Questions tagged [ampacity]
A portmanteau combining the words for Amperage and Capacity. Defined as the maximum current (Amperage) that a device or conductor can carry without sustaining immediate or progressive deterioration. Defined in some electrical codes.
32 questions
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1 answer
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Smaller Gauge Wires in Parallel
I've long been aware of the strategy of running two smaller wires in parallel when, for instance, a single larger gauge wire isn't physically feasible, but I know it's not a common practice. I just ...
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0 votes
1 answer
282 views
Bare copper wire as a fuse
Consider building a fuse using bare copper wire, so as to melt fast at 60 A. What would be the cross section area of this wire? (I tried searching online for tables, but the results were confusing and ...
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-1 votes
1 answer
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Ampacity rating of a wire
Is the ampacity rating of a wire only pertains to the current rating? For example, if I have a 14awg wire and has a load of 10VDC/30A, is this the same as 100VDC/30A load? I understand that they will ...
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2 votes
4 answers
932 views
What's the purpose of temperature ratings of conductors (wires)?
In countries governed by the NEC (like the US), insulated wires typically have insulations with 60, 75 or 90°C temperature rating. Wires have listed ampacities based on their insulation and other ...
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-2 votes
1 answer
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Can a 50mm2 cable handle 350 amperes?
Can a one meter 50mm2 cable handle 350 amperes? Of course the measuring is approximate since the cable is flexed.
0 votes
1 answer
314 views
Maximum current in MIL-spec D38999 circular connectors
Talking about d38999, does a current/contact heat diagram exist? What a normal d38999 contact temperature can reach before getting damaged? Datasheet of various vendor display a nominal ampacity that ...
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1 vote
1 answer
241 views
How does the Skin Effect at RF frequencies affect wire ampacity?
Through simulation we can find the current going through an inductor that is part of a filter network and this 1-sheet paper points out that ampacity diminishes with higher frequency because of the ...
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0 votes
1 answer
93 views
Ampacity In Ungrounded Conductors, (Sub-Panels, and Loads)
I am 2nd year 1st semester student at Independent Electrical Contractors of Rocky Mountain. This question is from our final Review: This is a fairly straightforward Ohm's law question. Each ...
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4 votes
5 answers
6k views
How to optimise wire gauge selection for electromagnetic applications?
Disclaimer: Hobbyist "maker" with limited experience and no relevant education. Please considerate and answer in detail. Feel free to skip to "Question". Context I have an ...
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1 vote
3 answers
3k views
Why are AWG charts rated in amperes and not in watts? [duplicate]
American wire gauge chart is rated in Ampacity. Isn't it wise to be rated in watts? Let say a wire is rated to conduct a certain amount of current what's going to happen when the voltage goes higher ...
user140351
1 vote
2 answers
24k views
NEC Ampacities Data
This data shows the Allowable Ampacities of Insulated Conductors Rated 0 to 2000V, for Copper conductors, as listed in the NEC NFPA 70E Table 310.16, used for estimating the current ratings for power ...
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1 vote
2 answers
273 views
Why would this power mosfet be made in a surface mount package?
I’m looking at the CSD17303Q5 power mosfet which boasts a 100A max drain current. It confuses me why they have it in a VSON surface mount package because most pcbs would not be able to handle that ...
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1 vote
5 answers
6k views
Derating ampacity of a wire if it is stranded?
Do I need to derate a wire if it is stranded? Or will a #12 wire have the same ampacity whether or not it is stranded? Is this affected at all by AC versus DC?
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0 votes
1 answer
230 views
Battery connector and wire ampacity
I’m considering using a JST ACH connector with my LiPo, but I don’t understand whether the current rating on the data sheet is for aggregate or for each wire individually (which is my guess since they ...
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6 votes
4 answers
5k views
Ampacity of Conductive Tape
How do I measure ampacity of conductive tape? I want to replace a wired battery to equipment connection with copper adhesive tape because I need a very low profile on the connection. The maximum ...
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