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Article 376 (Part 2 of 2)
Metal Wireways — Support, Splices, Grounding & Construction Specs!

SLIDE 1 — Securing & Supporting (376.30)
📏 HORIZONTAL SUPPORT (376.30(A))
Supported at EACH end and at intervals not exceeding 1.5m (5 ft) — or for individual lengths longer than 5 ft, at each end/joint (unless listed for other intervals). Distance between supports shall never exceed 3m (10 ft).
📏 VERTICAL SUPPORT (376.30(B))
Securely supported at intervals not exceeding 4.5m (15 ft), with NO more than one joint between supports. Adjoining sections must be securely fastened together for a rigid joint.

SLIDE 2 — Splices, Taps & Power Distribution Blocks (376.56)
🔗 SPLICES & TAPS (376.56(A))
Permitted within a wireway if accessible — conductors, splices, and taps combined shall not fill more than 75% of the wireway's area at that point.
🔌 POWER DISTRIBUTION BLOCKS (376.56(B))
🔹 Must be LISTED
🔹 Wireway must meet the block's installation-instruction dimensions
🔹 Wire bending space at terminals must comply with 312.9(B)
🔹 NO uninsulated live parts exposed — cover on or off
🔹 Conductors arranged so terminals stay unobstructed after installation

SLIDE 3 — Dead Ends & Grounding (376.58, 376.60)
🚪 DEAD ENDS (376.58)
Dead ends of metal wireways shall be CLOSED.
🌎 GROUNDING (376.60)
Listed metal wireway CAN be used as the equipment grounding conductor — recognized under 250.118(A)(13).

SLIDE 4 — Extensions & Construction Specs (376.70, 376.100, 376.120) + Final Exam
🔌 EXTENSIONS FROM WIREWAYS (376.70)
Made with cord pendants (per 400.14) or any Chapter 3 wiring method that includes an equipment grounding means — separate EGC connections must comply with 250.8 and 250.12.
🏗️ CONSTRUCTION (376.100)
🔹 Electrical AND mechanical continuity assured throughout
🔹 Substantial construction, complete enclosure, corrosion-protected surfaces — corner joints tight, rivets/bolts/screws spaced ≤300mm (12 in.) apart
🔹 Smooth, rounded bushings/shields/fittings wherever conductors could abrade (bends, partitions, entries to cabinets/boxes)
🔹 Covers securely fastened
🏷️ MARKING (376.120)
Manufacturer's name/trademark must be visible after installation.

🧠 FINAL EXAM QUESTION FOR ARTICLE 376 (Part 2)
Q: Per 376.56(A), splices and taps within a wireway shall not fill the wireway to more than what percentage of its area at that point?
A) 40%
B) 60%
C) 75%
D) 100%
(Drop your final answer 👇)

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