Hi, we have a system that has a C ph. grounded, it's a 480v delta with corner ground. Why is this done and what color would you phase it, since there is no stinger leg? This feeds 2 transformers one with ph. A&B with both legs being protected by a breaker, and the other with ph. A&C and only ph. A being fused. If both are hot legs, why is ph. C not protected? Thank You Dennis Price