this link might help... it all depends (look like more 10% if the margin calculation is done on the tight side - the design should call the shot - literary (: http://ecmweb.com/content/sizing-continuously-loaded-conductors-made- simple have a nice weekend. jk On Sep 11, 2015, at 2:16 PM, Bob Wettermann wrote: > Dear Technetters: > > Had the following question from a client today... > > *...... a question regarding damaged conductors (nicks and scrapes > >10%). * > > > > *I have a 7 stranded wire that is cut and stripped by an outside > supplier > that has multiple wires coming in either nicked or scraped >10% > resulting > in a defect condition. My question is what is the reasoning or > justification behind this accept/reject criteria?* > > > > * I can guess that it may have some limitations regarding current > carrying > capabilities or are subject to latent defects ( severed ) > conditions due to > the end use environment/vibration, corrosive etc.. * > > *My answer has to do this is:* > The ampacity for the conductor is a function of the material > (copper or > aluminum for example) and is based on its physical and electrical > properties of the material. It is the current which can be carried > such > that the material would not up and be destroyed. The absolute value > of this > is a function of the amount of material (a nicked conductor would > have less > ampacity) and the reasons that the maximum deterioration was chosen > to be > 10% was <????> > > Maybe this iso ne of those times, just like you tell your children, > just > because! > > Bob Wettermann > BEST Inc > > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud > service. > For more information please contact helpdesk at x2960 or > [log in to unmask] > ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________