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Fireye General Reference Tables

NEMA Standard Classification Codes | Power and Heat | BTU Content of Fuels | Conversion to Symmetric Units | Conversion Factors for Boiler Ratings | Electric Motors Rating | Units of Pressure

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General Reference Tables

NEMA Standard Classification Codes for Flame Safety Control Enclosures

NEMA  1— General Purpose. For indoor protection, where conditions are not unusually severe.
NEMA  2— Driptight. Designed to exclude falling moisture or dirt. Particularly applicable to cooling rooms, laundries, etc., where condensation is prevalent. For indoor use.
NEMA  3— Weather Resistant (weatherproof). For outdoor use; designed to withstand all normal exposure to natural elements. Controls mounted on pullout racks for easy access. With rain hood and weather seals.
NEMA  4— Watertight. Withstands water pressure from l inch hose nozzle, 65 gallons per minute, from distance of not less than 10 feet for five minutes. Suitable for maritime applications, breweries, etc.
NEMA  5— Dust-tight. Equipped with dust-tight gaskets. Suitable for mills and other high-dust atmospheres.
NEMA  6— Submersible. For submerged operation under specified pressures and time.
NEMA  7— Hazardous Locations, National Electrical Code Class l (circuit breaks in air).
NEMA  8— Hazardous Locations, National Electrical Code Class l (circuit breaks immersed in oil).
NEMA  9— Hazardous Locations, National Electrical Code Class 2.
NEMA 10— Explosion-proof. Meets U.S. Bureau of Mines requirements for explosive atmospheres.
NEMA 11— Acid or Fume Resistant. Provides for immersion of enclosed equipment in oil.
NEMA 12— Industrial Use. Excludes oils, dust, moisture, to satisfy individual requirements.
 
POWER and HEAT
1 BTU
776 ft.-lb.
1 cal
0.003968 BTU Watt/hr.
1 BTU
0.293 Watt 4.2 cal/min.
1 Watt
3,413 BTU/hr
1 Watt-hr.
3.413 BTU/hr
1 kW (1000 Watts)
3413 BTU/hr
1 kW/hr.
3413 BTU/hr
1 hp
0.746 BTU 33,000 ft-lb./min.
1 bhp
9.809 kW 33,479 BTU/hr 34.5 lb. of steam per hour.
 
BTU CONTENT of FUELS
Grade or Type
Unit
BTU
No.1 Oil
Gallon
137,400
No.2 Oil
Gallon
139,600
No.3 Oil
Gallon
141,800
No.4 Oil
Gallon
145,100
No.5 Oil
Gallon
148,800
No.6 Oil
Gallon
152,400
Natural Gas
cu ft.
950 to 1,150
Propane
cu ft
2,550
Butane
cu ft
3,200
 


Conversion to Symmetric Units

Quantity
Standard Unit
SI Unit
SI Symbol
Multiplier to Convert from
Standard Unit to SI Unit
Temperature
Degrees Fahrenheit
Degrees Celsius
C
5/9 (F-32)
Length
Inches/Feet
Millimeters/meters
mm/m
25.4/0.3048
Capacity—Gas Valves
Cubic feet per hour
Cubic meters per hour
m 3 /hr
0.0283168
Control Valve Coefficient
C v a
k v b
k v
0.857
Fluid Capacity
Gallons per hour
Liters per second
 
0.001052
Heat
BTU per cubic foot
Megajoules per cubic meters
MJm 3
0.0671
Pressure Drop
Inch of water column
Kilopascals
kPa
0.2486
Pressure
Inch of mercury
Kilopascals
kPa
3.3741
Pressure
Pounds per square inch
Kilopascals
kPa
6.8948
Power (electric)
Horsepower
Watts/kilowatts
W/kW
746/0.746
Weight
Pounds
Kilograms
kg
0.4536
 

 

Conversion Factors for Boiler Ratings

1.
Boiler Horsepower
2.
33,475 BTU's per hour (output)
3.
34.5 lbs. steam per hour (from and at 210° F to 100° C.
4.
9810.6 watt (output)
5.
1 lb. steam per hour 970 BTU's per hour (output) (from 212° F or 100° C)
6.
284.3 watts (output)
 
Boiler
Horsepower
Pounds Steam
Per Hour
BTU/Hour
(Output)
Megawatts
Output
20
690
660,500
.20
40
1,380
1,339,000
.39
60
2,070
2,008,500
.59
80
2,760
2,678,000
.78
100
3,450
3,347.500
.98
150
5,200
5,021,250
1.47
200
6,900
6,695,000
1.96
250
8,600
8,368,750
2.45
300
10,500
10,042,500
2.94
 


Electric Motors Rating

Approximate
Horsepower
120V
240V
Full Load
Locked Rotor
Full Load
Locked Rotor
1/6 ac
dc
4,4
26.4
2.2
13.2
1/4 ac
dc
5.8
3.1
34.8
31.0
2.9
1.6
17.4
16.0
1/3 ac
dc
7.2
4.1
43.2
41.0
3.6
2.0
21.6
20.0
1/2 ac
dc
9.8
5.4
58.8
54.0
4.9
2.7
29.4
27.0
3/4 ac
dc
13.8
7.6
82.8
76.0
6.9
3.8
41.4
38.0
1 ac
dc
16.0
9.5
96.0
95.0
8.0
4.7
48.0
47.0
1 1/2 ac
dc
20.0
9.5
120.0
95.0
10.0
4.7
60.0
47.0
2 ac
dc
24.0
17.0
144.0
170.0
12.0
8.5
72.0
85.0
3 ac
dc
34.0
25.0
204.0
250.0
17.0
12.2
102.0
122.0
 


Units of Pressure

Known Pressure
Unit
Required Pressure Unit
Kilopascal
s
Pounds per
Sp. Inch
Ounces per
Sq. Inch
Millimeters
of Mercury
Kilograms
Sq. Inch
Inches of
Water
Inches of
Mercury
Feet of
Water
Centimeters
of Water
Centimeters of Water
0.0981
0.0142
0.227
0.735
0.000999
0.394
0.0289
0.0328
-
Feet of Water
2.99
0.433
6.94
22.4
0.0305
12.0
0.883
-
30.5
Inches of Mercury
0.249
0.0361
0.578
1.87
0.00254
-
0.0735
0.0833
2.54
Inches of Water
98.1
0.0361
0.578
735.0
-
394.0
29.0
32.8
1000.0
Kilograms/sq. inch
0.133
0.0193
0.308
-
0.00136
0.535
0.0394
0.0446
1.36
Millemeters of
Mercury
0.133
0.0193
0.308
-
0.00136
0.535
0.0394
0.0446
1.36
Ounces/sq. inch
0.431
0.0625
-
-8.24
0.00439
1.73
0.128
0.144
4.40
Pounds/sq. inch
6.89
-
16.0
51.7
0.0703
27.7
2.04
2.31
70.4
Kilopascals
-
0.145
2.32
7.52
0.010
4.02
0.295
0.334
10.2

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