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Flashcards in PEC CHAPTER 5 SPECIAL OCCUPANCIES Deck (75):
1

Reference Standards of Hazardous Locations


 National Fire Protection Association (NFPA)
 American Petroleum Institute (API)
 Instrumentation Systems and Automation Society (ISA)

2

Locations have been classified depending on the properties of the flammable vapors, liquid, or gasses, or combustible dusts or fibers that may be present.

HAZARDOUS LOCATIONS

3

Flammable gases or vapor are present in air which is sufficient to produce explosive or ignitable mixtures.

CLASS I LOCATIONS

4


a) Ignitable concentrations of flammable gases or vapors can exist.
b) Existence of gas due to frequent repair or maintenance operation or because of leakage.
c) Release of such gasses due to breakdown, failure or faulty operation of equipment.

CLASS I, DIVISION 1

5


a) Volatile flammable liquids or flammable gases are handled, processed, but in which liquids and gases are confined and can escape only in case of accidental rupture or breakdown, or such abnormal operation.
b) Mechanical ventilations prevent ignitable concentrations of gases or vapors and failure or abnormal operation might become hazardous.
c) Gases or vapors might occasionally be communicated unless such communication is prevented by adequate positive-pressure ventilation from a source of clean air

CLASS I, DIVISION 2

6

Locations that has presence of combustible dust.

CLASS II LOCATIONS

7


a) Combustible dust is in the air under normal operating conditions.
b) Where mechanical failure of abnormal operation of machinery or equipment might cause such explosive or ignitable mixtures to be produced.
c) Group E combustible dusts may be present in quantities sufficient to be hazardous.

CLASS II, DIVISION 1

8


a) Presence of combustible due to abnormal operations
b) Dust accumulations are present in normal operation but are insufficient to be hazardous but infrequent malfunctioning of handling/processing equipment it would be hazardous

CLASS II, DIVISION 2

9

Locations that has the presence of ignitable fibers or flyings.

CLASS III LOCATIONS

10

Ignitable fibers are handled, manufacture or used.

CLASS III, DIVISION 1

11

Ignitable fibers are stored, handled and manufactured

CLASS III, DIVISION 2

12

MATERIAL GROUPS

MESG

Maximum Experimental Safe Gap

13

MATERIAL GROUPS

MIC

Minimum Igniting Current Ratio

14

MATERIAL GROUPS

CLASS I GROUP CLASSIFICATIONS

Acetylene

Group A-

15

MATERIAL GROUPS

CLASS I GROUP CLASSIFICATIONS

Flammable gas, flammable liquid-produced vapor, or combustible liquid-produced vapor mixed with air that may burn or explode, MESG value is less than or equal 0.45 mm, MIC ratio is less than or equal to 0.40 mm.

Group B

16

MATERIAL GROUPS

CLASS I GROUP CLASSIFICATIONS

Flammable gas, flammable liquid-produced vapor, or combustible liquid-produced vapor mixed with air that may burn or explode, MESG value is greater than 0.45 mm and less than or equal to 0.75 mm, MIC ratio than 0.40 and less than or equal to 0.80.

Group C

17

MATERIAL GROUPS

CLASS I GROUP CLASSIFICATIONS

Flammable gas, flammable liquid-produced vapor, or combustible liquid-produced vapor mixed with air that may burn or explode, MESG value > 0.75 mm, MIC ratio > 0.80.

Group D

18

MATERIAL GROUPS

CLASS II GROUP CLASSIFICATIONS

Atmospheres containing combustible metal dusts, including aluminum, magnesium, and their commercial alloys, or other combustible dusts whose particle size, abrasiveness, and conductivity present similar hazards in the use of electrical equipment

Group E

19

MATERIAL GROUPS

CLASS II GROUP CLASSIFICATIONS

Atmospheres containing combustible carbonaceous dusts that have more than 8 percent total entrapped volatiles. Carbonaceous dust ex. Coal, carbon black, charcoal, and coke dusts.

Group F

20

MATERIAL GROUPS

CLASS II GROUP CLASSIFICATIONS

Atmospheres containing combustible dusts not included in Group E or F, including flour, grain, wood, plastic, and chemicals.

Group G

21

CLASS I, ZONE 0, 1, AND 2 LOCATIONS

Types of Protection:

- Encloses the parts w/c could ignite the atmosphere by sparking or heating.

Encapsulation “m.”

22

CLASS I, ZONE 0, 1, AND 2 LOCATIONS

Types of Protection

- Enclosure can withstand an internal explosion of flammable mixture that has penetrated into the interior, without suffering damage and w/o causing ignition in joints or openings.

Flameproof “d.”

23

CLASS I, ZONE 0, 1, AND 2 LOCATIONS

Types of Protection:

- Applied to electrical equipment that does not produce arcs in normal service and under specified abnormal conditions, increased security is given against the possibility of excessive temperatures and of the occurrence of arcs and sparks.

Increased Safety “e.”

24

CLASS I, ZONE 0, 1, AND 2 LOCATIONS

Types of Protection:

- Any spark or thermal effect is incapable of causing ignition of a mixture of flammable or combustible material in air under prescribed test conditions.

Intrinsic Safety “i.”

25

CLASS I, ZONE 0, 1, AND 2 LOCATIONS

Types of Protection:

- Electrical equipment is immersed in a protective liquid in such a way that an explosive atmosphere that may be above the liquid or outside the enclosure cannot be ignited.

Oil Immersion “o.”

26

CLASS I, ZONE 0, 1, AND 2 LOCATIONS

Types of Protection:

- Electrical parts capable of igniting an explosive atmosphere are fixed in position and completely surrounded by filling material (glass or quartz powder) to prevent the ignition of an external explosive atmosphere

Powder Filling “q.”

27

CLASS I, ZONE 0, 1, AND 2 LOCATIONS

Types of Protection:

- Electrical equipment, in normal operation, is not capable of igniting a surrounding explosive gas atmosphere and a fault capable of causing ignition is not likely to occur.

Type of Protection “n.”

28

CLASS I, ZONE 0, 1, AND 2 LOCATIONS

Classification of Locations:

a) Ignitable concentrations of flammable gas/vapors are not likely to occur under normal conditions; but if they do, will exist only for short period
b) Volatile flammable liquids or flammable gases are handled, processed, but in which liquids and gases are confined and can escape only in case of accidental rupture or breakdown, or such abnormal operation.

Class I, Zone 2

29

CLASS I, ZONE 0, 1, AND 2 LOCATIONS

Classification of Locations:

- Ignitable concentrations of flammable gases or vapors are present continuously or for long periods of time

Class I, Zone 0

30

CLASS I, ZONE 0, 1, AND 2 LOCATIONS

Classification of Locations:

a) Ignitable concentrations of flammable gas/vapors may exist under normal conditions
b) Ignitable concentrations of flammable gas/vapors may exist because of repair/ maintenance
c) Equipment breakdown or faulty operation could result in the release of ignitable concentrations of flammable gas/vapors

Class I, Zone 1

31

CLASS I, ZONE 0, 1, AND 2 LOCATIONS

Zone Equipment Marking

Equipments shall be marked with all the following in the order shown: (6)

a) Class
b) Zone
c) Symbol ―AEx‖
d) Protection technique(s)
e) Applicable gas classification group(s)
f) Temperature classification

32

ZONE 20, 21, AND 22 LOCATIONS

- An area where combustible dust or ignitable fibers and flyings are present continuously or for long periods of time in quantities sufficient to be hazardous

Zone 20 Hazardous (Classified) Locations

33

ZONE 20, 21, AND 22 LOCATIONS


- An area where combustible dust or ignitable fibers and flyings are likely to exist occasionally under normal operation in quantities sufficient to be hazardous.

Zone 21 Hazardous (Classified) Locations

34

ZONE 20, 21, AND 22 LOCATIONS

- An area where combustible dust or ignitable fibers and flyings are not likely to occur under normal operation in quantities sufficient to be hazardous.

Zone 22 Hazardous (Classified) Locations

35

HEALTH CARE FACILITIES

General Care Areas

- Shall be supplied by at least 2 branch circuits, one for the emergency system and the other for the normal system.


Patient Bed Location

36

HEALTH CARE FACILITIES

General Care Areas

Patient Bed Location Receptacles - Shall be provided with a minimum of ______________ either a single or duplex types or a combination of both. All receptacles, whether four or more, shall be listed ―hospital grade‖ and so identified.

4 receptacles

37

HEALTH CARE FACILITIES

General Care Areas

__________ Receptacles located within the rooms, bathrooms, playrooms, activity rooms, and patient care areas of pediatric wards shall be listed ___________

Pediatric Locations

tamper resistant.

38

HEALTH CARE FACILITIES

Critical Care Areas

Each branch of the emergency system and each equipment system shall have one or more______________. One transfer switch shall be permitted to serve one or more branches or systems in a facility with a maximum demand on the essential electrical system of __.

transfer switches

150 KVA

39

HEALTH CARE FACILITIES

Critical Care Areas

- Shall be supplied by at least _________, one for the emergency system and the other for the normal system. At least_ branch circuit from emergency system shall supply an outlet(s) only at that bed location.

Patient Bed Location Branch Circuits

2 branch circuits

1

40

HEALTH CARE FACILITIES

Critical Care Areas

Patient Bed Location Receptacles
- Shall be provided with a minimum of____ and listed
―hospital grade‖. Each receptacle shall be grounded by _____ equipment grounding conductor.


6 receptacles

copper

41

HEALTH CARE FACILITIES

Critical Care Areas

- Ground-fault circuit-interrupter protection for personnel shall not be required for receptacles installed in those critical care areas where the ________(2) are installed within the patient room.


toilet and basin

42

HEALTH CARE FACILITIES

Critical Care Areas

Patient Vicinity Grounding and Bonding (Optional) - An equipment bonding jumper not smaller than __________ shall be used to connect the grounding terminal of receptacles.

5.5 mm2 (2.6 mm dia.)

43

HEALTH CARE FACILITIES

Critical Care Areas

- Equipment grounding conductor for special-purpose receptacles, such as operation of mobile X-ray equipment, shall be extended to the ___________ of the branch circuits.

Special-Purpose Receptacle Grounding

reference grounding points

44

HEALTH CARE FACILITIES

Task Illumination and Selected Receptacles for Critical Branch

- The _________ of the emergency system shall supply power for task illumination, fixed equipment, selected receptacles, and special power circuits serving the following areas and functions related to patient care:

critical branch

45

HEALTH CARE FACILITIES

Task Illumination and Selected Receptacles for Critical Branch (9)

1. Critical care areas that utilize anesthetizing gases
2. The isolated power systems in special environments
3. Patient care areas - task illumination and selected receptacles in the following:
a. Infant nurseries
b. Medication preparation areas
c. Pharmacy dispensing areas
d. Selected acute nursing areas
e. Psychiatric bed areas (omit receptacles)
f. Ward treatment rooms
g. Nurses’ stations (unless adequately lighted by corridor luminaires)
4. Additional specialized patient care task illumination and receptacles, where needed
5. Nurse call systems
6. Blood, bone, and tissue banks
7. Telephone equipment rooms and closets
8. Task illumination, selected receptacles, and selected power circuits for the following:
a. General care beds (at least one duplex receptacle per patient bedroom)
b. Angiographic labs
c. Cardiac catheterization labs
d. Coronary care units
e. Hemodialysis rooms or areas
f. Emergency room treatment areas (selected)
g. Human physiology labs
h. Intensive care units
i. Postoperative recovery rooms (selected)
9. Additional task illumination, receptacles, and selected power circuits needed

46

ASSEMBLY OCCUPANCIES

- Assembly occupancies shall include, but not be limited to, the following:


Armories Assembly Halls Auditoriums Bowling lanes Club rooms Conference rooms Courtrooms
Dance halls
Dining and drinking facilities Exhibition halls Gymnasiums
Mortuary chapels Multipurpose rooms Museums
Places of awaiting transportation Places of religious worship
Pool rooms Restaurants Skating rinks

47

ASSEMBLY OCCUPANCIES

Temporary Wiring- Flexible cables and cords approved for hard or extra-hard usage shall be permitted to be _______ where protected from contact by the general public

laid on floors

48

ASSEMBLY OCCUPANCIES

Wiring in General- The fixed wiring methods shall be metal raceways, flexible metal raceways, nonmetallic raceways encased in not less than ____(mm) of concrete, Type MI, MC, or AC cable with an insulated EGC.

50 mm

49

THEATERS, AUDIENCE AREAS OF MOTION PICTURE AND TELEVISION STUDIOS, PERFORMANCE AREAS, AND SIMILAR LOCATIONS

Wiring Methods

The fixed wiring method shall be metal raceways, nonmetallic raceways encased in at least ____(mm) of concrete Type __________(3) containing an insulated equipment grounding conductor

50 mm

MI cable, MC cable, or AC cable

50

THEATERS, AUDIENCE AREAS OF MOTION PICTURE AND TELEVISION STUDIOS, PERFORMANCE AREAS, AND SIMILAR LOCATIONS

Dressing Rooms

___________ shall not be installed in dressing rooms.

Pendant lampholders

51

THEATERS, AUDIENCE AREAS OF MOTION PICTURE AND TELEVISION STUDIOS, PERFORMANCE AREAS, AND SIMILAR LOCATIONS

Dressing Rooms

Lamp Guards - All exposed incandescent lamps in dressing rooms, where less than _______(mm) from the floor, shall be equipped with ________ riveted to the outlet box cover or otherwise______ in place.

2 400 mm

open-end guards

sealed or locked

52

THEATERS, AUDIENCE AREAS OF MOTION PICTURE AND TELEVISION STUDIOS, PERFORMANCE AREAS, AND SIMILAR LOCATIONS

Dressing Rooms

Switches Required - All lights and any receptacles adjacent to the mirror(s) and above the dressing table counter(s) installed in dressing rooms shall be controlled by _______ installed in the dressing room(s). Each switch controlling receptacles ______ to the mirror(s) and above the dressing table counter(s) shall be provided with a _____ located ____ the dressing room, ______ to the door to indicate when the receptacles are ______.

wall switches

adjacent

pilot light

outside

adjacent

energized

53

THEATERS, AUDIENCE AREAS OF MOTION PICTURE AND TELEVISION STUDIOS, PERFORMANCE AREAS, AND SIMILAR LOCATIONS

CARNIVALS, CIRCUSES, FAIRS, AND SIMILAR EVENTS

Overhead Conductor Clearances

Amusement rides and amusement attractions shall be maintained not less than _____(mm) in any direction from overhead conductors which are rated _____V, nominal, less or higher

4500 mm

600V

54

THEATERS, AUDIENCE AREAS OF MOTION PICTURE AND TELEVISION STUDIOS, PERFORMANCE AREAS, AND SIMILAR LOCATIONS

CARNIVALS, CIRCUSES, FAIRS, AND SIMILAR EVENTS

Disconnecting Means

Each ride and concession shall be provided with __________ or ________ located within sight and within ______(mm) of the operator’s station

fused disconnect switch
circuit breaker

1800 mm

55

THEATERS, AUDIENCE AREAS OF MOTION PICTURE AND TELEVISION STUDIOS, PERFORMANCE AREAS, AND SIMILAR LOCATIONS

CARNIVALS, CIRCUSES, FAIRS, AND SIMILAR EVENTS

Portable Distribution or Termination Box

Where installed outdoors, the box shall be of ______ construction and mounted so that the bottom of the enclosure is not less than _____(mm) above the ground.



weatherproof

150 mm

56

MOTION PICURE AND TELEVISION STUDIOS AND SIMILAR LOCATIONS

Permanent Wiring

Shall be Type _________(2) containing equipment grounding.

MC Cable, Type AC cable

57

MOTION PICTURE PROJECTION ROOMS

Work Space

Each motion picture projector, floodlight, spotlight, or similar equipment shall have clear working space not less than _____(mm) on each side and at the rear thereof.

800 mm wide

58

MOTION PICTURE PROJECTION ROOMS

Conductor Size

Conductors supplying outlets for ______ projectors of the professional type shall not be smaller than __________(mm2) and shall be of sufficient size for the projector employed.

arc and xenon

8.0 mm2

59

MOBILE HOMES, MANUFACTURED HOMES, AND MOBILE PARKS


_________________________Shall not be required to meet the provisions for the number or capacity of circuits required.

Mobile Homes Not Intended as Dwelling Unit

60

MOBILE HOMES, MANUFACTURED HOMES, AND MOBILE PARKS

Power Supply

Feeder - Not more than one listed ___A mobile home power supply cord with an integrally molded or securely attached plug cap or a permanently installed feeder.

50A

61

MOBILE HOMES, MANUFACTURED HOMES, AND MOBILE PARKS

Power Supply

Attachment Plug Cap -

Shall be a 2-pole, 3-wire, grounding type, rated 50 amperes, 250 volts or 3- pole, 4-wire, grounding type, rated 50 amperes, 125/250 volts and intended for use with the 50- ampere, 250-volt and 125/250-volt receptacle.

62

MOBILE HOMES, MANUFACTURED HOMES, AND MOBILE PARKS

Power Supply

Overall Length of a Power-Supply Cord

- Shall not be less than ______(mm) and shall not exceed
__m - The length of the cord from the face of the attachment plug cap to the point where the cord enters the mobile home shall not be less than ______m

6400 mm

11 m

6000 m.

63

MOBILE HOMES, MANUFACTURED HOMES, AND MOBILE PARKS

Marking
- The power-supply cord shall bear the following marking:

―FOR USE WITH MOBILE HOMES - 40 AMPERES‖

or

―FOR USE WITH MOBILE HOMES - 50 AMPERES

64

MOBILE HOMES, MANUFACTURED HOMES, AND MOBILE PARKS

Point of Entrance
- The point of entrance shall be in the _________(3)

exterior wall, floor, or roof

65

MOBILE HOMES, MANUFACTURED HOMES, AND MOBILE PARKS

Protected

- Shall be permitted to be installed within the mobile home walls, provided a continuous raceway having a maximum size of _______(mm) is installed from the________ to the _______ of the mobile home floor.

30 mm

branch-circuit panelboard

underside



66

RECREATIONAL VEHICLES AND RECREATIONAL VEHICLE PARKS

Means for Connecting to Power Supply

Cord - The cord exposed usable length, measured to the point of entry on the vehicle exterior, shall be a minimum of __________(mm) where the point of entrance is at the side of the vehicle or shall be a minimum __________(mm) where the point of entrance is at the rear of the vehicle

7600 mm

9000 mm

67

RECREATIONAL VEHICLES AND RECREATIONAL VEHICLE PARKS

Means for Connecting to Power Supply

Label at Electrical Entrance - Shall have permanently affixed to the exterior skin, at or near the point of entrance of the power-supply cord(s), a label _______(mm x mm) minimum size, made of etched, metal-stamped, or embossed brass, stainless steel, or anodized or alum/clad >_________.



75 mm × 45 mm

0.50 mm thick

THIS CONNECTION IS FOR 115/230VOLT AC, 3-POLE, 4-WIRE, 60 HZ, AMPERE SUPPLY

68

RECREATIONAL VEHICLES AND RECREATIONAL VEHICLE PARKS

Means for Connecting to Power Supply

d) Location - The assembly shall be located within ________(mm) of the rear, on the left (road) side or at the rear, left of the longitudinal center of the vehicle, within ______ (mm) of the outside wall.

4500 mm -rear

460 mm - outside wall

69

FLOATING BUILDING

_____________________Shall be located adjacent to, but not in or on, the building or any floating structure.

Location of Service Equipment

70

FLOATING BUILDING

Feeder Conductors


Each floating building shall be supplied by a ____ set of feeder conductors from its ________.

single

service equipment

71

MARINAS AND BOATYARDS

- An enclosed assembly that can include receptacles, circuit breakers, fused switches, fuses, watt-hour meter(s), and monitoring means approved for marine use.

Marine Power Outlet

72

MARINAS AND BOATYARDS

Distribution System

- Yard and pier distribution systems shall not exceed _______V phase to phase

600 volts

73

MARINAS AND BOATYARDS

Electrical Connections

- All electrical connections shall be located at least ______(mm) above the deck of a floating pier. All electrical connections shall be located at least ______(mm) above the deck of a fixed pier but not below the electrical datum plane

300 mm

300 mm

74

MARINAS AND BOATYARDS

Electrical Datum Plane

1. In land areas subject to tidal fluctuation, the electrical datum plane is a horizontal plane _____ (mm)above the highest tide level for the area occurring under normal circumstances, that is, highest high tide.

2. The electrical datum plane for floating piers and landing stages are the following:

a) Installed to permit ______ response to water level, without __________.
b) A horizontal plane _________ (mm) above the water level at the floating pier or landing stage and a minimum of _____(mm) above the level of the deck.

600 mm

rise and fall

lateral movement

800 mm

300 mm

75

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