Questions and Answers
Which of the following methods is NOT included in the Approved Type of Wiring Methods by PEC?
Which method of wiring allows conductors of both AC and DC systems to occupy the same enclosure?
What regulator must be adhered to when using conductors rated over 600 volts?
Which type of conduit is not mentioned as an approved type in the Raceway Method?
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Which among the following is the most commonly used method in the Raceway Method?
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Which wiring method is typically used for installation that is exposed and visible?
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What is the primary purpose of using a raceway method in wiring?
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Which of the following is correct regarding the use of multiple methods in conducting electricity?
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What is the minimum length of free conductor required at outlets, junctions, and switch points?
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Which wiring method is permitted in ducts and air-handling spaces?
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Which of the following must all parallel conductors provided in a system share?
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What kind of insulation do shielded solid dielectric insulated conductors require if operated above 2000 volts?
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What size must conductors installed in raceways be to qualify as stranded?
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In which locations can insulated conductors and cables of any type be used without restrictions?
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For conductors that are 50 mm2 and larger, what is a requirement when they are used in parallel?
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Which assembly requires that cables and equipment be arranged to allow for panel removal?
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Study Notes
Approved Wiring Methods by PEC
- Conductors on Insulator Method includes:
- Open wiring on insulator: installed exposed
- Concealed knob and tube work: installed hidden within the building structure
- Cable Wiring Method encompasses various cable types:
- Armored (BX) cable
- Metal-clad cable
- Mineral insulated metal sheathed cable
- Non-metallic sheathed cable
- Shielded non-metallic sheathed cable
- Service entrance cable
- Underground feeder & branch circuit cable
- Power and control tray cable
- Flat conductor cable
- Medium voltage cable
- Integrated gas spacer cable
- Raceways provide another method of installation:
- Intermediate metal conduit (IMC)
- Rigid metal conduit (RMC)
- Rigid non-metallic conduit (PVC)
- Electrical metallic tubing (EMT)
- Flexible metallic tubing (FMT)
- Liquid-tight flexible metal/non-metal tubing
- Various surface raceways (metal, wood, non-metallic)
- Underfloor, cellular metal/concrete floor raceways
- Wireways, busways, cable trays, cablebus, flexible metallic conduit
- Multi-outlet assembly
- Most commonly used methods are marked with an asterisk.
Conductors in Different Systems
- For circuits operating at 600 volts or less:
- AC and DC conductors are allowed in the same wiring enclosure, provided insulation ratings match the maximum circuit voltage.
- For conductors over 600 volts:
- Separate enclosures are generally required, except for specific listed combinations (e.g., secondary wiring to electric-discharge lamps, motor conductors).
- In manholes, conductors for each system must be effectively separated.
Wiring Methods Protocols
- Free conductors at outlets, junctions, and switch points:
- Minimum of 150 mm of conductor length must be provided from the point to the raceway or cable sheath.
- Wiring in ducts and air-handling spaces:
- Permissible materials include Type MI and MC cables without non-metallic coverings, EMT, FMT, IMC, and RMC.
General Wiring Specifications
- Cables and raceways must be arranged to allow access to equipment behind panels designed for removal.
- Stranded conductors must be used for sizes 8.0 mm² and larger when installed in raceways.
- Parallel conductors (50 mm² and larger) must:
- Be of the same length and material
- Have identical cross-sectional areas
- Use the same insulation type
- Be terminated uniformly
- Shielded solid dielectric insulated conductors over 2000 volts require ozone-resistant insulation.
Location-Based Guidelines
- Dry locations allow the use of insulated conductors and cables of any type.
- Dry and damp locations require specific cable types like FEP, MTW, RHH, THHN, etc.
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Description
This quiz covers the various approved wiring methods as outlined by the PEC. It includes details on conductors on insulator methods, cable wiring types, and raceway installations. Test your knowledge on different wiring techniques and standards in electrical installations.
