CO Electrician cheat sheet

Colorado electricians are licensed by the State Electrical Board within the Division of Professions and Occupations (DORA); the Board adopts rules and the NEC edition enforced in Colorado.

License tiers: apprentice, residential wireman, journeyman, and master electrician; each tier has its own scope of work and supervision requirements.

Master electrician applicants must document substantial qualifying experience (commonly four years) plus pass the master exam; journeyman applicants document roughly four years of field experience.

A residential wireman is limited to one-family and multifamily dwellings and does not cover commercial or industrial wiring.

Apprentices must be registered with the Board and work under direct supervision of a licensed journeyman or master electrician.

Licensees must carry the license or a copy and display it on request of the Board or its designee; licenses are renewed on a fixed cycle set by Board rule.

Grounds for discipline include unlicensed practice, code violations, fraud in obtaining a license, and failure to supervise apprentices; sanctions range from reprimand to revocation and fines.

The Board publishes the adopted NEC edition and any Colorado amendments; where state amendments differ from the NEC, the state amendment controls.

Ohm's law: E = I x R; power: P = I x E (single-phase) and P = 1.732 x I x E x PF for three-phase loads.

Voltage drop for single-phase: VD = 2 x K x I x L / CM, where K is the conductor constant, I is amperes, L is one-way length, CM is circular mils.

Ampacity of conductors is adjusted for ambient temperature and for more than three current-carrying conductors in a raceway (Table 310.15(B)(3)(a) adjustment factors).

Continuous loads are calculated at 125 percent of the load; the overcurrent device must be sized to the calculated load.

Standard branch-circuit ratings include 15, 20, 30, 40, 50, and 60 amperes; receptacle outlets on 15- and 20-A circuits follow the specific Article 210 rules.

GFCI protection is required in dwelling bathrooms, kitchens, garages, outdoors, and other listed locations; AFCI protection is required for most dwelling branch circuits.

Equipment grounding conductors must be sized per NEC Table 250.122 based on the rating of the overcurrent device protecting the circuit.

Working space in front of electrical equipment is at least 30 inches wide, 36 inches deep, and 6.5 feet high, with clearances increasing with voltage to ground.

An electrical permit is required before starting work; permits are issued by the local authority having jurisdiction (AHJ) or the State Electrical Board where no local program exists.

Permit applications identify the owner, contractor, scope of work, and the license number of the responsible electrician.

Inspections are scheduled in phases: rough-in before covering walls, and final after devices and fixtures are installed and the system is energized and tested.

Work must be accessible for inspection; concealed work not inspected at rough-in may be required to be exposed at the contractor's expense.

The AHJ may require correction notices; re-inspection fees apply when work fails or when the contractor is not ready at the scheduled time.

A certificate of occupancy or final approval is issued only after the final inspection passes and all fees are paid.

Temporary power installations require their own permit and inspection before use on a job site.

Unpermitted work discovered later can result in stop-work orders, fines, and required removal or exposure of the installation for inspection.

Colorado electricians renew licenses on a set cycle (commonly every three years); renewal requires completing the continuing education hours required by Board rule.

Continuing education hours must include a specified portion of code-update training covering the currently adopted NEC edition.

Acceptable CE providers and courses are those approved by the Board; courses must relate to electrical work, code, or safety.

Licensees must keep certificates of completion for the audit period and produce them if requested by the Board.

Late renewals may incur a fee and, after a grace period, may require reinstatement or reexamination.

Continuing education credit is generally not granted for repeating the same course within a single renewal cycle.

Inactive or expired licenses cannot be used to pull permits or perform electrical work until reinstated.

Renewal notices are sent to the address on file; failure to update the address does not excuse a missed renewal deadline.