Will power cable work well as speaker cable?

Ebm,
Read the last post. Well good luck

Update:
I replaced the power cable with 12ga oyaide speaker wire. Now using the power cable as it was designed to be used. Although it worked well as speaker cable I couldn't get past the fact that it wasn't designed for it. That and in my experience I get more bang for the buck (sound improvement wise) with power cables in my system than speaker cables. The beauty of this upgrade is that I now have Oyaide Tunami power cables going to all the electronics (except the TT motor) associated with the analog portion of my system. I will be replacing the IC's with Oyaide as well as soon as funds allow. There is simply something very right about this wire. 

timlub, I searched "romex" in the archives & got over 1200 results. I didn't look for 10/5 romex, but it may be there.  

No problem williewonka, I appreciate your suggestions. 

Well I have the Oyaide Tunami power cord set up as speaker cable. They replaced Morrow SP5's. They are still "cold" & there is the tinge (slight grain) in the treble that these cables have until about 100 hours (they gradually lose this). There is something about this wire that I absolutely love. There is a there, there. That wasn't much of a sentence, but maybe you know what I mean. Even when they are cold I have more depth, width, & detail than I had with the morrows. Don't get me wrong, the morrows are not bad at all but there is a purity to these wires that is fantastic in my system.
Toddverrone, I really want to try the shield to see if it's an improvement in this application. If they don't work out that way I'll use them as designed (imagine that) for power cords & buy the across 2000 speaker wire or one that williewonka recommended above. 
williewonka, The thing I like about asking questions here is getting sincere recommendations from other audiophiles. Thank you for that. 

Thanks treadman, I'll keep them in mind in the future

Treadman,
Yes, that is what I'm looking for. Have you ever done business with them? 
lak & bar81,
I agree that Chris is a great guy to work with. I took your advice and asked him. He said it will work as speaker cable. He isn't fond of shielded speaker cable though which is why he carries the Across 2000 instead of the Nigo. I'm going to try it. Worst case if I don't like the results, I'll make 2 more power cords out of it. Thanks for the suggestion.