Code Hunter – Signs, Part I, 2017 NEC

Reading Time: < 1 minute

To play this game, you need a sharp eye, a quick mind, and a 2017 National Electrical Code book.

(Fill-in-the-blank questions are looking for the exact word(s) used in the NEC.)

1. ____________________ equipment shall be marked with the name, trademark, or other descriptive marking by which the organization responsible for reconditioning the electrical equipment can be identified, along with the date of the reconditioning.
2. A switchboard, switchgear, or panelboard containing a 4-wire, __________-connected system where the midpoint of one phase winding is grounded shall be legibly and permanently field marked as follows: “Caution _____ Phase Has _____ Volts to Ground”
3. Warning signs shall be __________ posted at points of access to conductors in all conduit systems and cable systems. The warning sign(s) shall be legible and permanent and shall carry the following wording: DANGER—HIGH VOLTAGE—KEEP OUT
4. Informational Note: ANSI __________-2011, Product Safety Signs and Labels, provides guidelines for suitable font sizes, words, colors, symbols, and location requirements for labels.
5. Where a building or structure has any combination of feeders, branch circuits, or services passing through it or supplying it, a permanent plaque or directory shall be installed at each feeder and branch-circuit __________ location denoting all other services, feeders, or branch circuits supplying that building or structure or passing through that building or structure and the area served by each.
6. A permanent and legible __________ diagram of the local switching arrangement, clearly identifying each point of connection to the high-voltage section, shall be provided within sight of each point of connection.
7. Electrical equipment, such as switchboards, switchgear, panelboards, industrial control panels, meter socket enclosures, and motor control centers, that is in other than __________, and is likely to require examination, adjustment, servicing, or maintenance while energized, shall be field or factory marked to warn qualified persons of potential electric arc flash hazards.
8. Electrode-type boilers must be marked with a warning stating that: “All Power Supplies Shall Be Disconnected Before Servicing, Including Servicing the Pressure Vessel.”
9. On a 4-wire, delta-connected system where the midpoint of one phase winding is grounded, the conductor or busbar having the higher phase voltage to ground is permitted to be identified by an outer finish that is orange in color.
10. If a new voltage distribution system is added to an existing building, every branch circuit termination, splice and connection in the existing voltage system(s) must be identified by line, phase and system.


Bonus Question

[mlw_quizmaster quiz=5]

About the Author

Christel Hunter is vice president of engineering for Cerro Wire. Chris is a senior associate member of IAEI and a senior member of IEEE. She serves as a board member for the Southern Nevada Chapter of IAEI and the Las Vegas Section of IEEE. Chris also serves on NEC CMP-6 and CMP-13 and NFPA 921. Chris is a Certified Standards Professional, Master Electrician, and LEED Accredited Professional.