13-EHS- Section 5 Flashcards
According to the Electrical Safety Hand Book, What is the purpose of padmount transformers and switching kiosks in an underground electrical installation?**
- A. To generate electricity
- B. To distribute electricity
- C. To store electricity
- D. To regulate electricity
B
Padmount transformers and switching kiosks are the above ground portion of an underground electrical installation. In an underground distribution system buried, insulated power lines carry the high and low voltage electricity. Underground power lines can supply primary (2,400 to 27,600 volts) and secondary (120/240 and 347/600 volt) electrical power
According to the Electrical Safety Hand Book, In an underground distribution system, what carries high and low voltage electricity?**
- A. Overhead power lines
- B. Insulated power lines
- C. Substations
- D. Switching kiosks
B
insulated power lines carry the high and low voltage electricity.
According to the Electrical Safety Hand Book, How deep are underground cables typically buried?**
- A. 1 meter
- B. 2 meters
- C. 3 meters
- D. 4 meters
A
Underground cables are normally buried at least one metre (3 t) below ground level; however, changes in topsoil cover could increase or decrease the depth below the surface.
Why is it impossible to predict the location of According to the Electrical Safety Hand Book, underground cables coming out from a padmount transformer or kiosk?**
- A. They are invisible
- B. They are always in a straight line
- C. They are detected by GPS
- D. The number can vary, and a detector is needed
D
There can be any number of cables coming out from a padmount transformer or kiosk and it is impossible to predict the location of these cables without using a detector.
According to the Electrical Safety Hand Book, What action should be taken if a padmount transformer or switching kiosk is damaged in a vehicle accident?**
- A. Wait for it to fix itself
- B. Assess the situation from at least 10 meters back
- C. Call the fire department
- D. Ignore the damage
B
Padmount transformer or switching kiosk is damaged in a vehicle accident.
1. Assess the situation from at least 10 metres (33 t) back.
2. Determine the safe zone, secure the area, inform other emergency responders and keep people away.
3. Call the local electrical utility giving the location.
4. Keep feet close together when approaching the vehicle.
5. Tell occupants of the vehicle to “Stay in the vehicle. We are contacting the electrical utility”.
6. Call the local electrical utility and provide the transformer or switching kiosk location and number. Numbers are stenciled on the unit usually in large yellow letering.
7. Wait for electrical utility personnel to isolate and de-energize the padmount transformer. Be patient, it may take some time
According to the Electrical Safety Hand Book, When a padmount transformer shows evidence of tampering, what is the first action an emergency responder should take?**
- A. Assess the situation from at least 10 meters back
- B. Call the local electrical utility
- C. Attempt to fix the tampering
- D. Ignore the tampering
A
Padmount transformer or switching kiosk shows evidence of being tampered with, such as hacksaw marks or severe dents, or is found open.
1. Assess the situation from at least 10 metres (33 t) back.
2. Determine the safe zone, secure the area, inform other emergency responders and keep people away.
3. Call the local electrical utility. Give the location and provide the transformer or switching kiosk location and number. Numbers are stenciled on the unit usually in yellow letering.
4. Wait for the local electrical utility to isolate and de-energize the kiosk and initiate repairs.
According to the Electrical Safety Hand Book, What precaution should be taken when approaching a vehicle that has damaged a padmount transformer or switching kiosk?**
- A. Run towards the vehicle
- B. Keep feet close together
- C. Immediately open the transformer
- D. Call the police
B
Padmount transformer or switching kiosk is damaged in a vehicle accident.
1. Assess the situation from at least 10 metres (33 t) back.
2. Determine the safe zone, secure the area, inform other emergency responders and keep people away.
3. Call the local electrical utility giving the location.
4. Keep feet close together when approaching the vehicle.
5. Tell occupants of the vehicle to “Stay in the vehicle. We are contacting the electrical utility”.
6. Call the local electrical utility and provide the transformer or switching kiosk location and number. Numbers are stenciled on the unit usually in large yellow letering.
7. Wait for electrical utility personnel to isolate and de-energize the padmount transformer. Be patient, it may take some time
According to the Electrical Safety Hand Book, What is the recommended distance to keep the public back in the case of a vault explosion or emitting fire or smoke?**
- A. 5 meters
- B. 10 meters
- C. 15 meters
- D. 20 meters
C
Assess the situation from at least 10 metres (33 t) away.
2. Determine the safe zone, secure the area, and keep the public at least 15 metres (50 t) back
According to the Electrical Safety Hand Book, If a service access cover is in place and a vault is emitting fire, smoke, or fumes, what should emergency responders do?**
- A. Immediately remove the service access cover
- B. Assess the situation from 2 meters away
- C. Call the local electrical utility
- D. Enter the vault to investigate
C
ACTION
1. Assess the situaion from at least 10 metres (33 t) away.
2. Determine the safe zone, secure the area, and keep the public at least 15 metres (50 t) back.
3. Call the local electrical uility, ask for assistance, and give the locaion of the service access
involved. Whether the vault cover is of or on always contact the uility.
4. Stop traic unil there is no danger of an explosion (secondary explosions can occur).
5. Do not atempt to remove the service access cover. If gases are present in the vault, removal of
the cover may produce a spark or provide sufficient air to cause an explosion
According to the Electrical Safety Hand Book, What is the main purpose of transformers in a substation?**
- A. To generate electricity
- B. To store electricity
- C. To reduce voltage and distribute it
- D. To control electricity flow
C
Transformers are devices used to step-up or step-down voltages.
According to the Electrical Safety Hand Book, What hazard can buildings in a substation present to emergency responders?**
- A. Low temperatures
- B. Explosive gases
- C. Lack of oxygen
- D. Excessive humidity
B
Substations and substation buildings present
different hazards from buildings that emergency responders usually enter and can endanger
anyone who is unfamiliar with them.
According to the Electrical Safety Hand Book, What is the primary danger associated with the oil-filled transformers in substations?**
- A. High temperatures
- B. Combustible oil
- C. Radioactive material
- D. Toxic gases
B
They usually contain large volumes of cooling insulating oil which is combustible and has a lash point of 145°C (295°F). Some of these oils may also contain small quantities of PCBs
According to the Electrical Safety Hand Book, Under what circumstances should emergency responders enter an electrical vault in a substation?**
- A. Anytime they want
- B. Only for routine inspections
- C. For rescue purposes after de-energization
- D. Without any confirmation from the utility
C
Emergency personnel should not enter any electrical vault except for the purpose of rescue and only when the electrical utility has confirmed that the electrical equipment has been de-energized.
According to the Electrical Safety Hand Book, Why is it important for emergency responders to have familiarization tours of substations in their service area?**
- A. To take photographs
- B. To understand the layout
- C. To meet electrical utility personnel
- D. To find potential hazards
D
During your preplanning, it is important to obtain emergency preparedness or emergency response plans and to arrange familiarization tours of substations in your service area
According to the Electrical Safety Hand Book, What action should emergency responders take if a digging machine inadvertently damages an underground live high voltage power line?**
- A. Attempt to repair the power line
- B. Assess the situation from 5 meters back
- C. Secure the area and call the local electrical utility
- D. Evacuate the immediate vicinity
C
ACTION
1. Assess the situation from at least 10 metres (33 t) back.
2. Determine the safe zone (10 metres, 33 t), secure the area, inform other emergency
responders and keep people back.
3. Call the local electrical utility. Give the location and provide the number of the nearest transformer or switching kiosk. Numbers are stenciled on the unit usually in yellow letering.
4. Tell the operator of the machinery to “Stay in the machine. We are contacting the electrical
utility”.
5. Wait for electrical utility personnel to isolate and de-energize the underground power line
