Step 9： Calculate the incident energy
1.
確定盤體尺寸修正係數。
2.
如果系統電壓為 600V < Voc ≤ 15000V，則使用公式（6）、公式（7）和公式（8）找到中間值。
利用公式(10)、(11)、(12)求電弧能量的最終值。
3.
如果系統電壓為 208V ≤ Voc ≤ 600V，則使用公式（9）確定最終電弧能量。
求中間值
(6)
(7)
(8)
(9)
where
E600 is the incident energy at Voc = 600 V (J/cm2)
E2700 is the incident energy at Voc = 2700 V (J/cm2)
E14300 is the incident energy at Voc = 14 300 V (J/cm2)
E≤600 is the incident energy for Voc ≤ 600 V (J/cm2)
T： the arc duration (ms)
G：the gap distance between conductors (electrodes) (mm)
Iarc_600： the rms arcing current for 600 V (kA)
Iarc_2700： the rms arcing current for 2700 V (kA)
Iarc_14300： the rms arcing current for 14 300 V (kA)
Iarc：rms arcing current for Voc ≤ 600 V [using Equation (25)] (kA)
Ibf： bolted fault current for three-phase faults (symmetrical rms) (kA)
D： the distance between electrodes and calorimeters (working distance) (mm)
CF： correction factor for enclosure size (CF = 1 for VOA and HOA confi.)
lg： log10
k1to k13： the coefficients provided in Table 4, Table 5, and Table 6.
Table 4 Coefficients for Equation (6), Equation (9), Equation (13), and Equation (16)
Table 5 Coefficients for Equation (7), Equation (14)Table 6 Coefficients for Equation (8), Equation (15)
求最終值 (600 V < Voc ≤ 15000 V)
(10)
(11)
(12)
where
E1： the first E interpolation term between 600 V and 2700 V (J/cm2)
E2： the second E interpolation term used when Voc is > 2700 V (J/cm2)
E3： the third E interpolation term used when Voc is < 2700 V (J/cm2)
When 0.600 < Voc ≤ 2.7, the final values of incident energy is given as follows：
E = E3
When Voc > 2.7, the final values of incident energy is given as follows：
E = E2
求最終值 (Voc ≤ 600 V)
電弧能量如下：
E = E≤600
where
E≤600： the incident energy for Voc ≤ 600 V determined using Equation (9) solved using the arc current determined from Equation (1) and Equation (5) (J/cm2)
E： the final incident energy at specified Voc (J/cm2)
Step 10： 決定所有設備的電弧保護界線
1.
確定盤體尺寸修正係數
2.
如果系統電壓為 600V < Voc ≤ 15000V，則使用公式（13）、（14）及（15）來找出中 間值。
利用公式(17)、(18)、(19)求電弧保護界線的最終值。
3.
如果系統電壓為 208V ≤ Voc ≤ 600V，則使用公式（16）確定最終的電弧保護界線。
求中間值
(14)
(15)
where
AFB600： the arc-flash boundary for Voc = 600 V (mm)
AFB2700： the arc-flash boundary for Voc = 2700 V (mm)
AFB14300： the arc-flash boundary for Voc = 14 300 V (mm)
AFB≤600： the arc-flash boundary for Voc ≤ 600 V (mm)
G： the gap between electrodes (mm)
Iarc_600： the rms arcing current for 600 V (kA)
Iarc_2700： the rms arcing current for 2700 V (kA)
Iarc_14300： the rms arcing current for 14 300 V (kA)
Iarc： the rms arcing current for Voc ≤ 600 V [obtained using Equation (5)] (kA)
Ibf： the bolted fault current for three-phase faults (symmetrical rms) (kA)
CF：the correction factor for enclosure size (CF=1 for VOA and HOA configurations)
T：the arc duration (ms)
lg： log10
k1 to k13： are the coefficients provided in Table 4, Table 5, and Table 6.
求最終值 (600 V < Voc ≤ 15000 V)
(17)
(18)
(19)
where
AFB1： the first AFB interpolation term between 600 V and 2700 V (mm)
AFB2： the second AFB interpolation term used when Voc is > 2700 V (mm)
AFB3： the third AFB interpolation term used when Voc is < 2700 V (mm)
When 0.600 < Voc ≤ 2.7, the final values of arc-flash boundary are as follows：
AFB = AFB3
When Voc > 2.7, the final values of arc-flash boundary are given as follows：
AFB = AFB2
求最終值 (Voc ≤ 600 V)
電弧保護界線如下：
AFB = AFB≤600
where
AFB≤600：arc-flash boundary for Voc ≤ 600V determined using Equation(16) solved using the arc current determined from Equation (1) and Equation (5) (mm)
AFB：the final arc-flash boundary at specified Voc (mm)
Step 11： 決定二次電弧電流
必須考慮電弧電流的變化，減少的電弧電流重複步驟 8、步驟 9 和步驟 10。其獲得的電弧能量和電弧保護界限之結果可能不同。
最終電弧能量或電弧保護界限是兩個計算值中較高的一個。
(20) where
VarCf： the arcing current variation correction factor
Iarc：the final or intermediate rms arcing current(s) (kA) (see note)
Iarc_min： a second rms arcing current reduced based on the variation correction factor (kA)
Voc： the open-circuit voltage between 0.208 kV and 15.0 kV
k1 to k7： the coefficients provided in Table 7
Table 7 Coefficients for Equation (20)
NOTE—The correction factor (1 – (0.5 × VarCf)) is applied as follows：
— 208 V ≤ Voc ≤ 600 V： To Iarc (final current only)
— 600 V < Voc ≤ 15000 V： To Iarc_600, Iarc_2700, and Iarc_14300 (intermediate average arcing currents). The final Iarc value inherits the correction factor.
“0.5”係數表示應用平均電弧電流變化以求得電弧電流下限值。
