How should we arrange lightning protection in a single-family house?

How should we arrange lightning protection in a single-family house?

How do we arrange lightning protection in a private house? 
Let's look at one example. A couple of days ago the experts from calculated lightning protection at the client's request. We are glad to share these calculations with you!

Parameters of the object:

  • Structure length: 12 m;
  • Width: 13.5 m;
  • Height: 10 m.
  • Roofing material: composite tile (multilayer coating based on steel sheet 0.5 mm thick).
  • Cladding: brick.
  • On the roof there are two chimneys: 20-30 cm above the roof level.
  • The distance from the wall to the roof projection: 50-60 cm.
  • A gutter is positioned along the roofing perimeter, and there are 6 down pipes in the corners of the building. The gutters and pipes are plastic.
  • The soil in the site is loamy.
  • There are no high buildings nearby.

Lightning protection was calculated in accordance with Electrical Installation Code 7th rev. Chapter 1.7. CO 153-34.21.122-2003 "Instructions for lightning protection of buildings, structures and industrial communications" (hereinafter CO) and RD 34.21.122-87 "Instructions for lightning protection of buildings and structures" (hereinafter RD).

According to CO 153-34.21.122-2003, the house is an ordinary building in terms of lightning protection. And according to RD 34.21.122-87 , this house refers to Class 3. Based on these data, lightning protection of this house requires lightning rods. A lightning rod is a device rising above the protected facility to divert the lightning current into the soil without entering the protected facility. The device contains the following components: air terminal, down conductor and earthing electrode.

Measures for lightning protection of the house:

  1. Installation of two lightning rods rods, each 4 m high, both fixed to chimneys.
  2. Two down conductors with copper-clad wire D = 8 mm. The lightning rods are also interconnected to arrange two down conductors from each lightning rod. The down conductors should be located no closer than 3 m from entrances or in places where people cannot touch them. The down conductors are fixed on the roof with GL-11747A clips. The down conductors are fixed to the water pipes with GL-11514 clips. The down conductors are fixed to the chimneys with GL-11704A clips.  GL-11551A clips are used to connect and branch the down conductors.
  3. Installation of the grounding device, consisting of three vertical electrodes (copper-clad pins 14 mm in diameter, 3 m long, jointed with a horizontal electrode (copper-clad stripe 30x4 mm). The distance between the vertical electrodes is at least 5 meters, the distance from the horizontal electrode to the building walls is 1 m, the depth is 0.5 m.
  4. The down conductor is connected with the copper-clad stripe protruding from the ground with GL-11562A clip.

Protection area and layout of lightning protection elements
Protection area and layout of lightning protection elements

Equipment for lightning protection

Image Product item Product name Quantity
  GL-21103G GALMAR Vertical lightning rod (mast) (4 meters) 2
GL-21202 GL-21202 GALMAR Holder for mast lightning rod GL-21103G fixed to the chimney (stainless steel) 2
GL-20022 GL-20022 GALMAR Clip for mast lightning rod for down conductors (stainless steel) 2
GL-11149-50 GL-11149-50 Copper-clad steel wire GALMAR (D8 mm; 50 meters coil) 1
GL-11551A GL-11551A GALMAR Clip for connection of down conductors (painted galvanized steel) 3
GL-11747A GL-11747A GALMAR Clip for the roof covered with metal profile / corrugated board for down conductors (painted galvanized steel) 30
GL-11514 GL-11514 GALMAR Clip for the drain pipe to fix the down conductor (tin-plated copper + tin-plated brass) 14
GL-11704A GL-11704A GALMAR Clip for fixing to the building face for the down conductor (painted galvanized steel) 3
GL-11562A GL-11562A GALMAR Control clip for connection of down conductors, wire + stripe (painted galvanized steel) 2
ZZ-005-064 ZZ-005-064 ZANDZ Clip for conductor connection    (up to 40 mm) 3
ZZ-001-065 ZZ-001-065 ZANDZ Copper-clad threaded grounding rod (D14; 1,5 m) 6
ZZ-002-061 ZZ-002-061 ZANDZ Pipe coupling 4
ZZ-003-061 ZZ-003-061 ZANDZ Starting cap 3
ZZ-004-060 ZZ-004-060 ZANDZ Guiding head for the hammer driving header 2
ZZ-006-000 ZZ-006-000 ZANDZ Conductive grease 1
ZZ-007-030 ZZ-007-030 ZANDZ Waterproof band 1
ZZ-008-000 ZZ-008-000 ZANDZ Breaker hammer head (SDS max) 1
GL-11075-50 GL-11075-50 GALMAR Copper-clad stripe (30 * 4 mm / S 120 mm²; 50 meters coil)  1

Send us your questions on calculations of grounding and lightning protection. Technicians from ZANDZ are happy to answer them. You will find our contacts here

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