MEMINS0081A Cut, Bend, and install electrical conduits

1. Electrical Technology
Cut, Bend, and
install electrical
conduits
Stephen Jones

2. Objectives
• Identify the types, sizes, and application of PVC conduits
• State the advantages and disadvantages of using PVC conduits.
• Identify fittings and fixtures used in the installation of PVC conduits.
• Given practical exercise, select tools and materials that conform to
requirements.
• Make right-angle (90 degrees) bend in PVC conduit.
• Given materials, Connect fittings to PVC.
• State the tools requires when working with PVC conduits.
• Bends must be 90 degrees and without kinks.
• Conduit must be measured, cut, and bent accurately to minimize
waste

3. PVC - Polyvinyl chloride
• The third-most widely produced plastic.
• Used in construction because it is more effective
than traditional materials such as copper, iron or
wood in pipe and profile applications.
• It is also used in clothing and upholstery, electrical
cable insulation, Pipes (electrical and water),
inflatable products, and many applications in
which it replaces rubber.

4. Types of PVC pipes
 Metal conduits
 Non-metal conduits
 Flexible conduits

5. Metal conduits
• Electrical metallic tubing (EMT), sometimes
called thin-wall, is commonly used instead of
galvanized rigid conduit (GRC), as it is less
costly and lighter than GRC.
• More common in commercial and industrial
buildings than in residential applications. EMT
is generally made of coated steel, though it
may be aluminum.

6. Electrical metallic tubing

7. Non-metal conduits
• PVC conduit
• Rigid Nonmetallic Conduit (RNMC)
• Electrical Nonmetallic Tubing (ENT)

8. Non-metal Conduits
• PVC conduit is the lightest in weight
compared to other conduit materials, and
usually lower in cost than other forms of
conduit. The plastic material resists
moisture and many corrosive substances.
• PVC conduit may be heated and bent in
the field.

9. PVC conduit

10. Flexible conduits
• Flexible conduits are used to connect to
motors or other devices where isolation
from vibration is useful, or where an
excess number of fittings would be
needed to use rigid connections. Electrical
codes may restrict the length of a run of
some types of flexible conduit.

11. Flexible conduits
• Flexible Metallic Conduit (FMC) – used in
dry places.
• Liquidtight Flexible Metal Conduit (LFMC)
– water resistant.
• Liquidtight Flexible Nonmetallic
Conduit (LFNC) - flame-resistant,

12. Sizes of PVC Conduits.
• PVC Electrical
Conduit Pipes are
available in sizes
of 20mm, 25mm,
32mm, 40mm,
50mm, & 63mm.
• 3m Lengths

13. Advantages of using PVC
Conduits.
• Light in weight
• Easy to saw cut and clean.
• Easy to bend.
• Minimal condensation due to low thermal
conductivity in wall of conduit.
• Cheap
• Excellent electrical and fire resistant
properties

14. Disadvantages of using PVC
Conduits.
• If insufficient adhesive is used the joints may not be
waterproof.
• PVC expands about 5 times as much as steel and this
expansion must be allowed for.
• PVC does not offer the same level of mechanical
protection as steel.
• A separate Circuit Protective Conductor must be run
inside the conduit.

15. Fittings and fixtures used in the
installation of PVC conduits.
Saddles
• The saddle, is the device used for fixing
conduit, they provide a very secure method
of fixing for conduits.

16. Saddles
Plain Saddle Space bar Saddle

17. Coupling

18. Tee

19. surface junction box

20. Tools used when working with
PVC Conduits
• Measuring tape
• Junior saw
• Spring bender

21. Types of Bends
• Right angled Bend
• Offset and Double Offset Bend