Quick Hits

EPISODE 8 — THE 24-INCH NIPPLE

SLIDE 1 — WAIT... 40% ISN'T ALWAYS THE NUMBER

👀

There's an important Chapter 9 Table 1 note involving:

RACEWAY NIPPLES

SLIDE 2 — THE 24-INCH RULE

Under the applicable Chapter 9 Table 1 note:

A nipple not over 24 inches between boxes, cabinets, or similar enclosures can have a permitted fill of:

🔥 60%

instead of the normal Table 1 percentage.

SLIDE 3 — DON'T TURN IT INTO A JOBSITE MYTH

🚨 THIS DOES NOT MEAN:

“It's a short conduit, so I can fill it however I want.”

You still need to satisfy the specific conditions of the NEC exception/note.

And remember:

Fill ≠ Ampacity

Different calculations can still apply.

SLIDE 4 — EXAM CHECK

A qualifying nipple is:

24 inches or less

What fill percentage does Chapter 9 Table 1 Note 4 permit?

A️⃣ 31%

B️⃣ 40%

C️⃣ 53%

D️⃣ 60%

🔥 ANSWER: D — 60%

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