In a wiring diagram, one section is drawn with a single line. Which statement about this line is correct?
The section always has exactly one conductor
The section always has exactly two conductors
It shows the route of the wiring with one line, regardless of the number of conductors
The section must use solid single wires instead of cables
AnswerC. It shows the route of the wiring with one line, regardless of the number of conductors
Wiring diagrams normally show the route of the wiring with one line, whatever the number of conductors (single-line diagram, 単線図). So one line can stand for 2, 3, 4 or more conductors; "always one" and "always two" are wrong. A "solid wire" (単線) is a wire with a single solid conductor, which is a different meaning of the word.
Q2 | Colour of the grounded conductor
In the example construction conditions of the practical exam, what colour of insulation is used for the grounded conductor from the supply?
White
Black
Red
Green
AnswerA. White
The construction conditions say that white is used for all grounded conductors (接地側電線) from the supply. Black is for the ungrounded conductor from the supply to switches, outlets and so on. Red appears, for example, as the third core of a 3-core cable and is not the colour specified for the grounded side. Green is used for earthing wires, which are different from the grounded conductor.
Q3 | Colour of the ungrounded conductor
In the example construction conditions, what colour is used for the ungrounded conductor from the supply to a switch?
White
Red
Black
Green
AnswerC. Black
The construction conditions say black is used for all ungrounded conductors from the supply to switches (and to outlets and pilot lamps). White is the colour of the grounded conductor. Red may be used for a return wire, but it is not the colour specified for the ungrounded side. Green is the colour for earthing wires.
Q4 | Terminal for the white wire
When wiring a lamp receptacle, which terminal does the white wire go to?
The terminal for the centre contact
The terminal for the screw shell
Either terminal is fine
The terminal for the wire from the ungrounded side of the supply
AnswerB. The terminal for the screw shell
The construction conditions say the white wire goes to the terminal of the screw shell (受金ねじ部) of a lamp receptacle. The screw part where the bulb is turned in is easy to touch, so the grounded side, close to earth potential, is connected there. The centre contact takes the return wire or similar. It is not "either terminal", and the ungrounded (black) wire is not the one for the screw shell.
Q5 | The W pole of an outlet
Which wire goes to the pole (slot) of an outlet marked "W"?
The return wire
The ungrounded conductor (black)
The earthing wire (green)
The grounded conductor (white)
AnswerD. The grounded conductor (white)
The construction conditions say the white wire goes to the grounded-pole terminal of an outlet, marked W. "W" marks the grounded pole. Black goes to the other pole. An outlet is not switched, so no return wire goes to it. A green earthing wire goes to the earth terminal of an outlet with an earth pole, not to the W pole.
Q6 | Wires at a switch
In the multi-line diagram of a circuit where one light is switched by one single-pole switch, which two wires connect to the switch?
The grounded conductor (white) and the return wire
Two return wires
The grounded conductor (white) and the ungrounded conductor (black)
The ungrounded conductor (black) and the return wire
AnswerD. The ungrounded conductor (black) and the return wire
A switch opens and closes the path on the ungrounded side. The ungrounded (black) wire from the supply comes in, and the return wire goes out from the switch to the light. White does not go to the switch; it goes straight to the light. An outlet is what gets both white and black. Two return wires appear, for example, when two switches for two separate lights sit side by side.
Q7 | Return wire
Which is the correct description of a "return wire" (返り線)?
The wire from a switch to a light fixture
The grounded wire from the supply to a light fixture
The ungrounded wire from the supply to an outlet
The wire that connects the metal parts of a fixture to earth
AnswerA. The wire from a switch to a light fixture
A return wire is the wire that goes from a switch to the light fixture. The grounded wire from the supply to a light is the white grounded conductor; the ungrounded wire from the supply to an outlet is black. A wire connecting metal parts to earth is an earthing wire.
Q8 | Steps for a multi-line diagram
When drawing a multi-line diagram from a single-line diagram, where should the white (grounded) wire be drawn to?
All switches
All switches and outlets
Terminal 0 of a 3-way switch
All light fixtures and outlets
AnswerD. All light fixtures and outlets
White is drawn from the grounded side of the supply to every load: all light fixtures and all outlets. It is never run through a switch. Black (ungrounded) is what goes to switches and to terminal 0 on the supply side of a 3-way switch. Outlets get both white and black, but switches do not get white.
Q9 | Switching from two places
You want one light to be switched from two places, at the top and bottom of a staircase. Which switches are needed?
Two 3-way switches
Two single-pole switches
One 3-way switch and one 4-way switch
Two 4-way switches
AnswerA. Two 3-way switches
To switch from two places, use two 3-way switches and link terminal 1 to 1 and 3 to 3 with two wires. With two single-pole switches, in series the light is on only when both are on, and in parallel it is off only when both are off, so you cannot switch freely from each place. A 4-way switch goes between 3-way switches when there are three or more places; it is not used alone or as a pair.
Q10 | Switching from three places
Which combination of switches is used to switch one light from three places?
Three 3-way switches
One 3-way switch and two 4-way switches
Two 3-way switches and one 4-way switch
One single-pole switch and two 3-way switches
AnswerC. Two 3-way switches and one 4-way switch
For three places, put two 3-way switches at the ends and one 4-way switch between them. The 4-way switch changes the two traveller wires between "straight" and "crossed". With three 3-way switches, the middle one cannot swap the two travellers. One 3-way plus two 4-way switches does not give the two ends the circuit needs. If a single-pole switch is mixed in, turning it off at that place stops the other places from turning the light on.
Q11 | Terminal 0 of a 3-way switch
In a circuit with two 3-way switches (common type with terminals 0, 1 and 3), which wires go to the 0 terminals?
Black (supply) to one 0 terminal, the return wire to the other 0 terminal
Black (supply) to both 0 terminals
White (grounded) to one 0 terminal, black to the other
Return wires to both 0 terminals
AnswerA. Black (supply) to one 0 terminal, the return wire to the other 0 terminal
Terminal 0 is the common terminal. The supply black goes to 0 of one 3-way switch, and the return wire to the light leaves from 0 of the other. Terminals 1-1 and 3-3 are linked by the travellers. With black on both, there is no path to the light. White never goes through a switch. With return wires on both, the supply black never enters.
Q12 | Always-on pilot lamp
How is a pilot lamp (確認表示灯) connected so that it is "always on" (常時点灯)?
In parallel with the switch
In parallel with the light (between the return wire and white)
In series with the switch
Between the supply black and white
AnswerD. Between the supply black and white
An always-on lamp is lit whatever the switch position, so it is connected directly between the ungrounded (black) and grounded (white) sides of the supply. In parallel with the light, it goes on and off with the light (simultaneous, 同時点滅). In parallel with the switch, it is lit only when the switch is off (alternate, 異時点滅). In series with the switch, the light current would flow through the lamp, which is not a correct circuit.
Q13 | Simultaneous pilot lamp
How is a pilot lamp connected so that it goes on and off together with the light (同時点滅)?
In parallel with the light (between the return wire and white)
In parallel with the switch
Between the supply black and white
In series with the light
AnswerA. In parallel with the light (between the return wire and white)
Connected across the same two points as the light (the return wire and white), it gets the same voltage as the light when the switch is on, so both go on and off together. In parallel with the switch is alternate (異時点滅); between black and white is always-on (常時点灯). In series with the light, neither gets the correct voltage and the light does not work properly.
Q14 | Alternate pilot lamp
A pilot lamp is connected in parallel with a switch. How does it light?
It is always on
It goes on and off together with the light
It lights when the switch is off and the light is off
It is always off
AnswerC. It lights when the switch is off and the light is off
In parallel with the switch gives "alternate" operation (異時点滅). When the switch is off, there is voltage across the pilot lamp, so it lights; when the switch is on, its two ends are joined at the same potential, so it goes out. It lights at the opposite time to the light. Always-on is between black and white; simultaneous is in parallel with the light. It is not always off.
Q15 | Connections in a joint box
In the practical exam construction conditions, how are wires passing through a VVF joint box to be handled?
Connection points are made for all of them in that box
Passed through the box without connections
Only white is connected; black passes through
Connections are made only inside switch boxes
AnswerA. Connection points are made for all of them in that box
The construction conditions say that all wires passing through a VVF joint box (VVF用ジョイントボックス) must have their connection points in that box, and they also specify the method (ring sleeve or push-in connector). So in a multi-line diagram you count the connection points in each joint box and decide the method for each. Passing through, connecting only white, or connecting only in switch boxes all differ from the conditions.
Q16 | One light, one switch
Figure: Single-line diagram: supply, joint box, light a, switch a. Section 1 is between the JB and switch a. What is the minimum number of conductors in the section marked 1 in the figure? Assume all connections are made inside joint boxes. (How to read the figure: ○ is a light fixture, ● is a switch [3 = 3-way switch, 4 = 4-way switch], PL is a pilot lamp, □ is a joint box [JB], and a dashed frame means the devices are mounted in the same switch box. The supply is single-phase two-wire 100 V.)
5
4
3
2
AnswerD. 2
Beyond this section there is only switch a. A switch needs black (ungrounded supply) and the return wire; white does not go to switches. So 1 (black) + 1 (return) = 2. Thinking 3 comes from wrongly sending white to the switch as well.
Q17 | Two switches in one box
Figure: Lights a and b; switches a and b in the same box. Section 1 is between the JB and the switch box. What is the minimum number of conductors in the section marked 1 in the figure? Assume all connections are made inside joint boxes. (How to read the figure: ○ is a light fixture, ● is a switch [3 = 3-way switch, 4 = 4-way switch], PL is a pilot lamp, □ is a joint box [JB], and a dashed frame means the devices are mounted in the same switch box. The supply is single-phase two-wire 100 V.)
2
3
4
5
AnswerB. 3
The box holds switch a and switch b. One black is shared by both switches; there are two return wires, a→light a and b→light b. White does not go to switches. 1 + 2 = 3. Four comes from counting a black for each switch; two comes from merging the return wires.
Q18 | Switch and outlet
Figure: Light a; switch a and an outlet in the same box. Section 1 is between the JB and that box. What is the minimum number of conductors in the section marked 1 in the figure? Assume all connections are made inside joint boxes. (How to read the figure: ○ is a light fixture, ● is a switch [3 = 3-way switch, 4 = 4-way switch], PL is a pilot lamp, □ is a joint box [JB], and a dashed frame means the devices are mounted in the same switch box. The supply is single-phase two-wire 100 V.)
2
3
4
5
AnswerB. 3
The box holds switch a and an outlet. The switch needs black and the return wire; the outlet needs black and white. Black can be shared, so 1 black + 1 return + 1 white = 3. Two forgets the outlet's white; four counts black twice.
Q19 | Two switches and an outlet
Figure: Lights a and b; switch a, switch b and an outlet in the same box. Section 1 is between the JB and that box. What is the minimum number of conductors in the section marked 1 in the figure? Assume all connections are made inside joint boxes. (How to read the figure: ○ is a light fixture, ● is a switch [3 = 3-way switch, 4 = 4-way switch], PL is a pilot lamp, □ is a joint box [JB], and a dashed frame means the devices are mounted in the same switch box. The supply is single-phase two-wire 100 V.)
2
3
4
5
AnswerC. 4
The box holds switch a, switch b and an outlet. One black is shared by all three, there are two return wires (for a and b), and one white for the outlet. 1 + 2 + 1 = 4. Three forgets the white; five counts an extra black for the outlet.
Q20 | 3-way switch via JB
Figure: Light a is switched from two places by 3-way switches; both connect to the JB. Section 1 is between the JB and the left 3-way switch. What is the minimum number of conductors in the section marked 1 in the figure? Assume all connections are made inside joint boxes. (How to read the figure: ○ is a light fixture, ● is a switch [3 = 3-way switch, 4 = 4-way switch], PL is a pilot lamp, □ is a joint box [JB], and a dashed frame means the devices are mounted in the same switch box. The supply is single-phase two-wire 100 V.)
2
3
4
5
AnswerB. 3
Both 3-way switches connect to the joint box. The section to the left 3-way switch carries the wire for terminal 0 (supply black, or the return to the light) plus the two travellers (terminals 1 and 3) that go on to the other 3-way switch. 1 + 2 = 3. Two treats the travellers as one wire; four counts both black and the return.
Q21 | 4-way switch via JB
Figure: Light a is switched from three places by a 3-way, a 4-way and a 3-way switch, each connected to the JB. Section 1 is between the JB and the 4-way switch. What is the minimum number of conductors in the section marked 1 in the figure? Assume all connections are made inside joint boxes. (How to read the figure: ○ is a light fixture, ● is a switch [3 = 3-way switch, 4 = 4-way switch], PL is a pilot lamp, □ is a joint box [JB], and a dashed frame means the devices are mounted in the same switch box. The supply is single-phase two-wire 100 V.)
2
3
4
5
AnswerC. 4
A 4-way switch takes two travellers from each 3-way switch and swaps them. Via a joint box, the two travellers from the left and the two from the right all run in this section, so 4. Black and the return go to terminal 0 of the 3-way switches, not through the 4-way section. Three confuses it with a 3-way switch section.
Q22 | Section between two JBs
Figure: An outlet and switch a connect to JB1; light a, light b and switch b connect to JB2. Section 1 is between JB1 and JB2. What is the minimum number of conductors in the section marked 1 in the figure? Assume all connections are made inside joint boxes. (How to read the figure: ○ is a light fixture, ● is a switch [3 = 3-way switch, 4 = 4-way switch], PL is a pilot lamp, □ is a joint box [JB], and a dashed frame means the devices are mounted in the same switch box. The supply is single-phase two-wire 100 V.)
2
3
4
5
AnswerB. 3
Beyond JB2 are light a, light b and switch b. The section carries white for lights a and b (one shared), the return from switch a (on the JB1 side) to light a, and black for switch b: 3 wires. The return from switch b to light b stays inside JB2. The outlet is on the JB1 side, so it does not affect this section.
Q23 | Pilot lamp, alternate
Figure: Light a; switch a and a pilot lamp in the same box. Section 1 is between the JB and that box. What is the minimum number of conductors in the section marked 1? The pilot lamp is alternate (異時点滅), and all connections are made inside joint boxes. (How to read the figure: ○ is a light fixture, ● is a switch [3 = 3-way switch, 4 = 4-way switch], PL is a pilot lamp, □ is a joint box [JB], and a dashed frame means the devices are mounted in the same switch box. The supply is single-phase two-wire 100 V.)
2
3
4
5
AnswerA. 2
An alternate pilot lamp is in parallel with the switch, so it connects across the switch terminals (black and the return). No white is needed: 1 black + 1 return = 2. With an always-on or simultaneous lamp, white is added and it becomes 3.
Q24 | Pilot lamp, always on
Figure: Light a; switch a and a pilot lamp in the same box. Section 1 is between the JB and that box. What is the minimum number of conductors in the section marked 1? The pilot lamp is always on (常時点灯), and all connections are made inside joint boxes. (How to read the figure: ○ is a light fixture, ● is a switch [3 = 3-way switch, 4 = 4-way switch], PL is a pilot lamp, □ is a joint box [JB], and a dashed frame means the devices are mounted in the same switch box. The supply is single-phase two-wire 100 V.)
2
3
4
5
AnswerB. 3
An always-on pilot lamp connects between black and white, so white must reach the switch box. Black (shared by switch and lamp) 1 + return 1 + white 1 = 3. Two is the count for an alternate lamp; four counts black twice.
Q25 | 3-way switches wired directly
Figure: Light a is switched by two 3-way switches. Only the left 3-way switch connects to the JB; the right one connects directly to the left one. Section 1 is between the two 3-way switches. What is the minimum number of conductors in the section marked 1 in the figure? (How to read the figure: ○ is a light fixture, ● is a switch [3 = 3-way switch, 4 = 4-way switch], PL is a pilot lamp, □ is a joint box [JB], and a dashed frame means the devices are mounted in the same switch box. The supply is single-phase two-wire 100 V.)
2
3
4
5
AnswerB. 3
The right 3-way switch is wired directly to the left one. Besides the two travellers linking terminals 1 and 3, one more wire runs here to terminal 0 of the right switch (the supply black or the return to the light). 2 + 1 = 3. Two forgets the wire to terminal 0.
Q26 | JB with only a light beyond it
Figure: Switch a connects to JB1; light a connects to JB2. Section 1 is between JB1 and JB2. What is the minimum number of conductors in the section marked 1 in the figure? Assume all connections are made inside joint boxes. (How to read the figure: ○ is a light fixture, ● is a switch [3 = 3-way switch, 4 = 4-way switch], PL is a pilot lamp, □ is a joint box [JB], and a dashed frame means the devices are mounted in the same switch box. The supply is single-phase two-wire 100 V.)
5
4
3
2
AnswerD. 2
Beyond JB2 there is only light a. A light needs white and the return wire, so 2. Switch a is on the JB1 side, so black does not need to go to JB2. Three wrongly sends black as well.
Q27 | Two lights switched together
Figure: Two lights a are switched together by one switch a. Section 1 is between the JB and switch a. What is the minimum number of conductors in the section marked 1 in the figure? Assume all connections are made inside joint boxes. (How to read the figure: ○ is a light fixture, ● is a switch [3 = 3-way switch, 4 = 4-way switch], PL is a pilot lamp, □ is a joint box [JB], and a dashed frame means the devices are mounted in the same switch box. The supply is single-phase two-wire 100 V.)
2
3
4
5
AnswerA. 2
Both lights a are switched together by switch a, so the lights are connected in parallel and one return wire is enough. The switch section is 1 black + 1 return = 2. Three comes from counting a return for each light.
Q28 | Number of cores
The minimum number of conductors in a section is found to be 3. Which VVF cable (flat PVC-sheathed cable) is suitable?
2-core
4-core
3-core
Three 2-core cables
AnswerC. 3-core
A section needing 3 conductors uses a 3-core cable. A 2-core cable is one short, a 4-core cable has one extra, and three 2-core cables give six conductors, which does not match the idea of the minimum number.
Q29 | White never goes to a switch
When counting the section from a joint box to a switch box containing only switches, which approach is correct?
White does not go to switches, so count only black and the return wires
White and black always run, so it is at least 3
Count one black for each switch
Count a return for each light, even lights on the same switch
AnswerA. White does not go to switches, so count only black and the return wires
A switch sits in the ungrounded (black) line, and white never goes to it. For a box with only switches, count black (one, shared) and the return wires (one per switch). It is not true that white and black always run. One black is shared however many switches there are. Lights on the same switch are in parallel, so one return is enough.
Q30 | Why a 4-way section has 4
In a three-place switching circuit, why does the section from the joint box to the 4-way switch have 4 conductors?
Because black, white and two returns run there
Because two blacks and two returns run there
Because there are four light fixtures
Because two travellers from each of the 3-way switches run there
AnswerD. Because two travellers from each of the 3-way switches run there
A 4-way switch swaps the two travellers from one 3-way switch with the two going to the other 3-way switch. Via a joint box, all four run in this section. Black and the return go to terminal 0 of the 3-way switches, and white never goes to switches. It has nothing to do with the number of lights.
Q31 | 1.6 mm × 2
At one connection point, two 1.6 mm wires are joined with a ring sleeve (E type) by crimping. Which sleeve size and crimp mark are correct?
Small sleeve, mark ○
Small sleeve, mark "small" (小)
Medium sleeve, mark "medium" (中)
Large sleeve, mark "large" (大)
AnswerA. Small sleeve, mark ○
Two 1.6 mm wires use a small sleeve with the ○ mark. The same small sleeve takes the "small" (小) mark for three or four 1.6 mm wires and similar cases. Medium and large are for more wires.
Q32 | 1.6 mm × 3
At one connection point, three 1.6 mm wires are joined with a ring sleeve (E type) by crimping. Which sleeve size and crimp mark are correct?
Small sleeve, mark ○
Small sleeve, mark "small" (小)
Medium sleeve, mark "medium" (中)
Large sleeve, mark "large" (大)
AnswerB. Small sleeve, mark "small" (小)
Three or four 1.6 mm wires use a small sleeve with the "small" mark. The ○ mark is for two 1.6 mm wires. Medium is for five or six 1.6 mm wires and large for seven.
Q33 | 1.6 mm × 5
At one connection point, five 1.6 mm wires are joined with a ring sleeve (E type) by crimping. Which sleeve size and crimp mark are correct?
Small sleeve, mark ○
Small sleeve, mark "small" (小)
Medium sleeve, mark "medium" (中)
Large sleeve, mark "large" (大)
AnswerC. Medium sleeve, mark "medium" (中)
Five or six 1.6 mm wires use a medium sleeve with the "medium" mark. A small sleeve takes up to four, and large is for seven. The ○ mark is for two 1.6 mm wires.
Q34 | 2.0 mm × 2
At one connection point, two 2.0 mm wires are joined with a ring sleeve (E type) by crimping. Which sleeve size and crimp mark are correct?
Small sleeve, mark ○
Small sleeve, mark "small" (小)
Medium sleeve, mark "medium" (中)
Large sleeve, mark "large" (大)
AnswerB. Small sleeve, mark "small" (小)
Two 2.0 mm wires use a small sleeve with the "small" mark. It is easy to confuse this with the ○ mark used for two 1.6 mm wires. Three or four 2.0 mm wires use medium, five use large.
Q35 | 2.0 mm × 1 + 1.6 mm × 2
At one connection point, one 2.0 mm wire and two 1.6 mm wires are joined with a ring sleeve (E type) by crimping. Which sleeve size and crimp mark are correct?
Small sleeve, mark ○
Small sleeve, mark "small" (小)
Medium sleeve, mark "medium" (中)
Large sleeve, mark "large" (大)
AnswerB. Small sleeve, mark "small" (小)
One 2.0 mm wire with one or two 1.6 mm wires uses a small sleeve with the "small" mark. With three to five 1.6 mm wires it becomes medium. The ○ mark is for two 1.6 mm wires.
Q36 | 2.0 mm × 1 + 1.6 mm × 3
At one connection point, one 2.0 mm wire and three 1.6 mm wires are joined with a ring sleeve (E type) by crimping. Which sleeve size and crimp mark are correct?
Small sleeve, mark ○
Small sleeve, mark "small" (小)
Medium sleeve, mark "medium" (中)
Large sleeve, mark "large" (大)
AnswerC. Medium sleeve, mark "medium" (中)
One 2.0 mm wire with three to five 1.6 mm wires uses a medium sleeve with the "medium" mark. With only one or two 1.6 mm wires it is small (mark "small"). Large is for cases such as one 2.0 mm with six 1.6 mm wires.
Q37 | 1.6 mm × 7
At one connection point, seven 1.6 mm wires are joined with a ring sleeve (E type) by crimping. Which sleeve size and crimp mark are correct?
Small sleeve, mark ○
Small sleeve, mark "small" (小)
Medium sleeve, mark "medium" (中)
Large sleeve, mark "large" (大)
AnswerD. Large sleeve, mark "large" (大)
Seven 1.6 mm wires use a large sleeve with the "large" mark. A medium sleeve takes up to six 1.6 mm wires, and a small one up to four.
Q38 | 2.6 mm × 1 + 1.6 mm × 1
At one connection point, one 2.6 mm wire and one 1.6 mm wire are joined with a ring sleeve (E type) by crimping. Which sleeve size and crimp mark are correct?
Small sleeve, mark ○
Small sleeve, mark "small" (小)
Medium sleeve, mark "medium" (中)
Large sleeve, mark "large" (大)
AnswerC. Medium sleeve, mark "medium" (中)
No combination with a 2.6 mm wire is listed for the small sleeve. One 2.6 mm wire with one to three 1.6 mm wires uses a medium sleeve with the "medium" mark. Large is for cases such as three 2.6 mm wires.
Q39 | Crimping tool
Which tool is used for crimping ring sleeves?
A crimping tool for terminals with a red grip
A wire stripper
Lineman's pliers
A ring-sleeve crimping tool with a yellow grip
AnswerD. A ring-sleeve crimping tool with a yellow grip
Under JIS, a ring-sleeve crimping tool has a yellow grip. With this tool the crimp marks ○, small, medium and large are stamped. A crimping tool for terminals stamps numbers, which is treated as a defect. Pliers cut and bend wire, and a wire stripper removes insulation; neither is used for crimping.
Q40 | Crimp mark defects
Under the defect criteria for the practical exam, which is a defect in a ring sleeve (E type) crimped connection?
One sleeve has two or more crimp marks
Seen from above, the tips of all conductors are visible
The conductors stick out 2 mm from the top of the sleeve
One sleeve is used for one connection
AnswerA. One sleeve has two or more crimp marks
The defect criteria list as defects: two or more crimp marks on one ring sleeve, two or more sleeves for one connection, a partly missing crimp mark, and so on. Being able to see all conductor tips from above is correct (if even one cannot be seen, it is a defect). Conductors sticking out from the top are a defect from 5 mm, so 2 mm is not. One sleeve for one connection is the correct use.
Q41 | Over-stripping
Under the defect criteria, from how many millimetres of conductor exposed below the bottom of a ring sleeve (due to over-stripped insulation) is it a defect?
2 mm
5 mm
10 mm
20 mm
AnswerC. 10 mm
The criteria treat conductor exposed 10 mm or more below the bottom of a ring sleeve, due to over-stripping, as a defect. 5 mm is the limit for conductor sticking out from the top of the sleeve. 2 mm is the limit for exposure at a device's push-in hole, and 20 mm relates to other items, such as insulation left at 20 mm or less because the cable sheath was not stripped enough.
Q42 | Checking a push-in connector
For a connection with a push-in connector, which state is correct according to the defect criteria?
Conductor not visible from the side at the tip, and not visible at the bottom
Conductor visible from the side at the tip, and also visible at the bottom
Conductor not visible from the side at the tip, but visible at the bottom
Conductor visible from the side at the tip, and not visible at the bottom
AnswerD. Conductor visible from the side at the tip, and not visible at the bottom
The criteria treat as defects a conductor that cannot be seen from the side at the tip of the connector (not pushed in far enough) and a conductor that can be seen from the side at the bottom (over-stripped). The correct state is visible at the tip and not visible at the bottom. The other three are under-insertion, over-stripping, or both.
Q43 | Redoing a push-in connection
According to the examination centre's guide, how should a push-in connector connection be redone?
Pull the conductors out and reinsert them in the same connector
Wrap the whole connector with vinyl tape to reinforce it
Crimp a ring sleeve over the connector
Cut below the connector and reconnect with a new connector
AnswerD. Cut below the connector and reconnect with a new connector
The guide says to cut the wires below the connector and reconnect correctly with a new push-in connector, because pulling the conductors out can damage or break them. Crimping a sleeve over the connector or wrapping it with tape is not described.
Q44 | Number of sleeves
Figure: Lights a and b; switches a and b in the same box. Section 1 is between the JB and the switch box. A joint box connects the supply (1.6 mm) to light a, light b, and switches a and b in the same box (the circuit in the figure). If all connections in it are made with ring sleeves, what sleeves are used and how many at minimum? All wires are 1.6 mm. (How to read the figure: ○ is a light fixture, ● is a switch [3 = 3-way switch, 4 = 4-way switch], PL is a pilot lamp, □ is a joint box [JB], and a dashed frame means the devices are mounted in the same switch box. The supply is single-phase two-wire 100 V.)
3 small sleeves
4 small sleeves
3 small sleeves and 1 medium sleeve
5 small sleeves
AnswerB. 4 small sleeves
There are four connection points. White: supply, light a and light b, 3 wires (small, mark "small"). Black: supply and the black to the switches, 2 wires (small, mark ○). Return a: from switch a and to light a, 2 wires (small, ○). Return b: likewise 2 wires (small, ○). All are small sleeves, 4 in total. Three merges the returns; five counts a black for each switch. No point has five or more wires needing a medium sleeve.
Q45 | Breakdown of crimp marks
Figure: Lights a and b; switches a and b in the same box. Section 1 is between the JB and the switch box. In the same joint box as the previous question, only the supply cable is changed to 2.0 mm; all other wires are 1.6 mm. Which breakdown of crimp marks is correct? (How to read the figure: ○ is a light fixture, ● is a switch [3 = 3-way switch, 4 = 4-way switch], PL is a pilot lamp, □ is a joint box [JB], and a dashed frame means the devices are mounted in the same switch box. The supply is single-phase two-wire 100 V.)
3 × ○ and 1 × small
4 × ○
2 × ○ and 2 × small
1 × ○, 1 × medium and 2 × small
AnswerC. 2 × ○ and 2 × small
The white point is 2.0 mm × 1 + 1.6 mm × 2: small sleeve, mark "small". The black point is 2.0 mm × 1 + 1.6 mm × 1: small sleeve, mark "small". The two return points are 1.6 mm × 2 each: mark ○. So 2 × ○ and 2 × small. With a 1.6 mm supply it would be 3 × ○ and 1 × small, but a 2.0 mm wire changes the marks. No combination needs a medium sleeve.
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