What are the requirements for the large inflatable pools?

A pool permit is required for a "temporary inflatable pool".  Per the Massachusetts State Building Code, as well as some local town by-laws address swimming pools with more than two feet of water in depth, or 200 cubic feel in volume.  An installation of a fence around the pool and any type of removable for fold-up ladder or stairs is required.  The fence should be a minimum of 48" inches in height and the open holes or gaps should not be larger than 4 inches.  It should include a self-closing/latching gate with the release mechanism 54" from the bottom of the gate.  Locking this gate when not in use is a good idea.  Regulations require that the circuit that the pool plugs into be a ground fault protected device and should always be used according to the manufacturer's recommenation for proper sizing of the circuit and wire diamter.  These requirements may appear to be extreme when installing a portable pool, but HUNDREDS of needless deaths occur each year from swimming pool accidents.