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Fire Safety Management > Electrical safety > Flashcards

Electrical safety Flashcards

0
Q

What are the standards for electrical safety

A

CNEC - Canadian National Electrical Code

OEC - Ontario Electrical Code

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1
Q

Why is electrical energy a hazard

A

it can act as both a source of heat or spark of ignition of a fuel which can subsequently develop into a fire

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2
Q

Why is electricity a hazard to humans

A

because human tissue is primarily water and water is an excellent conductor of electricity. tissues can very easily be damaged if electrical contact is made

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3
Q

where does electricity travel and what is its normal route

A

in closed circuits and via conductor

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4
Q

What is electrical shock

A

when the body becomes part of the circuit

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5
Q

Electrical shock occurs When an individual is in contact with the ground and contacts what 3 things

A

both wires of an electrical circuit

1 wire of an energized circuit and ground

metallic part that has become energized by contact with conductor

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6
Q

When do metal parts of electric tools become energized

A

If there is a break in the insulation of the tool or machine wiring

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7
Q

What does the breakdown in insulation or short circuiting to ground result in

A

material degradation
heat buildup
ignition if electrical arc intensity is sufficient to initiate combustion

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8
Q

What are the 3 hazard classifications for electrical equipment

A 
class 1: flammable liquids and gases
  Div 1: present in some form
  Div 2: not normally present 
class 2: combustible and or conducting dusts
class 3: fibers and lint
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9
Q

It is okay to use electrical equipment for 1 type of class for another. true or false

A

false

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10
Q

List areas of electrical equipment

A

electrical rooms: HVAC

computer and data center

switchyards and switchrooms: (transformers and capacitors)

Electical operated equipment

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11
Q

What does the CEC provide

A

basic technical guidance framework for all canadian jurisdictions to follow when it comes to overall safety relating to electrical systems in buildings

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12
Q

What is the CEC equivalent to

A

US NEC

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13
Q

What are the 3 types of hazardous locations as per NEC

A

Class 1 - one which is created by the presence of flammable gases or vapors in the air (natural gas or gasoline vapor) in sufficient quantities to be explosive or ignitable

Class 2 - areas made hazardous by the presence of combustible dust. finely pulverized material suspended in atm can cause powerful explosion as one in a petroleum refinery

Class 3 - areas where easily ignitable fibers are present due to the types of materials being handled, stored or processes. fibers are not suspended in air but collect around machinery or light fixtures where heat can ignite them

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14
Q

List examples of class 1 hazardous locations

A

petroleum refineries
spray finishing areas
dry cleaning planrs
utility gas plants

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15
Q

list examples of class 2 hazardous locations

A

grain elevators
flour and feed mills
producers of plastics, medicine, fireworks, starch, candies, mg or al powders
coal preparation plants

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16
Q

list examples of class 3 hazardous locations

A

textile mills
cotton gins or seed mills
flax processing plants

17
Q

How is static electricity generated

A

by contact and separation of dissimilar materials

when a fluid flows through a pipe or from a tank opening to another vessel or container

18
Q

what are the main hazards of static electricity

A

fire and explosion from sparks containing enough energy to ignite flammable vapors of flowing liquid

19
Q

what is the primary mean of reducing static electricty hazard

A

through the use of bonding or grounding when transferring as it prevents static electricity from igniting the gasoline vapors as its being pumped

20
Q

what is the purpose of grounding

A

to eliminate potential difference betwen object and earth

21
Q

what is grounding required for

A

class 1 flammable liquids

22
Q

Which materials can accumulate significant static charges? are they easily dispersed?

A

plastics (synthetic materials) and no

23
Q

When are objects said to be well bonded

A

when their charges flow freely between them and with no difference in charge exists between them

24
Q

Will bonding eliminate a static charge?

A

no

25
Q

what will bonding do

A

equalize the potential between the bonded objects so that a spark/arc wont occur

26
Q

When is bonding achieved

A

when there is a physical connection with a bond wire between 2 conductive objects in order to eliminate static charge potential difference

27
Q

When must one provide a bond wire and when is it unnecessary

A

between containers during flammable liquid filling operations UNLESS a metallic path between them is present

28
Q

Will bonding eliminate the different in potential between objects and earth?

A

NO unless one of the objects is connected to earth using a ground wire

29
Q

List some electrical equipment defects

A

vibration of electrical conneftions
floor leakage where wiring is exposed to waters, oils, alkalis, etc
insulation deterioration and damage
rodents
cable trays and passages containing multiple services
cable coverings wear and tear

30
Q

Is causation of fire by electrical source complex or simple

A

simple

31
Q

what can causation involving electrical energy and equipment be attributed to

A

operating ourside design and installation standards

misuse of equipment

failure to inspect and maintain

32
Q

List some electrical fires causation

A

overloading circuits
suspended lights in contact with combustible ceilings or other material
faulty ballast - overheating
dirty motors
improper flammable liquid storage
computer rooms
protable electrical equipment in hazardous areas

33
Q

Which section of NFPA deals with electrical safety

A

NFPA 70E

34
Q

What are GFCI

A

a device that protects a worker from dangerous electrical shock by detecting a ground fault almost instantaneously before the fault has the opportunity to be compelted with any current of significance.

35
Q

How fast does a GFCI shut off the electricity flow in the case of a ground fault

A

1/40 of a second

36
Q

where does a GFCi detect differences in current

A

ordinary household wires - black and white circuit wires

37
Q

What are clues that an electrical hazard exists

A

tripped circuit breaker or blown fuse
warm tools, wires, cords, connections or junction boxes
GFCI shuts off a circuit
worn/frayed insulation around wire or connection

38
Q

What is the ESA

A

Electrical Safety Authority

not for profit organization that is set up to administer the ESC in Ontario

39
Q

What does the ESA provide

A

annual reports on status of electrical safety in province

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