EC&M’s Electrical Calculations Handbook - Chapter 11 pptx
EC&M’s Electrical Calculations Handbook - Chapter 11 pptx
... increase within the
312 Chapter Eleven
316 Chapter Eleven
Figure 1 1-3 Solve for minimum conduit size given wire insulation type, wire
size, and wire quantity.
Figure 1 1-2
Cross-sectional areas of ... so the cross-sec-
tional area available within each type of raceway for the
placement of conductors varies with the type of raceway.
Figure 1 1-2 on p. 315 shows the available cross-...
EC&M’s Electrical Calculations Handbook - Chapter 2 pptx
... Volt, 3-phase 4-wire wye Note 5
460 Volt, 3-phase 3-wire delta Note 4
600/347 Volt, 3-phase, 4-wire wye
2400 Volt, 3-phase, 3-wire delta
2400 Coltm 3-phase, 4-wire wye
4160/2400 Volt, 3-phase, 4-wire ... -j 104 = (180)
2
+ (104)
2
Minus Phase b voltage
- (120 120
°
= - 120 -6 0
°
)
= -( -1 20 COS 60 -j 120 SIN 60)
= -[ (-1 20)(5) -j (120)(.866)]
= -[ -6 0 +j 103.92]...
EC&M’s Electrical Calculations Handbook - Chapter 1 ppsx
... characteristics
4-2 2 Heat losses of a copper bar from its dimensions and
ampere load
8-1 Horizontal footcandle value using point method
4-1 1 Impedance of 600-V, 5-kV, and 15-kV copper cable
1-3 7 Impedance ... Selection 170
Chapter 5. Short-Circuit Calculations 179
Sources of Short-Circuit Current 182
The Ability of the Electrical Utility System to Produce
Short-Circuit C...
EC&M’s Electrical Calculations Handbook - Chapter 3 potx
... VECTOR
180 - 37.4° AMP
20.9
-1 6.6 +j 12.7
(-X, +J) (+X, +J)
(-X, -J) (+X, -J)
Step 3. Draw the resultant vector.
+X
+J
-J
(-X, -J)
NEW RESULTANT VECTOR
-1 6.6 +j 12.7
180
°
- 37.4
°
AMP
20.9
(-X, ... (0.576 -j 0.17) x (0.576 -j 0.17) = V; Solve for V.
2. Then, multiply scalars together and add angles.
V = (0.6 -1 6.4
°
) x (0.6 -1 6.4
°
)
V = (0.6 x 0.6) (-1 6.4
°
+...
EC&M’s Electrical Calculations Handbook - Chapter 4 potx
... 90
2 1-2 5 7 0-7 7 1.08 1.05 1.04
2 6-3 0 7 8-8 6 1 1 1
3 1-3 5 8 7-9 5 0.91 0.94 0.96
3 6-4 0 9 6-1 04 0.82 0.88 0.91
4 1-4 5 10 5-1 13 0.71 0.82 0.87
4 6-5 0 11 4-1 22 0.58 0.75 0.82
5 1-5 5 12 3-1 31 0.41 0.67 0.76
5 6-6 0 ... REMARKS
31 0-1 6 OR 31 0-1 7
31 0-1 6 OR 31 0-1 7 UNDERGROUND FEEDER CABLE
31 0-1 6 OR 31 0-1 7 MOISTURE AND HEAT RESISTA...
EC&M’s Electrical Calculations Handbook - Chapter 5 potx
... electrical systems against
damage during short-circuit conditions is required by the
National Electrical Code (Secs. 11 0-9 and 11 0-1 0).
Short-Circuit Calculations 181
For example, in a three-phase ... 30-MVA generator
3. The 5000-hp motor
4. The motors connected to the 480-V bus
Short-Circuit Calculations 191
Figure 5-1 Electrical power system one-line drawing for short...
EC&M’s Electrical Calculations Handbook - Chapter 6 pdf
... gen-
erator set manufacturer would be a set rated at 115 0 kW that
carries a kilovoltampere rating of 115 0/0.8, or 1437 kVA. If a
larger motor is to be started, then the kilovoltampere calcula-
tion ... power conductors and generator overcurrent pro-
200 Chapter Six
Gas-turbine generators arrive at the installation site prepackaged
on skids.
Figure 6-2
Solve for generator overcurrent...
EC&M’s Electrical Calculations Handbook - Chapter 7 potx
... such as a
460-volt (V), three-phase, three-wire delta system, an arc-
ing fault that repeatedly restrikes can cause voltage “jack-
ing” of up to six times the normal system phase-to-neutral
voltage. ... enough equipment-grounding conductors, as
shown in Fig. 7-4 .
Since system grounding is done at the service-disconnect-
ing means, the equipment-grounding conductor and the neu-
tral (“groun...
EC&M’s Electrical Calculations Handbook - Chapter 8 pps
... necessary to use the point-by-point method.
The Point-by-Point Method
How to make point-by-point calculations
Later in this chapter, lighting calculations within areas hav-
ing reflective surfaces, ... footcandles from the second luminaire.
Sample point-by-point lighting calculations
Refer to Fig. 8-1 for sample point-by-point lighting calcula-
tions for both the nadir point and a po...
EC&M’s Electrical Calculations Handbook - Chapter 9 docx
... coil.
272
260
Figure 9-1 0
Table replicating part of NEC Table 45 0-3 (a),
overcurrent protec-
tion of transformers over 600 V.
274
Figure 9-1 2
Table replicating part of NEC Table 45 0-3 (b),
overcurrent protec-
tion ... form, showing that in a wye-con-
nected system the phase-to-phase voltage is equal to the coil
voltage multiplied by the square root of 3.
Three-phase wye
Figure...