Wire Stripping

Learning Objectives

At the end of the lesson, you will be able to:

  1. Cognitive Domain

  • Identify the types of wire and tools used in wire stripping

  1. Affective Domain

  • Practice proper procedure and guidelines in wire stripping

  1. Psychomotor Domain

  • Perform wire stripping on different types of wires

Let's Watch!

Let's Practice!

Activity 1.0


PERFORMANCE TASK ACTIVITY:

Wire Stripping Activity


A. Materials:

  • Wires (THHN 14 AWG)

  • Wire stripper/Combination plier/ long nose plier/knife


B. Activity Proper

  1. Base from the previous video demonstration, perform wire stripping using the prescribed materials and tools given.


  1. While performing the activity record yourself using a video recorder. Make sure that the video is clear and highlights you while performing the activity. Make the whole video short, 1 to 2 minutes should be enough.


  1. Open the given google form below and answer the given set of questions. Upload your video on the google form and click submit.

Let's Explore!

Have you ever experienced peeling a ripe banana, papaya, or paring a santol or ripe mango using a knife?

If yes, then wire stripping would be that easy for you, it has the same process, which is peeling-off the outer skin or insulator of wires

Wire stripping is referred to as he process of removing the outer protective insulation of a wire and preparing them for installation. The electrical wirings you see inside your television set and your house that provides electric current to the appliances, sockets and lights are stripped before being connected to each other.


Why do we strip wires?

As we already know, wires are electric conductors, which makes them more susceptible to accidents like accidental electrocution and damage to property when unprotected. Insulators serves as protective layer that protects the wire from heat, water, moisture and other natural elements, and provides protection against electrical hazards that could possibly occur especially when dealing with high voltage and high current electrical works. Removing this outer insulation to expose the conductor is the primary step in doing electrical wiring, installation and other related works.


Did You Know?

That in 1800’s the first insulator being used was the sap of Gutta Percha, a natural latex material produced from the sap of a tree of the same name.


Let's Read!

Electricity has greatly change our lives and how we see the world. It allows us to see in the dark, communicate over long distances, treat medical conditions and even send a man on the moon. However, this wouldn't be possible without the help of the conductors.

Conductors are substances or materials that are commonly made from highly conductive metals such as copper, silver, aluminum and iron that allows electric current to travel. Wires are excellent examples of conductors, they are being used in both house and industry.

Figure 1.0

Wires are categorized into two; stranded and solid wires. Stranded wires are wires that are made from multiple strands of conductive material such as copper that are twisted to form a wire. Solid wires, on the other hand, are wires that are made from a solid single strand of conductor, hence the name solid (Figure 1.0:).


These wires are widely used in electrical installation both inside and outside the building. Furthermore, wires are measured base on thier diameter or cross sectional area. AWG or American Wire Gauge is an American-based wire measuring system that was first introduce in North America and was later adopted in the whole world. It was first introduce in the Philippines long before the metric system was introduced.

The following discussion below will showcase the different types of wires, tools and guidelines used in wires stripping.


COMMONLY USED TYPES OF WIRE IN THE PHILIPPINES

Copper or Aluminum Bare Conductors

These are bare wires used for overhead transmission lines and for ground wires.

Thermoplastic Wires (type TW)

This is an ordinary wire use in an interior house wiring at circuit voltage up to 600 Volts. Suitable for the type of service where the conductor temperature does not exceed 60ËšC in dry or wet location.

Moisture Resistant Thermoplastic Wires (type THW)

These are use in an interior house wiring at circuit voltage up to 600 Volts. Suitable for the type of service where the conductor temperature does not exceed 75ËšC in dry or wet location

High Heat Resistant Thermoplastic Nylon coated wire (THHN) Moisture and Heat resistant Thermoplastic Nylon coated wire (THWN)

Wires are coded THHN/THWN-2 which is general purpose 600 Volts that can be used in power, lighting and control wiring. Suitable for the type of service where the conductor temperature does not exceed 90ËšC in dry location or wet location. THHN cannot be used in wet location.

Thermoplastic Fixture Wire (type TF)

This can be solid or stranded used for wiring lighting fixtures and as terminal wires.

Thermoplastic Fixture with Nylon Wire (type TFN)

This can be solid or stranded used for wiring lighting fixtures and as terminal wires. It is flame retardant and resistant to heat, gas and oil.

Non-metallic Sheathed Cable (type NM)

This has 2 or 3 conductors inside the cable used for exposed or concealed installation in buildings.

Flat Cord (type SPT)

This has two sets of stranded conductors separated by insulators. It is usually used for portable electrical equipment and for extension wiring of a single bulb.

Underground Feeder and Branch Circuit Cable (type UF)

This is a jacketed cable, used for direct burial wiring installation.

Intercom Cable

This shielded or unshielded cable has 3 conductors to 100 pairs, used for wiring interior communications, system and sound distribution jacketed.

Telephone Cable (type CCP)

This is installed aerial and duct type for telephone wiring with color coded conductor insulators.

Submersible Pump Cable

This is thermoplastic insulated cable used for wiring submersible pumps of deep well water systems.

Armored Cable (type ACT)(BX)

This has 2 or 3 conductors used for wiring installation in buildings.

Royal Cord

This has 2 to 4 conductors, stranded and used for portable cords in electrical equipment.

TYPES OF TOOLS USED IN WIRE STRIPPING

Tools used in wire stripping are categorized according to their functions. In wire stripping, there are two (2) process. Manual wire stripping and automatic wire stripping.

Manual Wire Stripping is a process of removing wire insulation using manually operated tools like manual wire strippers. They are specifically designed to be used for this specific work. Below are an example of manually operated tools commonly used in electricians in their field.

Manual Wire Stripper

Is the simplest wire stripping tool, ideal for lighter jobs which requires minimal force. It is referred to as a scissor-like tool, having two opposing blades with notches that correspond to the size or diameter of a wire.

Electrician’s Knife

Used by linemen to remove insulation of wire and cables in low and high voltage transmission line.

Combination Plier

Is used for gripping, holding and cutting electrical wire and even small nails.

Long Nose Plier

Used for cutting and holding fine wires. This can reach tight space or small opening where other pliers cannot reach and also used in making terminal loops of copper wires.

Side Cutter

A type of plier being used for cutting fine, medium and big wires and cables.

Tools used in wire stripping are categorized according to their functions. In wire stripping, there are two (2) process. Manual wire stripping and automatic wire stripping.

Automatic Wire Stripping is a much more advance version of manual wire stripping, it includes the use of semi-automatically operated wire stripper that instantly and easily remove insulation from the wire. The following tools listed below are examples of automatic wire stripper.

Automatic Wire Stripper

Is a hand held device that has two mechanisms which operate simultaneously whenever the handle is pressed. It has synchronized jaws which allow users to easily cut through and strip away wire sheathing with a single squeeze of the handle. This type of tool is practically useful especially when stripping a handful of wires and is much more time efficient than the manual wire stripping.

Self-adjusting automatic wire stripper

Is also called self-stripping tool, and self-adjusting wire strippers, that removes wire insulation with a compound action. This means that three actions take place when you squeeze the handle: grip, strip, and remove.

7 Guidelines in doing Wire Stripping

  1. Make sure all the stripping blades are sharp and free from nicks, dents or any damage.

  2. When using any type of wire stripper, hold the wire perpendicular to the cutting blades.

  3. Make sure that the insulation is clean cut with no frayed or ragged edges: trim if necessary.

  4. Make sure that insulation is removed from the stripped areas. Some types of wires are supplied with a transparent layer between the conductor and the primary insulation. If this is present, remove it.

  5. Thin wires are vulnerable to damage during the stripping process, so be careful and use the suitable adjustments to prevent damage.

  6. Electrical wires are potentially dangerous, so ensure that they are not live before undertaking any work on them.

  7. If the previous scenario cant be avoided, then follow standard electrical safety procedures in doing work, especially when dealing with large amount of energy.

Let's Have a Quiz!

Lets Quiz

Direction: Match the given keyword to its appropriate definition by dragging the keyword on the spot provided. You can only answer the quiz once, so please, make sure you to do your best.

Let's Do It!

Activity 1.0


Engagement Activity


1. Using the knowledge that you have learned in this lesson, perform wire stripping on different types of wire. You can choose at least 5 types of wires you can work by using any tools available in your shop or in your school electrical shop.

2. Write a narrative report about this activity by answering the following questions:

A. What type of wire did you choose?

B. What tool did you use in doing this activity?

C. What are the problems or challenges you have encountered? How did you resolve them?

D. Are the process of stripping wires the same in each wire? Why?


3. At the end of your narrative report, attach some photographs of yourself while performing this activity. Submit your output on the given google form below.

Let's Enhance!

Video Enhancement

Reading Enhancement

References

Image Sources


Lesson Shortcuts:

THAT'S ALL THANK YOU! AND SEE YOU FOR THE OTHER LESSONS!