Class 12 Power Chapter 3 Safety Precautions for Electrical Work Solutions English Medium As Per AHSEC New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters Class 12 Power Chapter 3 Safety Precautions for Electrical Work Question Answer and select need one. Class 12 Power Chapter 3 Safety Precautions for Electrical Work Notes Download PDF. AHSEC Class 12 Elective Electrical Power System Question Answer English Medium.
Class 12 Power Chapter 3 Safety Precautions for Electrical Work
Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. AHSEC Class 12 Elective Electrical Power System Textual Solutions are part of All Subject Solutions. Here we have given AHSEC Class 12 Electrical Power System Textbook Solutions English Medium for All Chapters, You can practice these here.
Safety Precautions for Electrical Work
Chapter: 3
| SESSION 1: SAFE WORKING PRACTICES |
| Exercise |
1. Write any 5 work performed by a lineman?
Ans: According to the passage under “Work Area Responsibilities” (Page 123–124), a lineman performs the following works:
(i) Erects and maintains overhead electric power lines to conduct electricity from the power plant to the place of use.
(ii) Climbs poles and towers, fixes insulators, lightning arresters, cross-braces, and other auxiliary equipment at proper heights.
(iii) Joins cables by various methods, fixes joint-boxes, replaces fuses, and tests for electrical continuity.
(iv) Maintains and repairs defective electricity lines, poles, towers, and auxiliary equipment as per given instructions.
(v) Works on high-tension (H.T.) or low-tension (L.T.) power lines to ensure proper flow of electricity.
2. Write a short note on discharge road.
Ans: A Discharge Rod is an insulated rod (with an extension rod) that has a resistance or corona capsule at its edge connected with an earthing lead. It is used to discharge the static or induction charge from the power line after opening it.
It is an important safety tool that prevents unforeseen dangers or fatal accidents.
Key points:
(i) The line should be treated as charged until properly discharged.
(ii) It safeguards against back-feeding cases, such as accidental generator supply or operator errors.
(iii) The rod should be kept dry, tested for continuity, and cleaned regularly.
(iv) While working, it should be connected to earth first and used with hand gloves to discharge each phase safely.
3. Write any 5 personnel protective equipment?
Ans: The following PPE are mentioned:
(i) Neon (Power) Tester – detects live H.V. and L.V. lines.
(ii) Discharge Rod – used to discharge the line before working.
(iii) Rubber Mat – placed in front of panels for insulation while operating switches.
(iv) Safety Gloves and Helmet – protect from electrocution and head injury.
(v) Rubber base PVC Sole Shoes / Safety Boots – protect from electric shock and ensure insulation.
4. Fill in the blanks:
(a) Lineman should follow __________ for measures related to safety and electric supply.
Ans: CEA Regulations 2010.
(b) __________ is used for earthing the line.
Ans: Discharge Rod.
(c) __________ should be taken before starting the work online.
Ans: Line clear permit.
(d) _________ protective instrument that gives alarm indication of live H.V. and L.V. lines.
Ans: Neon (Power) Tester.
| SESSION 2: BASIC FIRST AID PROCEDURES |
| Exercise |
1. Write down notes on basic first aid?
Ans: First aid is of prime importance in the event of an accident. Everyone should know the basic methods of giving first aid:
(i) Bring the affected person to a peaceful and airy place and ensure he is not suffocated.
(ii) Keep the body straight and lay the person on an even surface.
(iii) In case of a head injury, the head should be kept in an upward position.
(iv) If the person has trouble breathing, keep him in a sitting position.
(v) In epileptic conditions, the head should be kept below the level of the body.
(vi) For wounds, use iodine mixed water to clean and disinfect, apply iodine on the wound, and wrap it with medicated cotton.
(vii) A first aid box should always contain essential items such as cotton pads, iodine, antiseptic, adhesive plaster, spirit, Dettol, bandages, scissors, and safety pins.
2. What is Silverester’s System?
Ans: In Silverester’s System of artificial respiration:
(i) Lay down the electrocuted person in an upward position and loosen the clothes on the chest and stomach.
(ii) Place a pillow under the shoulders so that the neck and head are slightly downward.
(iii) Pull the tongue outward and sit near the person on your knees.
(iv) Hold the arms below the elbows, pull them parallel to the ground for about 3 seconds, then bring them down and press the chest for 2 seconds.
(v) Repeat this procedure 10 to 12 times per minute until the person starts breathing normally.
This system is effective because the head remains slightly upward, allowing immediate breathing response.
3. What precaution to be taken during mouth to Nose Respiration?
Ans: During Mouth to Nose Respiration, the following precautions should be taken:
(i) Ensure the airway is clear; if the throat is blocked by any object, remove it with fingers.
(ii) If the person’s teeth are tightly closed, prefer the nose-to-mouth method instead of forcing the mouth open.
(iii) Keep a thin handkerchief on the mouth if possible for hygiene.
(iv) For infants or young children, blow air slowly and gently (around 20 times per minute).
(v) Always ensure safety first — if performing on a pole, use safety belt and avoid any live electrical contact.
4. What is Artificial Respiration?
Ans: Artificial respiration (also known as Cardiopulmonary Resuscitation – CPR) is a life-saving process given when a person’s natural breathing stops, especially due to electrocution or suffocation.
It involves manually supplying air to the lungs to restore breathing and maintain oxygen flow.
The common methods include:
(i) Mouth to Mouth – exhaling air into the person’s mouth.
(ii) Mouth to Nose – exhaling air into the nose if the mouth cannot be opened.
(iii) Holger-Nelson System – pressing and releasing the back to move lungs.
(iv) Sheffer System – alternate pressure and release on the back to simulate breathing.
(v) Silverester’s System – pulling and pressing the arms and chest to maintain respiration.
Artificial respiration must be continued until the person starts breathing normally or medical help arrives.
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