According to NEC Table 450.3(B), for more than 9 amps for primary and secondary protection; the primary protection max is 250% and the secondary protection is sized at 125% max of the transformer rated current.
Is there any issue sizing both the primary and secondary at 125%? When doing renovation projects sometimes we try to reuse the existing conduits and wiring to save money. So the primary side might end up being only 125%.
Is there a rule of thumb that if you size the secondary at 125% the primary should be at least XXX%? Understand that there are different types of breakers and many breakers you can adjust the trip curves.
Any help would be appreciated.
Is there any issue sizing both the primary and secondary at 125%? When doing renovation projects sometimes we try to reuse the existing conduits and wiring to save money. So the primary side might end up being only 125%.
Is there a rule of thumb that if you size the secondary at 125% the primary should be at least XXX%? Understand that there are different types of breakers and many breakers you can adjust the trip curves.
Any help would be appreciated.