I knew about the U.S.-style 120/240 3-wire domestic services, but the 3-phase commercial system sounds fascinating.
If it's really 220 and 440V, then maybe it's an adaptation of the American 4-wire delta, with voltages raised?
Bearing in mind though that these reference sources are often a little less than accurate, I'm wondering if somebody has mixed up the voltage levels and it's really a straight 4-wire wye system at 230/400 or thereabouts. The 440 designation was the standard specified level for the highest nominal voltage system in the U.K. before standardization: 250/440V.
Anyway, why was I asking?
Well, I actually stumbled upon some information on Belize while browsing for real estate, and the place looks quite intriguing.
Real estate listings. Very easy residency requirements, and much lower taxes than in this part of the world. Might need a battery bank and inverters for those power outages though!