5.4.2 External lightning protectionsystem for a residential house
Fig. 5.4.2.1 illustrates the design of theexternal lightning protection system fora residential house with attachedgarage.Fig. 5.4.2.1 and Table 5.4.2.1 show exam-ples of the components in use today. No account is taken of the measuresrequired for an internal lightning protec-tion system such as lightning equipoten-tial bonding and surge protection (seealso Chapter 6).
Particular attention is drawn to DEHN’sDEHNsnap and DEHNgrip programme ofholders.The DEHNsnap generation of syntheticholders (Fig. 5.4.2.2) is suitable as a basiccomponent (roof and wall). The cap sim-ply snaps in to fix the conductor in theholder while still being loosely guided.The special snap-in technique exerts nomechanical load on the fastening.DEHNgrip (Fig. 5.4.2.2) is a screwlessstainless steel system of holders whichwas put into the programme to supple-ment the DEHNsnap system of syntheticholders.
This screwless system of holders can alsobe used as both a roof and a wall con-ductor holder for Ø8 mm conductors.Simply press in the conductors and theconductor is fixed in DEHNgrip (Fig. 5.4.2.2).
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Fig. 5.4.2.1 External lightning protection of a residential building
4
5
3
11
7
2
6 8
1213
10
1
15
9
14
16
20
21
19
1718
base part
cap
DEHNgripconductor holder
DEHNsnapconductor holder
Fig. 5.4.2.2 DEHNsnap und DEHNgrip conductor holders
Pos. in Part description Part No.Fig. 5.4.2.1
Bridging bracket made of aluminium 377 006
Bridging braid made of aluminium 377 015
Lead-in earthing rod Ø16 mm 480 150complete 480 175
Rod holder with flange 275 116275 260
Parallel connector 305 000306 020
Cross unit 319 201SV clamps made of St/tZn 308 220SV clamps made of StSt 308 229
Rod holder with cleat and flange 275 260for heat insulation 273 730
Number plate for 480 006marking isolating points 480 005
Air-termination rod with forged tab 100 075with rounded ends 483 075
Rod clamp 380 020
Rod holder with tip 262 130
Earth rod St/tZn 620 150sectional unit with bolt 625 150and hole 620 151
625 151
Impact tip for deep-driven 620 001earth rods 625 001
Connecting clamp for earth rods 620 011unilateral 625 011
for earth rods 620 015625 015
21
20
19
18
17
16
15
14
13
12
11
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Pos. in Part description Part No.Fig. 5.4.2.1
Round conductor Ø8 mm – 840 008DEHNALU, medium-hard, 840 018soft-twistable
Steel strip 30 x 3.5 mm – St/tZn 810 335
Round conductor Ø10 mm – 860 010StSt V4A
Roof conductor holders 202 020for ridge and hip tiles 204 109
204 249204 269206 109206 239
Roof conductor holders 204 149for conductors within 204 179roof surfaces 202 010
202 050202 080206 209206 309
DEHNsnap 204 006DEHNgrip 207 009conductor holder
with cleat and flange 275 160for heat insulation 273 740
Gutter clamp for beads 339 050made of stainless steel 339 059
Single-screw gutter glamp 339 100made of stainless steel 339 109
MV clamp made of Al 390 050MV clamp made of StSt 390 059
Gutter board clamp 343 000
Downpipe clampadjustable for Ø60-150 mm 423 020for any cross sections 423 200
KS connector for connecting conductors 301 000made of StSt 301 009
MV clamp 390 05110
9
8
7
6
5
4
3
2
1
Table 5.4.2.1 Components for external lightning protection of a residential builiding
5.4.3 Application tips for mountingroof conductor holders
Ridge and hip tiles:Adjust roof conductor holders withadjusting screw to suit the dimension ofthe ridge tile (Fig. 5.4.3.1).
The conductor leading can, in addition,be gradually adjusted by means of con-ductor holders from the top centre to thebottom side.(conductor holder can be loosened byeither turning the holder or opening thefixing screw.)
SPANNsnap roof conductor holder withDEHNsnap synthetic conductor holder orDEHNgrip stainless steel conductor hold-er (Fig. 5.4.3.2).
Permanent tension due to stainless steeltension spring. Universal tension rangefrom 180-280 mm with laterallyadjustable conductor leading for Rd8 mm conductors.
FIRSTsnap conductor holder with DEHN-snap synthetic conductor holder for put-ting on existing ridge clamps for dryridges.
For dry ridges, the DEHNsnap conductorholder (1) (Fig. 5.4.3.3) is put on the ridgeclamp already on the structure (2) andtightened manually (only turn DEHN-snap).
Grooved pantiles:The roof conductor holder with pre-formed struts is used for the roof sur-faces. The conductor holder is bent byhand before being hooked into the bat-tens. Additionally, it can also be securedwith nails (Fig. 5.4.3.4).
Smooth tiles (Fig. 5.4.3.5):
Slate roofs:When using it on slate roofs, the internalhook system is bent (Fig. 5.4.3.6) orequipped with a supplementary clamp(Part No. 204 089).
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Fig. 5.4.3.1 Conductor holder with DEHNsnap forridge tiles
Fig. 5.4.3.2 SPANNsnap with plastic DEHNsnap con-ductor holder
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Fig. 5.4.3.3 FIRSTsnap for mounting on existing rid-ge clamps
angled by hand
Fig. 5.4.3.4 Roof conductor holder with preformedbrace - Used on grooved pantiles
Fig. 5.4.3.5 Roof conductor holder with preformedbrace - Used on smooth tiles,e.g. plain tiles
angle the inner latchingfor use on slate roofs
Fig. 5.4.3.6 Roof conductor holder with preformedbrace - Used on slate roofs
Grooved tiles:FLEXIsnap roof conductor holder forgrooved tiles, for direct fitting on thegroove (Fig. 5.4.3.7).
The flexible stainless steel strut is pushedbetween the grooved tiles.By pressing on the top grooved tile, thestainless steel strut is deformed andadapts itself to the shape of the groove.Thus it is fixed tightly under the tile.This application with an aluminium strutmakes it easy to adapt to the shape ofthe groove.A notch is provided for an eventuallyexisting window hook.The strut of the holder can also be naileddown (holes in the strut).
Roof conductor holders with preformedstrut, for hooking into the bottomgroove for pantile roofs (Fig. 5.4.3.8).
Flat tiles or slabs:DEHNsnap conductor holder (1)(Fig. 5.4.3.9) and its clamping device (2) ispushed in between the flat tiles (3) (e. g.plain tile) or slabs and tightened manual-ly (only turn DEHNsnap).
Overlapped constructions:In case of overlapped constructions (3)(e. g. slabs and natural slates), DEHNsnapconductor holder (1) (Fig. 5.4.3.10) withclamping terminals (2) is pushed on fromthe side and secured with a screw driverwhen the holder is open.For slabs laid on a slant, DEHNsnap canalso be turned to allow a plumb conduct-or leading.
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insert the holderunderneath
lift tile
press tileon it
Fig. 5.4.3.7 Conductor holder for direct fitting on theseams
insert the holderunderneath
lift tile
press tileon it
Fig. 5.4.3.8 Roof conductor holder for hanging intothe bottom seam of pantile roofs
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Fig. 5.4.3.9 ZIEGELsnap, for fixing between flat tilesor plates
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Fig. 5.4.3.10 PLATTENsnap roof conductor holderfor overlapped constructions
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