D2 LT4 CEC Section 76 Temporary Wiring Flashcards
What is the minimum length of a tap conductor?
450 mm
Is it necessary to install grounding systems for temporary wiring?
Yes.
What should electricians working on construction sites be aware of?
Receptacles for portable power tools must be protected by GFCIs.
What is the maximum length of a tap conductor?
2 m
What will grounding and bonding protect against?
Shock hazards
What diameter must the circle have if access to the outlet box is through the recessed luminaire?
15 cm
Why is grounding and bonding important for overcurrent devices?
Allows them to do their job
What does Section 76 of the code provide rules for?
Temporary electrical installations
What size ground wire connects the two ground rods to the main fusible disconnect?
6 AWG copper
Where is service equipment typically installed?
Within a structure or weatherproof enclosure
What is the maximum distance between the outlet box and the fixture?
350 mm
What is the purpose of temporary service equipment in construction sites?
Supply power for power tools
What is the minimum distance between the outlet box and the fixture?
300 mm
What is the maximum service capacity when mounted to a single pole?
200-A
What must be provided if the fixture opening is smaller than 150 mm for accessing the junction box?
separate rectangular access hatch
Why should lighting circuits not be connected to power circuits?
Workers may be left in the dark if a power tool causes a circuit trip
What are some examples of what temporary electrical installations in Section 76 provide power for?
Lighting, power, tools, heating
Where can electricians find regulations regarding receptacles for portable power tools?
Review Section 76 of the CEC.
Why are many general requirements of the Code relaxed for temporary electrical installations?
Impractical to apply usual wiring methods
Which tables are helpful when selecting portable power cables and flexible cords?
Table 19 and Table 11.
What is Figure 57 in the text used for?
Illustration of a temporary service
What is required for installing overhead conductors or cables when equipment and operations on the ground make it necessary?
Suitable supports spaced at intervals.
What are the minimum and maximum span lengths for single conductor sizes listed in the rules?
4.5 m to 15 m, 15 m to 30 m, 30 m to 40 m.
What is the maximum value for dimension ‘A’ in Subrule (4)?
350 mm
What is the maximum span for neutral supported cables according to Rule 12-318(c)?
38 m.
Where can more information about these requirements be found?
Review Section 30 of the Code
What type of circuit interrupters should protect receptacles in construction projects?
Class A ground fault circuit interrupters
What must the wiring construction for temporary installations be?
Portable, flexible, easy to modify
What type of portable power cables and flexible cords must be used for temporary wiring in construction?
Extra-hard-usage outdoor type.
