North Dakota Administrative Code › Title 24.1 - State Electrical Board › Article 24.1-06 - ELECTRICAL WIRING STANDARDS › Chapter 24.1-06-50 › Appendix A

Current through Supplement No. 393, July, 2024
Short Cut At 75° C
Voltage Drop Formulas 167° F
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or
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L = length in feet, one way
I = load in amps
E = Volts
C.M.A. = circular-mil area
K-factor = 25.8 multiplying factor for copper, 42.4
				  multiplying factor for aluminum at 75° C.
Percent drop = permissible voltage drop times voltage of
				  circuit as follows:
3% of 208 = 208 x .03 = 6.24 volts
3% of 120 = 120 x .03 = 3.6 volts
3% of 240 = 240 x .03 = 7.2 volts
5% of 240 = 240 x .05 = 12.0 volts
Example:
240 volts, 1,000 ft. distance, 10 ampere load, 5% drop
25.8 x 1,000 = 25,800 x 10 = 258,000
258,000 divided by 26,250 (C.M.A. of No. 6) = 9.8 volts (less
				  than 5%)
258,000 divided by 16,510 (C.M.A. of No. 8) = 15.6 volts
				  (more than 5%)
120 volts, 8 ampere load, 100 ft. distance, 3% drop
25.8 x 100 = 2,580 x 8 = 20,640
20,640 divided by 6,530 (C.M.A. of No. 12) = 3.16 volts (less
				  than 3%)
20,640 divided by 4,107 (C.M.A. of No. 14) = 5.0 volts (more
				  than 3%)
or
25.8 x 8 amps x 100 ft. = 20,640
20,640 divided by 3.6 (volts representing 3%) = 5,733 C.M.A.
				  (No. 12)
For 3-phase circuits, use formula, then multiply the results
				  by .86.
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Means of Egress Condensed Guide
1. Marking of means of egress. All required exits and access
				  to exits shall be marked by readily visible signs. For externally illuminated
				  signs, letters may not be less than six inches [150 millimeters] high.
				  Internally illuminated signs must be listed per ANSI/UL 924 which assures
				  proper letter size. Chevron-shaped arrows are required to indicate direction to
				  exits. Every sign must be suitably illuminated. For externally illuminated
				  signs see subsection 7.10.6, Life Safety Code®, NFPA 101, 2015 edition and
				  for internally illuminated signs see subsection 7.10.7.
2. Illumination of means of egress. Illumination of means of
				  egress must provide continuous, dependable, illumination of not less than one
				  foot-candle at floor level for all areas such as corridors, stairways, and exit
				  doorways, providing a lighted path of travel to the outside of the building and
				  public way during all times that the means of egress is available for use. For
				  new stairs, the required minimum illumination level is ten foot-candle during
				  conditions of stair use. Illumination must be from a source of reasonable
				  assured reliability and may be supplied from normal lighting circuits or
				  special circuits with switching controlled by authorized personnel.
				  Illumination required for exit marking also must serve for illumination of
				  means of egress and be so arranged that failure of a single unit, such as
				  burning out of a single bulb will not leave any area in darkness.
3. Emergency lighting. Emergency lighting systems must be so
				  arranged to provide the required illumination automatically in event of any
				  interruption or failure of the normal power supply. An acceptable alternate
				  source of power may be an electric generator or approved battery. In
				  occupancies where emergency lighting is required, the circuits supplying exit
				  marking and illumination of means of egress must be supplied by the emergency
				  system. Other areas of the facilities only requiring exit marking and
				  illumination of means of egress may be supplied by the normal source.
4. Classification of occupancy based on chapter 6, Life
				  Safety Code®, NFPA 101, 2015 edition.
Note: Check with local building officials to determine
				  occupancy and occupant load.
Assembly. Assembly occupancies include all buildings or
				  portions of buildings used for gathering together fifty or more persons for
				  such purposes as deliberation, worship, entertainment, eating, drinking,
				  amusement, or awaiting transportation. Assembly occupancies also include
				  special amusement buildings regardless of occupant load.
Assembly occupancies might include the following:
Armories
Libraries
Assembly halls
Mortuary chapels
Auditoriums
Motion picture theaters
Bowling lanes
Museums
Clubrooms
Passenger stations and terminals of air, surface,
								underground, and marine public transportation facilities
Colleges and university
Places of religious worship
Classrooms, fifty persons and over
Poolrooms
Conference rooms
Recreation piers
Courtrooms
Restaurants
Dance halls
Skating rinks
Drinking establishments
Theaters
Exhibition halls
Gymnasiums
Occupancy of any room or space for assembly purposes by fewer
				  than fifty persons in a building or other occupancy and incidental to such
				  other occupancy must be classified as part of the other occupancy and is
				  subject to the provisions applicable thereto.
Educational. Educational occupancies include all buildings or
				  portions of buildings used for educational purposes through the twelfth grade
				  by six or more persons for four or more hours per day or more than twelve hours
				  per week.
Educational occupancies include the following:
Academies
Schools
Kindergartens
Other occupancies associated with educational institutions
				  shall be in accordance with the appropriate part of Life Safety Code®, NFPA
				  101, 2015 edition.
In cases when instruction is incidental to some other
				  occupancy, the section of Life Safety Code®, NFPA 101, 2015 edition,
				  governing such other occupancy applies. For example:
College and university classrooms under fifty persons -
				  business occupancy
College and university classrooms fifty persons and over -
				  assembly
Instructional building - business occupancy
Laboratories, instructional - business occupancy
Laboratories, noninstructional - industrial
Day care. Day care occupancies include all buildings or
				  portions of buildings in which four or more clients receive care, maintenance,
				  and supervision, by other than their relatives or legal guardians, for less
				  than twenty-four hours per day.
Day care occupancies include the following:
Child day care occupancies
Adult day care occupancies, except where part of a health
				  care occupancy
Nursery schools
Day care homes
Kindergarten classes that are incidental to a child day care
				  occupancy
In areas when public schools offer only half-day kindergarten
				  programs, many child day care occupancies offer state-approved kindergarten
				  classes for children who require full day care. As these classes are normally
				  incidental to the day care occupancy, the requirements of the day care
				  occupancy should be followed.
Health care. Health care occupancies are those used for
				  purposes such as medical or other treatment or care of persons suffering from
				  physical or mental illness, disease, or infirmity and for the care of infants,
				  convalescents, or infirm aged persons. Health care occupancies provide sleeping
				  facilities for four or more occupants and are occupied by persons who are
				  mostly incapable of self-preservation because of age, physical or mental
				  disability, or because of security measures not under the occupants'
				  control.
Health care occupancies include the following:
Hospitals
Nursing homes
Limited care facilities
Ambulatory health care. Ambulatory health care occupancies
				  are those used to provide services or treatment simultaneously to four or more
				  patients on an outpatient basis. The patients are considered incapable of
				  self-preservation due to the treatment rendered, the use of anesthesia, or the
				  injury for which they are receiving emergency or urgent care.
Detention and correctional. Detention and correctional
				  occupancies are used to house individuals under varied degrees of restraint or
				  security and are occupied by persons who are mostly incapable of
				  self-preservation because of security measures not under the occupants'
				  control.
Detention and correctional occupancies include the
				  following:
Adult and juvenile substance abuse centers
Adult and juvenile work camps
Adult community residential centers
Adult correctional institutions
Adult local detention facilities
Juvenile community residential centers
Juvenile detention facilities
Juvenile training schools
Residential. Residential occupancies are those occupancies in
				  which sleeping accommodations are provided for normal residential purposes and
				  include all buildings designed to provide sleeping accommodations.
Exception. Those classified under health care or detention
				  and correctional occupancies.
Residential occupancies are treated separately in Life Safety
				  Code®, NFPA 101, 2015 edition, in the following groups:
One-family and two-family dwelling unit
Lodging or rooming house
Hotels
Dormitory
Apartment building
Residential board and care occupancy
Mercantile occupancy. An occupancy used for the display and
				  sale of merchandise.
Mercantile occupancies include the following:
Auction rooms
Department stores
Drugstores
Restaurants with fewer than fifty persons
Shopping centers
Supermarkets
Office, storage, and service facilities incidental to the
				  sale of merchandise and located in the same building should be considered part
				  of the mercantile occupancy.
Business. Business occupancies are those used for the
				  transaction of business other than those covered under mercantile.
Business occupancies include the following:
Air traffic control towers (ATCTs)
Doctors' offices
City halls
Townhalls
College and university instructional buildings,
								classrooms under fifty persons, and instructional laboratories
General offices
Courthouses
Outpatient clinics, ambulatory Dentists'
								offices
Doctors' and dentists' offices are included unless of such
				  character as to be classified as ambulatory health care occupancies.
Industrial. Industrial occupancies include factories making
				  products of all kinds and properties devoted to operations such as processing,
				  assembling, mixing, packaging, finishing or decorating, and repairing.
Industrial occupancies include the following:
Dry cleaning plants
Power plants
Factories of all kinds
Pumping stations
Food processing plants
Refineries
Gas plants
Sawmills
Hangars (for servicing or maintenance)
Telephone exchanges
Laundries
In evaluating the appropriate classification of laboratories,
				  the authority having jurisdiction should determine each case individually based
				  on the extent and nature of the associated hazards. Some laboratories may be
				  classified as occupancies other than industrial, for example, a physical
				  therapy laboratory or a computer laboratory.
Storage. Storage occupancies include all buildings or
				  structures utilized primarily for the storage or sheltering of goods,
				  merchandise, products, vehicles, or animals.
Storage occupancies include the following:\
Barns
Hangars (for storage only)
Bulk oil storage
Parking structures
Cold storage
Warehouses
Freight terminals
Truck and marine terminals
Grain elevators
Storage occupancies are characterized by the presence of
				  relatively small numbers of persons in proportion to the area. Any new use that
				  increases the number of occupants to a figure comparable with other classes of
				  occupancy changes the classification of the building to that of the new
				  use.
Multiple occupancies. A building or structure in which two or
				  more classes of occupancy exists shall be classified as a multiple occupancy.
				  Multiple occupancies must be protected either as mixed occupancies or as
				  separated occupancies, in accordance with subsection 6.1-14.3 or 6.1-14.4,
				  respectively, of Life Safety Code®, NFPA 101, 2015 edition. Where exit
				  access from an occupancy traverses another occupancy, the multiple occupancy
				  must be protected as a mixed occupancy. In implementing the mixed occupancies
				  form of protection, the building must comply with the most restrictive
				  requirements of the occupancies involved, unless separate safeguards are
				  approved.
5. Occupant load factor table.
Use
Square Feet per Person
Assembly use - less concentrated use
15 net*
Areas of concentrated use without fixed
								seating
7 net*
Waiting space
3 net*
Bleachers, pews, and similar bench-type
								seating
Note 1
Fixed seating
Note 2
Kitchens
100 gross**
Libraries
In stack areas
100 gross**
In reading rooms
50 net*
Swimming pools
Water surface
50 gross**
Pool decks
30 gross**
Stages
15 net*
Educational use
Classroom area
20 net*
Shops, laboratories, and similar vocational
								areas
50 net*
Day care use
Maximum number of persons intended to occupy that
								floor, but not less than
35 net*
Health care use
Sleeping departments
120 gross**
Inpatient departments
240 gross**
Ambulatory health care
150 gross**
Detention and correctional use
Maximum number of persons intended to occupy that
								floor, but not less than
120 gross**
Residential use
Hotels, motels, dormitories, apartment
								buildings:
Maximum probable population, but not less
								than
200 gross**
Residential board and care use
Note 3
Mercantile use (including malls)
Street level and below (sales)
30 gross**
Upper floor (sales)
60 gross**
Storage, receiving, or shipping (not open to the
								general public)
300 gross**
Assembly areas
See "Assembly"
Business use (other than below)
100 gross**
Concentrated business use
50 gross**
Air traffic control tower observation levels
40 gross**
Other purposes
Note 4
Industrial use
General and high hazard industrial
100 gross**
Special purpose industrial
N/A
Storage use
In storage occupancies
N/A
In mercantile occupancies
300 gross**
In other than storage and mercantile
								occupancies
500 gross**
* Net floor area is the actual occupied area, not including
				  accessory unoccupied areas or thickness of walls.
** Gross floor area is the floor area within the inside
				  perimeter of the outside walls of the building under consideration with no
				  deduction for hallways, stairs, closets, thickness of interior walls, columns,
				  or other features.
Notes to occupant load table.
Note 1. Bleachers, pews, and similar bench-type seating: one
				  person per eighteen linear inches.
Note 2. Fixed seating. The occupant load of an area having
				  fixed seats shall be determined by the number of fixed seats installed.
				  Required aisle space serving the fixed seats shall not be used to increase the
				  occupant load.
Note 3. Refer to chapters 32 and 33 of Life Safety Code®,
				  NFPA 101, 2015 edition.
Note 4. Occupant load factors associated with the use.
6. Building classification table.
x - indicates required
o - indicates not required
Occupancy
Marking of Means Egress
Illumination of Means Egress
Emergency Lighting
Assembly
x
x
x
Educational
x
x
x
Day care
x
x
x
Interior stairs and corridors
x
x
x
Assembly use spaces
x
x
x
Flexible and open plan buildings
x
x
x
Interior or limited access portions of
								buildings
x
x
x
Shops and laboratories
x
x
x
Family day care homes (more than three but fewer
								than seven persons)
o
x
o
Group day care homes fseven to twelve
								persons')
o
x
o
Health care occupancies CNote 1) ffor complete
								details see article 517 of NEC and NFPA standard 99)
o
x
x
Detention and correctional
x
x
x
Residential
Hotels and dormitories
x
x
x Note 2
Apartment buildinos
Twelve or less apartments
x
x
o Note 3
More than twelve apartments or greater than three
								stories in heiaht
x
x
x Note 3
Residential board and care
x
More than sixteen residents
x
x Note 2
Mercantile
Class A - Over thirty thousand square feet [2787.09
								square meters] or oreater than three stories
x
x
x
Class B - Three thousand square feet to thirty
								thousand square feet [278.71 square meters to 2787.09 square meters] or three
								thousand square feet [278.71 square meters] or less and two or three
								stories
x
x
x
Class C - Under three thousand square feet [278.71
								square meters] and one story
x Note 5
x
o
Malls
x
x
x
Business
x
x
o
Three or more stories in heiaht
x
x
x
Fifty or more persons above or below level of exit
								discharoe
x
x
x
Three hundred or more persons
x
x
x
All limited access and underground
x
x
x
Industrial
x
x Note 6
x Note 6 and 7
Storaae
x
x Note 8
x Note 8 and 9
Special structures (refer to chapter 11. Life Safety
				  Code®, NFPA 101, 2015 edition).
Mixed occupancies (Note 5).
NOTES:
Note 1. Exception: Power supply for exit and emergency
				  lighting shall conform to NFPA 110.
Note 2. Exception: Where each guest room, guest suite, or
				  resident sleeping room has an exit direct to the outside of the building at
				  street or ground level emergency lighting is not required.
Note 3. Exception: Buildings with only one exit need not be
				  provided with exit signs.
Note 4. Exception: Where the same means of egress serve
				  multiple use or combined occupancies, exit lighting, exit signs, and emergency
				  lighting shall be provided for the occupancy with the most stringent lighting
				  requirements. The occupant load of each type of occupancy shall be added to
				  arrive at the total occupant load.
Note 5. Exception: Where an exit is immediately apparent from
				  all portions of the sales area, the exit marking is not required.
Note 6. Exception: Special purpose industrial occupancies
				  without routine human habitation.
Note 7. Exception: Structures occupied only during daylight
				  hours, with skylights or windows arranged to provide the required level of
				  illumination on all portions of the means of egress during these hours.
Note 8. Exception: Storage occupancies do not require
				  emergency lighting when not normally occupied.
Note 9. Exception: In structures occupied only during
				  daylight hours, with skylights or windows arranged to provide the required
				  level of illumination of all portions of the means of egress during these
				  hours, emergency lighting is not required.
Fire Alarm System Condensed Guide
O - NOT required X - required
Occupancy
Manual Stations
Smoke Detector
Heat Detector
Flow Switch
Fire Station Alarm
Assembly under three hundred
o
o
o
o
o
Assembly over three hundred
x Note 1
o
o
o
o
Amusement buildings
x
x
o
o
x
Hotel-motel
Nineteen rooms or less
o
x Note 2
o
o
o
Three or more story*
x
x
o
o
o
Hotel-motel
Twenty rooms or more* and congregate
								residences
x
x Note 2
x
x
o
Commons area
Hotels-motels-apartment houses
X
X
X Note 3
Note 5
Educational
North Dakota Century Code Section 18-12-16
Institutional*
x
x
x
x
x
Office - High-rise
x
x
x
x
Apartments (see #2 above)
o
o
o
o
o
Industrial - Check with the local fire authority or the state
				  fire marshal Office building - Check with local jurisdiction
*State Department of Health rules.
Note 1. Placement of devices must be at exit on each
				  level.
Note 2. Detectors required in each sleeping room and one
				  detector for each seventy-five feet [22.86 meters] of hallway.
Note 3. When automatic sprinklers and flow detectors are
				  installed, they must be connected to the alarm system. Heat detectors are
				  required in mechanical rooms, laundry rooms, and storerooms.
Note 4. Institutional includes hospitals, nursing homes,
				  jails, and similar facilities, including any occupancy where movement is
				  restricted.
Note 5. If equipped with sprinkler.
Note 6. Emergency voice alarm and signal.
Note 7. One hundred or more sprinkler heads.
All signaling devices for all occupancies must meet Americans
				  with Disabilities Act (ADA) requirements (check ADA requirements).
Smoke detectors in hotels, motels, and apartments are not to
				  be tied to the central alarm system (alarm in room or apartment only).
Central alarm trouble indicator must be located where it will
				  be heard.
Systems with two or more zones must have an annunciator panel
				  located at an entrance approved by the local fire department.
Cities shall have additional or more stringent
				  requirements.
Be aware the table is the minimum and the owner or designer
				  shall ask for more.
General Authority:
NDCC 43-09-05
Law Implemented:
NDCC 43-09-21,
					 43-09-22