H1 LT2 Flashcards
Why is it important to install a plastic meter cover over the meter socket?
Prevents shock hazard when energized
What type of cable does the supply authority usually use?
Neutral-supported cable, type NS75
What type of insulation is used for 10 AWG cable?
Polyethylene or XLPE
What are the consumer responsibilities in relation to an electrical service?
Installation of equipment and conductors between the service head and main switch
Where are underground supply conductors fed from?
Transformer
What does the CEC define grounding as?
Permanent and continuous conductive path to the earth.
What must be secured at the main service box to ensure bonding conductors are connected to the grounding conductor?
Bonding screw (or strap)
What are the two ways to manufacture a field-assembled grounding electrode?
Directly buried bare copper conductor or bare copper conductor encased in concrete footings
When using in-situ grounding electrodes, what is the requird depth for metallic reinforcement of concrete slab, concrete piling, or concrete foundation and iron pilings?
600 mm below finished grade
What types of manufactured electrodes are there?
Concrete-encased plate electrode, plate electrode, rod electrode
Where should the grounding conductor be connected when an in-situ grounding electrode is used?
As close as possible to where the water pipe enters the building
Which two items bond the grounded conductor bus to the metal enclosure of the service box?
Bonding jumper, bonding strap
How are the conductors in the neutral-supported cable type NS75 arranged?
Two insulated aluminum conductors wrapped around a bare steel-reinforced aluminum conductor
What can the neutral of 10 AWG cable be?
Bare or insulated
What is the minimum depth requirement for burying the duct in an underground supply?
900 mm
What does bonding mean according to the CEC?
Joining non-current-carrying metal parts to form a path.
What is the minimum contact surface for a McGregor ground?
0.4 m
What is required when running a feeder from one building to another?
Grounded service conductor must have its potential re-established
What effect does corrosion have on electrodes?
Affects durability and life expectancy
Where must the McGregor ground be encased?
Bottom 50 mm of concrete foundation footing
What should be used for underground feeder conduits or cables?
Feeder’s bonding conductor
What is the minimum size of copper bonding conductor required for AWG copper feeder conductors according to CEC?
10 AWG copper
Considering an overhead service entrance, why is there a minimum clearance above grade necessary for the supply conductors?
To avoid accidental contact
What is the purpose of a service mast?
Support supply conductors
When must the mast be guyed?
When > 1.5 m above roof line
