A nuc (nucleus) hive has all the features of a standard 10-frame hive except on a reduced scale. The nuc hive is used for making splits, swarm control, queen introduction, pollen/nectar monitoring, to name a few. This version is put out by the U.S.D.A.
Download the USDA 5-Frame Nucleus Beehive Plans - PDF format
Here is a Langstroth Nuc version
Download the 5-Frame Langstroth Nuc Plans - PDF format