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ELX > R2 LT1 > Flashcards

R2 LT1 Flashcards

1
Q

What switch design is largely preferred in bigger commercial and industrial installations where line voltage switches are used?

A

Toggle design

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2
Q

What does the term ‘grade’ refer to in switches?

A

Different levels of quality

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3
Q

What is the continuous current rating of most 20A switches?

A

16A

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4
Q

What does the R in R-2 refer to?

A

Receptacle

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5
Q

What are some variations of receptacles within the specification grade?

A

Commercial, construction, industrial, heavy-duty

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6
Q

How can you recognize isolated ground receptacles?

A

Green triangle on face

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7
Q

What is the key difference between a 15A and 20A receptacle?

A

Slot shape

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8
Q

What type of switch is most suitable for a 240V single-phase load where all live conductors are interrupted?

A

c. DPST

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9
Q

What are some variations within the specification grade of switches?

A

Commercial, construction, industrial, heavy-duty

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10
Q

How many terminals does a double-pole, double-throw (DPDT) switch have?

A

Six

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11
Q

What is the maximum voltage rating for L5-15R receptacles?

A

125V

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12
Q

What is the third grade of receptacles manufactured for?

A

To meet demanding requirements of hospital grade

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13
Q

What additional features may general-use switches include in their design?

A

Pilot lighting, dimmer function, motion-sensing capabilities

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14
Q

How many activation cycles are most certified electrical specification grade switches able to provide?

A

Thirty to fifty thousand

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15
Q

What does SPST stand for in switch terminology?

A

Single Pole Single Throw

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16
Q

What does a SPST switch’s actuator positions indicate?

A

ON or OFF

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17
Q

What is rotary activation?

A

Turning knob to activate mechanism

18
Q

Which certification bodies are commonly found on switches sold in Canada?

A

CSA Group, UL, ULC

19
Q

What does DPDT stand for?

A

Double Pole Double Throw

20
Q

What ratings do general-use switches have?

A

Voltage, ampacity, horsepower

21
Q

How are switches classified?

A

By their number of poles and throws

22
Q

What is an SPST switch used for?

A

Simple on-off control of a single load

23
Q

What are some example styles of general-use switches?

A

Doorjamb-mounted, pull-chain, key-locking, push-button

24
Q

What is a DPDT switch equivalent to?

A

Two SPDT switches

25
Q

How do general-use toggle switches activate?

A

Move handle up or down

26
Q

What does the 15 in L5-15R refer to?

A

15A

27
Q

What are the two styles in which fifteen- and twenty-amp non-locking receptacles are manufactured?

A

Standard style and decorator style

28
Q

Why are specification grade devices more reliable?

A

Robust and longer service life

29
Q

How can the hospital grade receptacles be identified?

A

By a green dot on the face

30
Q

What is the purpose of isolated ground receptacles?

A

Supply sensitive electronic equipment

31
Q

What is the shape of the slot for the identified conductor on a 15A receptacle?

A

Vertical

32
Q

What is the shape of the slot for the identified conductor on a 20A receptacle?

A

T-slot

33
Q

What is a key consideration with switches that have additional features like pilot lighting, dimmer function, and motion-sensing capabilities?

A

That the conductor is identified at the switch location

34
Q

Where are residential grade switches generally used?

A

Residential installations

35
Q

What CEC rule limits circuit loading to 80% of the rating of the overcurrent device?

A

CEC rule 8-104

36
Q

Describe the activation method for Decora style switches.

A

Acts like a see-saw

37
Q

Why do switch manufacturers limit the use of their devices to 80% of the marked ampacity?

A

Because the majority of circuit protection devices are not marked for continuous operation at their full ampacity.

38
Q

What are some other activation methods for switches mentioned in the text?

A

Pull-chain, key, doorjamb

39
Q

What must electrical equipment bear to show it has met safety standards in Canada?

A

Evidence of Approval

40
Q

Why is it important to verify the electrical ratings of switches?

A

Ensure safe use within intended circuit

41
Q

Why are switches intended to be installed within an enclosure?

A

Kept dry and free of dust

42
Q

What does ‘throw’ mean in switch terminology?

A

The number of positions of the switch actuator

ELX (55 decks)

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