Wiring Methods and Materials Flashcards

Flashcards on Wiring Methods and Materials based on PEC

Open Wiring on Insulator

A wiring method installed exposed.

Concealed Knob and Tube Work

A wiring method installed hidden by a portion of the building.

Armored (BX) Cable

A cable wiring method.

Intermediate Metal Conduit (IMC)

A raceway method commonly used by practitioners.

Rigid Metal Conduit (RMC)

A commonly used raceway method often used by practitioners.

Rigid Non-Metallic Conduit (PVC)

A commonly used raceway method often used by practitioners.

Metallic Surface Raceway

A commonly used raceway method often used by practitioners.

Wooden Surface Raceway

A raceway method commonly used by practitioners.

Non-Metallic Surface Raceway

A raceway method commonly used by practitioners.

Conductors of Different Systems (600 Volts or Less)

AC and DC conductors can occupy the same wiring enclosure if all conductors have an insulation rating equal to the maximum circuit voltage.

Conductors of Different Systems (Over 600 Volts)

Conductors rated over 600V shall generally not occupy the same equipment wiring unless specifically permitted (e.g., secondary wiring to electric-discharge lamps).

Cable and Raceways Through Wood Members

Wiring through wood members requires bored holes or notches; protection is needed near edges.

Insulated Fittings

Raceways containing ungrounded conductors 22 mm2 or larger entering an enclosure require protection by a substantial fitting with a smoothly rounded insulating surface.

Conductors in Raceways

Must be continuous between outlets, boxes, and devices without splices or taps within the raceway (unless permitted).

Free Conductor Length at Outlets

A minimum of 150 mm of free conductor is required at each outlet, junction, and switch point for splices.

Wiring in Ducts, Plenums, and Air-Handling Spaces

Permitted materials include Type MI cable, Type MC cable without non-metallic covering, EMT, and IMC without non-metallic covering.

Conductor Bending Radius (Nonshielded)

The bending radius shall not be less than 8 times the overall diameter.

Conductor Bending Radius (Shielded or Lead Covered)

The bending radius shall be 12 times the overall diameter.

Stranded Conductors in Raceways

Conductors installed in raceways, size 8.0 mm2 and larger, shall be stranded.

Conductors in Parallel

Conductors that are 50 mm2 and larger (aluminum, copper-clad aluminum, copper) are permitted to be in parallel.

Shielded Conductors

Solid dielectric insulated conductors operated above 2000 volts shall have ozone resistant insulation and shall be shielded.

Required Conductor Markings

All conductors and cables shall be marked with maximum rated voltage, type, manufacturer's name, and size.

Suffix D

Two insulated conductors lay parallel with nonmetallic covering.

Suffix M

Assembly of two or more insulated conductors, twisted spirally with nonmetallic covering.

Aluminum Conductor Material

All aluminum alloy conductors shall be made of AA-8000 series electrical grade aluminum.

Armored Cable (Type AC)

A fabricated assembly of insulated conductors in a flexible metallic enclosure.

Armored Cable Bending Radius

The radius of the curve not less than 5 times the diameter.

Armored Cable Securing

A cable must be secured 300 mm within every outlet box, junction box, cabinet.

Integrated Gas Spacer Cable (Type IGS)

A factory assembly of one or more conductors, each insulated and enclosed in a loose-fit, nonmetallic flexible conduit.

Type IGS Bends

Shall not contain more than the equivalent of four quarter bends (360 degrees).

Flat Cable Assemblies (Type FC)

An assembly of parallel conductors formed integrally with an insulating material web for field installation in surface metal raceway.

Cablebus

An assembly of insulated conductors in a completely enclosed ventilated protective metal housing.

Cellular Metal Floor Raceway

Hollow spaces of cellular metal floors, with fittings, approved as enclosures for electric conductors.

Header

Transverse metal raceways for conductors, providing access to predetermined cells of a precast cellular concrete floor.

Concealed Knob-and-Tube Wiring

A wiring method using knobs, tubes, and flexible nonmetallic tubing for the protection and support of single insulated conductors.

Concealed Knob-and-Tube Wiring Clearances

75 mm between conductors and 25 mm between the conductor and surface.