ICC E3 flashcards

31 cards. Read the term and the definition here. The deck at the top of this page is optional.

NEC Purpose (Article 90)

Article 90 states the Code is a minimum safety standard for practical safeguarding of persons and property from electrical hazards, not a design manual.

Branch Circuit Definition

Per Article 100, the circuit conductors between the final overcurrent device protecting the circuit and the outlet or outlets served.

Mandatory vs Permissive Rules

Mandatory rules use "shall" and must be followed; permissive rules use "shall be permitted" and allow optional methods.

Informational Notes Status

Informational notes in the NEC explain or reference material but are not enforceable requirements; they do not add mandatory rules.

Working Clearance Table

Table 110.26(A)(1) sets minimum depth of working space in front of electrical equipment based on voltage to ground and condition of surrounding surfaces.

Plan Review Submittal Contents

A reviewable electrical plan typically includes load calculations, service and feeder schedules, grounding details, and device/outlet layouts.

Adopted Code Edition

The edition of the NEC in force is the one adopted by the local jurisdiction, which may lag the most recently published edition.

Dwelling General Lighting Load

The general lighting load for dwellings is 3 VA per square foot of floor area, used as the base for the standard calculation.

Small-Appliance Circuit Load

Each 20 A small-appliance branch circuit in a dwelling is calculated at 1,500 VA; at least two such circuits are required.

Laundry Branch Circuit

A dwelling laundry branch circuit is calculated at 1,500 VA and must be a 20 A circuit supplying laundry receptacle outlets.

Continuous Load 125% Rule

Continuous loads are taken at 125% of their value for conductor and overcurrent device sizing; noncontinuous loads are taken at 100%.

Standard OCPD Ratings

Section 240.6 lists standard ampere ratings including 15, 20, 30, 40, 50, 60, 70, 100, 125, 150, 200, 400, and 600 amperes.

Dwelling Receptacle Spacing

In dwelling units, no point on a wall space is more than 6 feet from a receptacle, and wall spaces 2 feet or wider require one.

Optional Dwelling Calculation

The optional method applies 100% of the first 10 kVA of general load plus 40% of the remainder, then adds other loads.

Service Disconnect Rating

The service disconnecting means must have a rating not less than the calculated load and must be sized per the service conductors.

Grounding Electrode Types

Section 250.52 lists electrodes including underground metal water pipe, building steel, concrete-encased electrode, ground ring, rods, and plates.

Ground Rod 25 Ohm Rule

A single rod or pipe electrode must have 25 ohms or less resistance to earth, or a supplemental electrode must be added.

Equipment Grounding Conductor Size

Table 250.122 sizes equipment grounding conductors based on the rating of the overcurrent device protecting the circuit.

Main Bonding Jumper

The main bonding jumper connects the grounded service conductor to the service equipment enclosure and grounding electrode conductor at the service.

GEC Sizing Basis

Table 250.66 sizes the grounding electrode conductor based on the largest ungrounded service-entrance conductor.

Next-Size-Up Rule

Section 240.4(B) permits the next higher standard overcurrent rating if it does not exceed 800 A and load does not exceed conductor ampacity.

GFCI Dwelling Locations

Section 210.8(A) requires GFCI protection for dwelling bathroom, garage, outdoor, kitchen countertop, laundry, and unfinished basement receptacles.

Hazardous Location Classes

Class I covers flammable gases or vapors, Class II combustible dusts, and Class III ignitible fibers or flyings.

Divisions and Zones

Division 1/2 and Zone 0/1/2 designations describe the likelihood of hazardous atmosphere; equipment must be listed for the specific classification.

Health Care Redundant Grounding

Article 517 requires redundant grounding and, in critical-care areas, an insulated/isolated grounding conductor for patient care receptacles.

Assembly Occupancy Rules

Article 518 covers assembly occupancies and addresses emergency lighting, exit illumination, and wiring methods for large occupant loads.

Theaters and Stage Wiring

Article 520 addresses theaters, audience areas, and stages, including portable switchboards and stage set lighting requirements.

Listed and Labeled Equipment

Equipment must be listed by a recognized testing laboratory and installed per its listing; field modification may void the listing.

Dedicated Equipment Space

Section 110.26(E) requires dedicated space above and in front of electrical equipment for access and maintenance, shown on plans.

Permit and Inspection Process

Administrative provisions require a permit, approved plans, scheduled inspections, and final approval before the installation is energized.

Revised Plan Approval

Field changes or deviations from approved plans require revised drawings and re-approval by the authority having jurisdiction before proceeding.