - New Member

Join Date: Sep 2006
Location: California, USA, where the Godless live next door to God.
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#2
In reply to #1

Re: Solid vs Stranded Conductor Ampacity

08/08/2011 7:03 PM

Trick question (or incompete data) because it depends. Skin effect only counts in AC circuits. Cross Secional area is all that matters in DC.

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Anonymous Poster #1
#3
In reply to #2

Re: Solid vs Stranded Conductor Ampacity

08/08/2011 7:08 PM

Already narrowed it to VHF and above. (LOL) S.M.
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rockraiden
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Engineering Fields - Power Engineering - New Member

Join Date: Aug 2010
Posts: 111
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#4

Re: Solid vs Stranded Conductor Ampacity

08/10/2011 12:36 AM

try this expirement...count the numbers of conductors of the stranded 120 mm2 then take the cross sectional area of one of the strand multiply it with the number of conductors..this now wil be your new cross sectional area...it'll be slightly different from the solid 120 mm2...use 1.55A/mm2(for bare copper but just for justification) ratio..now you will have your answers...although stranded conductors have lesser skin effect than that of the solid ones..but again, when the system is DC, skin effect is neglected...

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