The Chinese University of Hong Kong Two Integrated Teaching Building Lightning Protection System Calculation Tower II
Length of Building Width of Building Height of Building Relative Structural Location Structural Coefficient Structural Contents Structural Occupancy Lightning Consequency
C1 C2 C3 C4 C5
Equivalent Collector Area Lightning Flash Density Maximum Lightning Flash Density Expected Direct Lightning Stroke Frequency on a Structure Accepted Direct Lightning Stroke Frequency on a Structure
Ae Ng Ng max Nd Nc
139337 0.042 0.083 0.029 0.022
E
0.243 Level III 14.7 60 5 45 89.4
Since
(m) (m) (m)
61.7 30 70.2 0.25 0.5 1 1 5
Nd > Nc , THE PROTECTION IS REQUIRED.
Effectiveness Protective Level Peak Current Initiation Distance Height of ESE Pole Selected Triggering Advance Protective Radius Thus, min. no. of ESE Poles required: 1
I D DT Rp
(kA) (m) (m) µs (m)
The Chinese University of Hong Kong Two Integrated Teaching Building Lightning Protection System Calculation Tower I
Length of Building Width of Building Height of Building Relative Structural Location Structural Coefficient Structural Contents Structural Occupancy Lightning Consequency
C1 C2 C3 C4 C5
Equivalent Collector Area Lightning Flash Density Maximum Lightning Flash Density Expected Direct Lightning Stroke Frequency on a Structure Accepted Direct Lightning Stroke Frequency on a Structure
Ae Ng Ng max Nd Nc
Since
(m) (m) (m)
90 60 82 0.25 0.5 1 1 5
### 0.042 0.083 0.040 0.022
Nd > Nc , THE PROTECTION IS REQUIRED.
Effectiveness Protective Level Peak Current Initiation Distance Height of ESE Pole Selected Triggering Advance Protective Radius Thus, min. no. of ESE Poles required: 1
E I D DT Rp
(kA) (m) (m) µs (m)
0.445 Level III 14.7 60 5 45 89.4
Peak Initiation Current I Distance (kA) D (m) E>0.98 Level I + Additonal Measures Level I 2.8 20 0.98≤E<0.95 Level II 9.5 45 0.80≤E<0.95 Level III 14.7 60 0≤E<0.80 Effectiveness E
1 2 3 4
Associated Protection Level