DE Electrician flashcards

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

Delaware master electrician experience

Applicants for the Delaware master electrician license must document years of qualifying field experience under a licensed electrician, verified in writing, before Board approval to sit the exam.

Delaware license types

Delaware issues master, journeyperson, and limited electrician licenses through its Board of Electrical Examiners; each carries a defined scope of work and separate experience and exam requirements.

Delaware continuing education

Delaware electricians must complete Board-approved continuing education hours each renewal cycle to keep the license active; unapproved courses do not count toward the requirement.

Delaware permit responsibility

In Delaware, the licensed master electrician is responsible for obtaining electrical permits and for ensuring that all work performed under that license complies with the adopted code.

Ohm's law

Ohm's law states that voltage equals current times resistance (E = I × R). It is used to find the third quantity when two are known in a resistive circuit.

Power formula

Electrical power in a resistive circuit is P = E × I, equivalent to I²R or E²/R. In AC circuits, real power equals E × I × power factor.

Parallel circuit resistance

In a parallel circuit, voltage is equal across branches and total resistance is less than the smallest branch. Use 1/RT = 1/R1 + 1/R2 to compute it.

Three-phase power

For a balanced three-phase load, real power equals √3 × line voltage × line current × power factor. This formula is used for feeder and service load calculations.

Continuous load rule

NEC requires continuous loads, those operating three hours or more, to be calculated at 125% of their rating when sizing branch-circuit conductors and overcurrent protection.

Working clearance 110.26

NEC 110.26 requires a minimum 36-inch-deep working space for equipment up to 150 volts to ground, 30 inches wide, and 6 feet 6 inches of headroom.

GFCI required locations

GFCI protection is required by NEC 210.8 in bathrooms, garages, outdoors, kitchens, laundry areas, unfinished basements, and other listed locations for personnel protection.

Equipment grounding conductor sizing

The equipment grounding conductor is sized from NEC Table 250.122 using the rating of the overcurrent device protecting the circuit, not the size of the circuit conductors.

Box fill calculation

NEC 314.16 counts each conductor, device yoke, and clamp as a specific volume in cubic inches, and the total must not exceed the box's marked capacity.

NM cable support

Nonmetallic-sheathed cable must be secured within 12 inches of each box and supported at intervals not exceeding 4.5 feet along its run.

EMT support spacing

Electrical metallic tubing must be supported within 3 feet of each box and at intervals not exceeding 10 feet, using listed straps and fittings.

Conductor color identification

Grounded conductors are white or gray, equipment grounding conductors are green, green with yellow stripe, or bare, and the high-leg of a four-wire delta system is orange.

Subpanel neutral bonding

In a subpanel, the neutral bar must be isolated from the enclosure and grounding bar; the neutral-to-ground bond is made only at the service equipment.

Lockout tagout procedure

De-energize the circuit, verify absence of voltage with a properly rated tester, apply a lock and tag, and treat conductors as energized until proven otherwise.

NFPA 70E approach boundaries

NFPA 70E defines limited and restricted approach boundaries; unqualified persons may not cross the limited boundary, and restricted work requires qualified persons with rated PPE.

Inspection sequence

Electrical inspections typically proceed from rough-in, before walls are closed, to final inspection after devices, equipment, and labeling are complete and the system is ready to energize.

Meter category rating

Test instruments must carry a CAT rating matching the circuit; CAT III covers distribution and feeder work, and CAT IV covers service and utility-side measurements.

Delaware permit authority

Electrical permits in Delaware are issued by the local city or county authority having jurisdiction, or by the state where no local authority exists, and work requires inspection.

Unlicensed contracting penalty

Performing electrical contracting in Delaware without a license can result in fines, stop-work orders, permit denial, and refusal of future licensure by the Board.

Dwelling lighting load

NEC general lighting load for dwellings is 3 volt-amperes per square foot of floor area, with small-appliance and laundry branch circuits counted separately at 1,500 VA each.

Ampacity adjustment factors

Conductor ampacity is adjusted for ambient temperature using Table 310.15(B)(2)(a) and for more than three current-carrying conductors in a raceway using Table 310.15(B)(3)(a).

Main bonding jumper

The main bonding jumper connects the grounded service conductor to the service equipment enclosure at the service disconnect, establishing the fault current path to the source.

Grounding electrode resistance

A single ground rod must be supplemented by an additional electrode unless it demonstrates 25 ohms or less resistance to earth, per NEC 250.53.

Motor full-load current tables

Motor full-load current for conductor and protection sizing comes from NEC Tables 430.247 through 430.250 by horsepower and voltage, not from the motor nameplate.

Motor overload protection

Running overload devices protect motors from overheating and are sized from nameplate current, typically 115% to 125%, depending on service factor and temperature rise.

Raceway fill percentages

NEC Chapter 9 Table 1 limits raceway fill to 53% for one conductor, 31% for two conductors, and 40% for three or more conductors.

Class I Division 1

A Class I Division 1 location is one where flammable gases or vapors are present under normal operating conditions, requiring listed explosionproof equipment and wiring methods.

Intrinsically safe circuit

An intrinsically safe circuit limits electrical energy so that no spark or thermal effect can ignite the hazardous atmosphere; it must be separated and identified per Article 504.

Tamper-resistant receptacles

NEC 406.12 requires tamper-resistant receptacles in dwelling units and other specified areas to protect children from inserting objects into receptacle slots.

Luminaire installation

Luminaires must be listed and installed according to the manufacturer's instructions, with required clearances from insulation and combustible material maintained as marked.