kingpb
Senior Member
- Location
- SE USA as far as you can go
- Occupation
- Engineer, Registered
I have been given a drawing of a low voltage 3-phase system that shows a separate lightning arrestor and surge arrestor, at the input from the service.
I went to the ABB site and looked these devices up, and although they indicate them as a "Lightning Arrestor" and "Surge Arrestor", i.e. separate devices, they categorize them as Type 1 and Type 2, SPD's, respectively.
So, what would be any advantage of providing separate devices on a LV system, or are these actually just SPD Category 1 and Catrgory 2 devices? But if so, why Cat 1 and Cat 2 both on at the same location?
Only qualified expertise need apply........
I went to the ABB site and looked these devices up, and although they indicate them as a "Lightning Arrestor" and "Surge Arrestor", i.e. separate devices, they categorize them as Type 1 and Type 2, SPD's, respectively.
So, what would be any advantage of providing separate devices on a LV system, or are these actually just SPD Category 1 and Catrgory 2 devices? But if so, why Cat 1 and Cat 2 both on at the same location?
Only qualified expertise need apply........