Lesson page
Lesson 7: Tools and Materials
Read the lesson, then answer the multiple-choice practice set below. You get instant right or wrong feedback with explanation.
Tools and Materials Wiring Methods
Lesson Content
This lesson is practical vocabulary plus identification. If you can recognize the tool or material, many written questions become much easier.
Japanese Key Term
リングスリーブ（りんぐすりーぶ / ring sleeve）
Hiragana
りんぐすりーぶ
English Meaning
Ring sleeve
Simple Explanation
The exam expects you to know common tools and materials by shape, purpose, and Japanese name.
Detailed Explanation
Many questions show a tool or material and ask for its purpose. You should be able to identify VVF cable, push-in connectors, outlet boxes, circuit breakers, ELCB, MCCB, grounding wire, conduit, insulation testers, voltage testers, and crimping tools.
Key Vocabulary
- VVFケーブル（ぶいぶいえふけーぶる / VVF cable）
- リングスリーブ（りんぐすりーぶ / ring sleeve）
- 差込形コネクタ（さしこみがたこねくた / push-in connector）
- アウトレットボックス（あうとれっとぼっくす / outlet box）
Formula
Tool selection is based on the work method, conductor size, and connection type.
Worked Example
If two conductors must be crimped permanently, a ring sleeve may be used. If a quick connection is needed, a push-in connector may be more appropriate.
Exam Tips
Read the purpose of the tool, not only the name. Many answer choices look similar.
Common Exam Trap
Do not mix up breaker types, connector types, and box types just because they are all used in wiring.
Site Reality in Japan
On site, using the right material is part of both quality and safety. Written questions often ask which material fits the task.
Practice Question
Which item is commonly used to join conductors by crimping?
Answer
Ring sleeve
Explanation
A ring sleeve is used when conductors must be crimped together with the proper tool.
1. Primary purpose of the PE line here is:
PE ------------------------(Metal case) L,N -----------------------(Appliance)
PE is for protective earthing and fault-current safety, not normal operating current.
2. With SW1 open, the expected state is:
L --[SW1]--+--(Lamp A)--N
+--(Lamp B)--N
SW1 is upstream of both branch lamps, so opening it removes supply to both.
3. If the node above has no dot at crossing in exam notation, you should assume:
L ----(Node)----[SW]----(Lamp)
N ------------------------(Lamp)
Standard exam diagram logic treats crossings as non-connections unless explicit junction indication is given.
4. Most likely question theme for this hierarchy is:
DB -> Main breaker -> Branch breaker -> Lighting branch
Hierarchical protective chains are used to test protection role and branch isolation understanding.
5. A resistor is 20 ohms and the supply is 100 V. What current flows?
I = V / R = 100 / 20 = 5 A.
6. A load uses 600 W for 2 hours. How much energy is used?
0.6 kW x 2 h = 1.2 kWh.