Page 79 - 35_DS702_E_2014_Lightning_Protection_Guide

air-termination tip
Parallel conector conductor holder with
St/tZn Part No. 307 000 loose conductor routing
Roof conductor holder
for metal roofs,
loose conductor routing,
DEHNgrip conductor holder bridging braid
StSt Part No. 223 011
Al Part No. 223 041
Roof conductor holder KS connector
for metal roofs, capable of
carrying lightning currents,
fixed conductor routing,
with clamping frame
StSt Part No. 223 010
Al Part No. 223 040
roof connection

bridging cable

Figure 5.1.4.4a Conductor holders for metal roofs – Round standing seam Figure 5.1.4.4b Conductor holder for metal roofs –
Round standing seam

Figure 5.1.4.5 Sample construction o a trap- Figure 5.1.4.6 Sample construction on a Figure 5.1.4.7 Air-termination rod for a dome-
ezoidal sheet roof, conductor standing seam roof light on a round standing seam
holder with clamping frame roof

Figure 5.1.4.6 shows a conductor holder with loose conduc- 5.1.5 Air-termination system for buildings
tor routing on a standing seam roof. with thatched roof
Figure 5.1.4.6 also shows the current carrying connection to
the standing seam roof at the edge of the roof. Unprotected In general, class of LPS III is suited for such a structure. In indi-
installations protruding above the roof such as domelights vidual cases, a risk analysis based on IEC 62305-2 (EN 62305-2)
and smoke vents are exposed to lightning strikes. In order to can be performed.
prevent these installations from being struck by direct light- Section 4.3 of Supplement 2 of the German DIN EN 62305-3
ning strikes, air-termination rods must be installed next to the standard places special requirements on the installation of the
installations protruding above the roof (Figure 5.1.4.7). The air-termination system for buildings with thatched roof.
height of the air- termination rod depends on the protective The air-termination conductors on such roofs made of thatch,
angle α. straw or reed must be fastened across insulating supports so

78 LIGHTNING PROTECTION GUIDE www.dehn-international.com