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High Voltage Safety: Study Guide on Electrical Hazards and Prevention, Exams of Nursing

University of CambridgeNursing

This study guide focuses on high voltage safety, covering essential concepts and practices for electrical safety. It includes topics such as electric shock thresholds, effects of current on the human body, and safety measures like loto (lockout/tagout) procedures. The guide also addresses the use of insulated tools, ppe (personal protective equipment), and methods for minimizing arcing time. It further explores the computation of fault currents, arc-flash hazards, and the importance of grounding and bonding to ensure safety in high voltage environments. Useful for students and professionals in electrical engineering. (approximately 410 characters)

Typology: Exams

2024/2025

Available from 08/12/2025

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High Voltage Safety Study Guide
1. A person feels an electric shock when : - correct answer a
sufficient level of current passes through the body
2. The threshold of perception for feeling an electric current as an electric shock in
hand - to - hand contact is typically : - correct answer 1 mA
3. " Let - go current " is the value of current in a hand - to - hand contact situation
for which a person cannot release his / her grip . This value of current is typically
listed - correct answer 10 mA
4. The relationship between applied voltage and effective skin resistance is best
described as : - correct answer skin resistance is inversely
related to voltage
5. Ventricular fibrillation causes the heart to cease pumping blood because separate
heart muscles no longer operate in the proper sequence . This condition if untreated
, will result in : - correct answer certain death
6. The factor which does not influence the effective hand - to - hand resistance
during the time a person is receiving a shock is : - correct answer
internal body electrolyte temperature
7. The electric potential ( U ) developed during a fault between a person's feet while
taking a 30 " step is called : - correct answer Step potential
8. The electric potential ( U ) developed during a fault condition between a person's
hands & feet while in contact with a vertical structure is called : - correct answer
touch potential
9. The administrative and physical control of the access to electrical disconnects
fuses , circuit breakers , interlocks , switches , control systems , energy storage
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High Voltage Safety Study Guide

  1. A person feels an electric shock when : - correct answer a sufficient level of current passes through the body
  2. The threshold of perception for feeling an electric current as an electric shock in hand - to - hand contact is typically : - correct answer 1 mA
  3. " Let - go current " is the value of current in a hand - to - hand contact situation for which a person cannot release his / her grip. This value of current is typically listed - correct answer 10 mA
  4. The relationship between applied voltage and effective skin resistance is best described as : - correct answer skin resistance is inversely related to voltage
  5. Ventricular fibrillation causes the heart to cease pumping blood because separate heart muscles no longer operate in the proper sequence. This condition if untreated , will result in : - correct answer certain death
  6. The factor which does not influence the effective hand - to - hand resistance during the time a person is receiving a shock is : - correct answer internal body electrolyte temperature
  7. The electric potential ( U ) developed during a fault between a person's feet while taking a 30 " step is called : - correct answer Step potential
  8. The electric potential ( U ) developed during a fault condition between a person's hands & feet while in contact with a vertical structure is called : - correct answer touch potential
  9. The administrative and physical control of the access to electrical disconnects fuses , circuit breakers , interlocks , switches , control systems , energy storage

components , and other hazards has the abbreviation : - correct answer LOTO

  1. " V - rated " insulated hand tools ( wrenches , pliers , screwdrivers , etc ) are limited to voltage levels : - correct answer under 1000 Vac
  2. The registered international symbol used to identify " V rated " insulated tools and equipment for live - line use is : - correct answer an interlocked double " triangle "
  3. Removal of a LOTO tag should normally be done by : - correct answer only the person who applied the lock - out tag
  4. In addition to the stored electrical energy in capacitors , other sources of stored energy which must be considered when working on equipment are : - correct answer A. pneumatic B. thermal C. hydraulic D. mechanical E. all of the above
  5. All switching operations done on LV , MV , and HV systems are best done with deliberate and quick actions in order to : - correct answer minimize arcing time
  6. The total energy delivered to a fault can be measured using the units of : - correct answer watt - seconds
  7. The measurement used to quantify the radiant energy delivered per area during an arc - flash / arc - blast event is : - correct answer joules per square centimeter
  8. FR clothing has a ATPV ( Arc Thermal Performance Value ) rated in units of : - correct answer cal / square centimeter

B. technical documentation review C. test equipment checks and inspection of tools D. job rehearsal and a check of personnel qualifications E. all of the above

  1. Under what condition ( s ) is ( are ) it absolutely necessary to test the operation of a voltage - sensing instrument before and after the test is made : - correct answer voltage is expected and voltage is not measured
  2. Voltage sensors similar to the orange AEMC unit used during field exercises are :
  • correct answer sensitive to AC voltages and static electricity
  1. Grounding and bonding all current - carrying conductors and all metallic structures in a work - area ensures : - correct answer no electric potential exist between any conducting materials trip - unit setting may upset : or an electronic 31. Changing the type of fuse , fuse class , fuse value , circuit breaker rating or type - correct answer B. available fault current levels C. System coordination E. Both b and c.
  2. Which term is substantially equal to the term " live line " work : - correct answer " hot line " work
  3. Higher voltages are needed for higher power levels so : - correct answer current levels can be kept manageable
  4. An advantage of electric propulsion is : - correct answer compact size and redundancy
  5. The principle ( s ) of " circuit coordination " is ( are ) - correct answer A. defective equipment is isolated as soon as possible B. operational equipment remains connected C. discrimination is made based on current levels

D. discrimination is made based on time E. all of the above

  1. A three - phase wye - connected capacitor bank is installed in an 11.2 kV power system. Peak voltage applied to each capacitor is : - correct answer 9.1 kV
  2. A 20 uF capacitor is charged to a value of 7.9 kVdc. If the capacitor has a 5 Mohm bleeder resistor , the measured voltage after a period of 5 minutes is : - correct answer 400 volts
  3. The measurement which is not usually done in the field is : - correct answer Dielectric Permitivity Constant ( DPC )
  4. Electrical machines ( including generators , transformers , and motors ) generally have electrical ratings in units of : - correct answer KVA
  5. Computation of arc - flash hazards require knowledge of : - correct answer A. fault current B. system voltage C. clearing times D. working distance E. all of the information noted above is required
  6. When working with electric circuits , the key concept ( s ) employed to ensure protection against personal injury is ( are ) : - correct answer A. the voltage difference between contact points must be kept as low as possible B. the effective resistance which you present between contact points must be kept as high as possible C. both A and B are the key concepts employed
  7. The rating of protective gloves , from highest rated voltage to lowest rated voltage is CLASS : - correct answer 4,3,2,