This is in terms of military property acocuntability.
Yes it depends, are we talking about a power cable for a piece of radio equipment? Then yes. Are we talking about a power cable for a government computer? Then no. What I can tell you is that if it's a power cable for a piece of radio/communications equipment then its Class 9 expendable. As far as other cables, maybe you could try looking on Army Property Book or FED Log; you may have more luck there.
Like so many answers: it depends. A power cable for a desk top computer is usually expendable. A power cable running from a generator to a junction box is not. or property book will tell you what it is.
