Lightning Protection and Grounding for a Reproduction Health Center in the Voronezh Region

The ZANDZ Technical Center has received a request to calculate the lightning protection and grounding system for the reproduction health center in the Voronezh Region.

Lightning protection and grounding for a reproduction health center

Let's consider the solution offered by our specialists.


Initial data:

  • facility: a reproduction health center;

  • dimensions: 56.3 x 17.1 x 22.6 m;

  • soil resistivity: 100 Ohm*m.



  • calculate the lightning protection system;

  • calculate the grounding device.




Lightning protection and grounding of the building are made in accordance with:


The facility is classified as “conventional” from the viewpoint of SO and as Category III of the lightning protection according to RD.


A set of measures to provide necessary requirements to the lightning protection and grounding system for the reproduction health center includes the following solutions:

1. The facility lightning protection is performed using the lightning grid made of a steel copper-plated wire d8 mm. Grid step is at least 10 m. A grid is made using a steel zinc-plated wire d8 mm (ZZ-502-008).

2. Metal caps should be provided on all air shafts that will function as natural lightning arresters.

3. Steel zinc-plated wire d8 mm (ZZ-502-008) is used as a current collector.

4. Current collectors are connected by horizontal bands near the ground and each 20 m along the building's height according to SO 153-34.21.122-2003, item

5. Current collectors are installed using clamp ZZ-202-015 on the roof and GL-11703A on ramparts and vertical surfaces. The clamp installation step is 0.8 to 1.0 m.

6. The multifunctional GL 11551A clamp is used to connect the rolled products over the length and in assemblies.

5. All metal elements located on the roof must be connected to the down conductor using GL-11545A clamps. Stairs, railings, are attached using the GL 11514N ring clamp.

8. 3 m steel zinc-plated electrodes in the points of downdrop connections are used as vertical ground electrodes. A galvanized steel strip with a cross-section of 30x4 mm, combining all vertical electrodes is used as a horizontal ground electrode. The distance to the facility foundation is at least 1 m. Strip deepening is 0.5 to 0.7 m.

9. According to EIC-7 issue, item 1.7.55, Grounding devices for protective grounding of electrical installations for buildings and structures and the 2nd and 3rd categories lightning protection of these buildings and structures usually should be common.

10. If there are reinforced concrete structures, they should be connected to current collectors or to the grounding device.

11. Connection to current collectors is performed with the step not more than 20-25 m using clamps ZZ-005-064.


Ground terminal resistance calculation:

Vertical electrode resistance:

Vertical grounding calculation

Верт - Vert
Экв - Eq
Ом - Ohm

where    ρρeq – is equivalent soil resistivity, 100 Ohm·m;

L – is vertical electrode length, 3 m;

d – is vertical electrode diameter, 0.016 m;

T – is depth, i.e. the distance from the ground surface to the ground electrode, 2 m;

Grounding electrode depth

м - m

where     t  – is deepening of the top of the electrode, 0.5 m.


Horizontal electrode resistance:

Calculation of horizontal grounding electrode

Гор - Hor
Ом - Ohm

where    ρ – is soil resistivity, 100 Ohm·m;

b - is horizontal electrode width, 0.03 m;

h - is horizontal electrode depth, 0.7 m;

Lгор – is horizontal electrode length, 164 m.


Electrical impedance of the grounding arrangement:

Calculation of impedance of a grounding arrangement

Ом - Ohm

where n – is a number of sets, vertical grounding arrangements - 9 pcs, horizontal grounding arrangement - 1 pc;

Kutil – is utilization rate, 0.63


The calculated resistance of the grounding arrangement is 1,64 Ohm.


The location of the equipment is shown in Figure 1.

Lightning protection and grounding of the reproduction health center

Условные обозначения - Legend
- проволока стальная оцинкованная диаметром 8 мм - d8 mm steel zinc-plated wire
- полоса стальная оцинкованная сечением 30х4 мм - steel zinc-plated bar 30 x 4 mm
- универсальный зажим-соединитель для проволоки - multipurpose clamp for wire
- зажим для подключения проводника - clamp for connecting wire
- опуск токоотвода - downdrop
- вертикальный заземлитель длиной 3 м - 3 m vertical grounding arrangement

Figure 1. Equipment layout.


The list of necessary materials is given in Table 1.


Table 1. List of needed materials.

№ п/п Part number Name Quantity, pcs. Unit weight, kg Note
1. ZZ-502-008-125 ZANDZ Galvanized steel wire (D 8 mm/ S 50 mm²; wire bundle 125 m) 5 0,39 Вес 1 метра
2. GL-11545A GALMAR Main conductor rain water gutter terminal (painted galvanized steel) 10 0,112  
3. GL-11551A GALMAR Conductor connection clamp (painted zinc-plated steel) 80 0,07  
4. ZZ-202-015 ZANDZ Holder for a circular conductor on a flat roof (D 8 mm; plastic + concrete) 600 1,00  
5. GL-11703A GALMAR Current collector facade clamp providing 15 mm elevation of the collector over the clamp (painted zinc-plated steel) 260 0,02  
6. GL-11514N GALMAR Ring clamp on rainwater pipe for current collector (tinned copper) 10 0,076  
7. ZZ-502-304-52 ZANDZ Steel zinc-plated bar (30 * 4 mm; 52 m bundle) 4 0,96 Вес 1 метра
8. ZZ-001-255 ZANDZ Threaded zinc-plated grounding rod (D16; 1.5 m; M16) 18 2,00  
9. ZZ-002-251 ZANDZ Threaded zinc-plated connection coupling (M16) 10 0,08  
10. ZZ-003-250 ZANDZ Termination for zinc-plated grounding rods (M16; zinc-plated steel) 9 0,07  
11. ZZ-004-250 ZANDZ Guide head for jackhammer attachment (M16; zinc-plated steel) 4 0,09  
12. ZZ-005-064 ZANDZ Conductor connection terminal (up to 40 mm) 25 0,312  
13. ZZ-006-000 ZANDZ Conductive grease 2 0,10  
14. ZZ-007-030 ZANDZ Waterproofing tape 9 0,40  
15. ZZ-008-000 ZANDZ Attachment to the hammer (SDS max) 1 0,50  

Do you have any questions regarding lightning protection and grounding for the reproduction health center? Please contact the ZANDZ Technical Center!

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