Page 473 - 35_DS702_E_2014_Lightning_Protection_Guide

Figure 9.34.3 Mobile lightning protection for a yacht with a metal mast . 452 Table 3.2.6.1 Risk components for different points of strike (sources of
Figure 9.34.4 Use of an isolation transformer to prevent corrosion. . . . 453 damage) and types of damage . . . . . . . . . . . . . . . 45
Figure 9.34.5 Basic surge protection for a yacht (observe the technical Table 3.2.7.1 Typical values for the tolerable risk R T . . . . . . . . . . . 45
data of the manufacturer of the surge protective devices) . 454 Table 3.2.8.1 Lightning and surge protection measures and their
Figure 9.34.6 Detailed view of the shoreside power supply system with influences on the individual risk components . . . . . . . 47
a lightning current carrying type 1 combined arrester . . . 455 Table 3.2.9.1 Values for assessing the total value c t (EN 62305-2) . . . . 48
Table 3.2.9.2 Portions to assess the values c a , c b , c c , c s (EN 62305-2) . . 48
Table 1.1.1 Lightning protection standards valid since December 2010. . 9 Table 3.3.1.1 DEHN Risk Tool, measures (excerpt) . . . . . . . . . . . . 52
Table 1.1.2 Supplements to the German DIN EN 62305 standard . . . . 9 Table 3.4.1.1 Maximum period between inspections of an LPS according
Table 2.5.1 Temperature rise ΔT in K of different conductor materials . 22 to Table E.2 of IEC 62305-3 (EN 62305-3) . . . . . . . . . 56
Table 2.6.1 Maximum lightning current parameters and wave forms Table 5.1.1.1 Relation between lightning protection level, interception
for the different lightning current components. . . . . . . 23 probability, final striking distance h B and minimum peak
value of current I; source: Table 5 of IEC 62305-1
Table 2.7.1 Maximum lightning current parameter values and their (EN 62305-1) . . . . . . . . . . . . . . . . . . . . . . . . 65
probabilities . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 5.1.1.2 Sag of the rolling sphere in case of two air-termination
Table 2.7.2 Minimum lightning current parameter values and their rods or two parallel air-termination conductors . . . . . . 67
probabilities . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 5.1.1.3 Mesh size. . . . . . . . . . . . . . . . . . . . . . . . . . 68
Table 3.2.1.1 Sources of damage, types of damage and types of loss
depending on the point of strike . . . . . . . . . . . . . . 32 Table 5.1.1.4 Protective angle α depending on the class of LPS . . . . . 70
Table 3.2.3.1 Location factor C D . . . . . . . . . . . . . . . . . . . . . 35 Table 5.1.1.5 Minimum thickness of sheet metal . . . . . . . . . . . . 72
Table 3.2.3.2 Installation factor C I . . . . . . . . . . . . . . . . . . . . 35 Table 5.1.4.1 Lightning protection for metal roofs – Height of the air-
termination tips . . . . . . . . . . . . . . . . . . . . . . 77
Table 3.2.3.3 Line type factor C T . . . . . . . . . . . . . . . . . . . . . 35
Table 3.2.3.4 Environmental factor C E . . . . . . . . . . . . . . . . . . 35 Table 5.2.1.1 Distances between down conductors according to
IEC 62305-3 (EN 62305-3) . . . . . . . . . . . . . . . . . 95
Table 3.2.4.1 Values of probability P TA that a lightning strike to a
structure will cause electric shock to living beings due Table 5.2.2.1 Maximum temperature rise ΔT in K of different conductor
to dangerous touch and step voltages . . . . . . . . . . . 37 materials . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Table 3.2.4.2 Probability of damage P B describing the protection Table 5.2.4.1 Parameters of a HVI Conductor. . . . . . . . . . . . . . . 103
measures against physical damage. . . . . . . . . . . . . 37 Table 5.3.1 Material, configuration and minimum cross-sectional area
Table 3.2.4.3 Probability of damage P SPD describing the protection of air-termination conductors, air-termination rods, earth
a)
measure “coordinated surge protection” depending on entry rods and down conductors according to Table 6
the lightning protection level (LPL) . . . . . . . . . . . . . 37 of IEC 62305-3 (EN 62305-3). . . . . . . . . . . . . . . . 110
Table 3.2.4.4 Values of factors C LD and C LI depending on shielding, Table 5.4.1 Material combinations . . . . . . . . . . . . . . . . . . . 112
earthing and insulation conditions . . . . . . . . . . . . . 38 Table 5.4.1.1 Calculation of the temperature-related change in length
Table 3.2.4.5 Value of the factor K S3 depending on internal wiring. . . . 39 ΔL of metal wires for lightning protection systems. . . . . 112
Table 3.2.4.6 Values of probability P TU that a flash to an entering line Table 5.4.1.2 Expansion pieces in lightning protection – Recommended
will cause electric shock to living beings due to dangerous application . . . . . . . . . . . . . . . . . . . . . . . . . 112
touch voltages . . . . . . . . . . . . . . . . . . . . . . . 39 Table 5.4.2.1a Components for the external lightning protection system
Table 3.2.4.7 Probability of damage P EB describing the protection of an industrial building . . . . . . . . . . . . . . . . . . 113
measure “lightning equipotential bonding” depending Table 5.4.2.1b Components for the external lightning protection system
on lightning protection level (LPL) . . . . . . . . . . . . . 39 of a residential building . . . . . . . . . . . . . . . . . . 114
Table 3.2.4.8 Values of the probability P LD depending on the resistance Table 5.5.1 Formulas for calculating the earth resistance R A for
of the cable shield R S and the impulse withstand voltage different earth electrodes. . . . . . . . . . . . . . . . . . 123
U W of the equipment . . . . . . . . . . . . . . . . . . . . 40
Table 5.5.7.2.1 Potential values and corrosion rates of common metal
Table 3.2.4.9 Values of the probability P LI depending on the line type materials (according to Table 2 of the German VDE 0151
and the impulse withstand voltage U W of the equipment . 40 standard) . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Table 3.2.5.1 Values of the reduction factor r t depending on the type Table 5.5.7.4.1 Material combinations of earth-termination systems for
of surface of the ground or floor . . . . . . . . . . . . . . 41 different area ratios (A C > 100 x A A ) . . . . . . . . . . . . 147
Table 3.2.5.2 Values of the reduction factor r p depending on the Table 5.5.8.1 Material, configuration and minimum dimensions of
measures taken to reduce the consequences of fire . . . . 41 earth electrodes a) e) according to Table 7 of IEC 62305-3
Table 3.2.5.3 Values of the reduction factor r f depending on the risk (EN 62305-3) . . . . . . . . . . . . . . . . . . . . . . . . 148
of fire of a structure . . . . . . . . . . . . . . . . . . . . 41 Table 5.6.1 Induction factor k i . . . . . . . . . . . . . . . . . . . . . 150
Table 3.2.5.4 Values of the factor h z which increases the relative value Table 5.6.2 Partitioning coefficient k c , simplified approach. . . . . . . 151
of a loss for type of loss L1 (loss of human life) in case
of a special risk. . . . . . . . . . . . . . . . . . . . . . . 41 Table 5.7.1 Ring distances and potential control depths . . . . . . . . 156
Table 3.2.5.5 Type of loss L1: Typical mean values for L T , L F and L O . . . . 42 Table 5.7.2.1 Step / body voltage limit values according to different
sources . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
Table 3.2.5.6 Type of loss L2: Typical mean values for L F and L O . . . . . 43
Table 5.7.2.2 Simulation results with and without consideration of the
Table 3.2.5.7 Type of loss L3: Typical mean values for L F . . . . . . . . . 43 reaction of the human body to the step voltage . . . . . . 163
Table 3.2.5.8 Type of loss L4: Relevant values depending on the type Table 5.8.1 Possible material combinations of air-termination systems
of loss . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 and down conductors with one another and with structural
Table 3.2.5.9 Type of loss L4: Typical mean values for L T , L F and L O . . . 44 parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165

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