Branch Circuits & WiringQuestion 142 of 521
For 1/2-inch through 3/4-inch trade size rigid metal conduit (RMC), what is the maximum spacing between supports on a straight horizontal run per Table 344.30(B)?
a.6 ft
b.8 ft
c.10 ft
d.14 ft
Explanation
Table 344.30(B) permits a maximum support spacing of 10 ft for 1/2-in and 3/4-in RMC. Larger conduit sizes allow greater spacing. 6 and 8 ft are stricter than needed; 14 ft applies only to larger trade sizes such as 2.5 in and above.
Law Reference: 2023 NEC §344.30(B)Practice all 521 questions free — no signup required.
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