Three phase meter enclosure is specially designed for anti-tamper and protection of the meter. One BS type meter can be mounted with a bottom connection. The enclosure with two separated transparent windows, a non-transparent/transparent top cover, and a non-transparent base. The material of the enclosure is polycarbonate with UV resistance and V0 frame resistance degree. Pole-mounted or wall-mounted or lock and key protection are based on project demand. The alarm sensor for enclosure opening is a reserved function. Its up cover and base can be stacked, greatly saving the volume of product transportation.