While I totally see what @Anon is saying, my perspective is slightly different based on helping out some friends last year. This (2015) was their first year of keeping bees, ever…
They picked up 2 nucs late season - end of June, both 5 frames. They installed them in 10 frame Langs with 5 frames of wax foundation. The seller told them that the nucs were strong, no need to feed. In fact he told them that they may need another brood box very soon. They didn’t really know what they were doing, and they didn’t mention the bees to us until mid August. We offered to go and inspect the hives with them.
We were concerned with what we found. They had put another brood box on top of the nuc box. Some of the foundation was drawn, but there was no honey. The lower boxes both had some brood, with a decent pattern, scant pollen and very little honey. Most of the foundation was at least partially drawn, but a lot of it was empty comb. We immediately recommended feeding, but they had no feeders and didn’t want to go against their nuc seller’s advice. We recommended removing the second box, as the lower box had so much space. They didn’t do that. They started feeding (with Boardman entrance feeders, ugh) in late September.
By November, their hives were empty - they didn’t tell us until yesterday, so we didn’t get a chance to do a proper post-mortem. Either the bees absconded, or they died out from starvation or disease.
My point is, if you are starting a hive from a nuc late in your honey flow, or in a nectar dearth (drought counts too), you need to watch the brood box food levels very carefully. Great, if you are awash with honey and pollen, don’t feed. Personally, I consider starting a nuc in late June/July in the northern hemisphere, or late January in the southern is probably a precarious time. Your local beekeepers will know better than I, but I really hate to see bees starve. Just my experience, your mileage can and will vary! 
All the best to all of our bees,
Dawn