How to calculate the cross section of splice/tap

Status
Not open for further replies.

Jin Kim

Member
Location
USA
Occupation
Electrical Engineer
Just want to check out how do we literally calculate the cross section of the "splice/tap"
Sorry for the novice inquiry, but from wireway article 376.56 (NEC 2020) I see following requirement.

"Splices and taps in metal wireways must be accessible, and they are not permitted to fill the wireway to more than 75 percent of the wireway’s cross-sectional area."
How do we actually calculate the cross section of a splice/tap?

for example suppose we have;
a) 3" x 3" wireway = 9 sqin
b) (10) 14 THHW wires (csa 0.0139 sq.in each) = 0.139 sqin
c) splice kits for (6) THHW wires = How do we calculate this part?
 

LarryFine

Master Electrician Electric Contractor Richmond VA
Location
Henrico County, VA
Occupation
Electrical Contractor
Simple measurement? Staggered positioning minimizes crowding.

It's almost impossible to actually fill a wireway to 75% of capacity.
 
Status
Not open for further replies.
Top