2023 230.67 SPD Location and "number of" Question

tronic

Member
Location
Denver, Colorado
Occupation
Master Electrician
Hi All,
There seems to be some debate, at my shop any way, about where and when SPD's are required. Take the following questions... How many SPD's would be required on a New Service on Existing SFD that has an 80A Sub- Panel (Sub- Panel is also new and in the basement)? Then the same question when the New Sub is in a detached garage. Finally, when the New Sub is in a Detached ADU?
 
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