Lightning Protection of an Arch Framed and Tent Hangar in the Khanty-Mansi Autonomous District

The ZANDZ Technical Center has received a request to calculate the lightning protection system and grounding arrangement for an arch framed and tent hangar. Let's consider the solution proposed by our engineers.

Lightning protection of arch frame and tent hangar

Calculation data:

  1. Facility: arch framed and tent hangar.

  2. Protected facility dimensions: 40 x 24 x 10 m.

  3. The soil resistivity accepted for calculations is 1000 Ohm * m.



1. Calculate the lightning protection system.

2. Calculate the grounding arrangement.


The activities have been performed according to:

- EIC, Rev. 7. Electrical Installations Code (hereinafter referred to as the EIC);

- SO 153-34.21.122-2003 Instructions for Mounting Lightning Protection for Buildings, Structures, and Industrial Utilities (hereinafter referred to as SO);

- RD 34.21.122-87 Instructions for Mounting Lightning Protection for Buildings and Structures (hereinafter referred to as RD).


The facility is classified as "conventional" according to SO and as Category 3 according to RD.


A set of arrangements ensuring compliance with the lightning protection requirements is based on the following solutions:

  1. Lightning protection for the facility is made using the lightning arresters with the height 16 m (ZZ-201-016-В7-Сн5-С9), which are installed at the distance of 3 m from the protected facility.

  2. Metal structures of the facility are attached to the grounding arrangement every 15 to 20 m.

  3. As vertical electrodes, electrolytic grounding sets ZZ-100-102 are used, which are installed near lightning arresters at the distance of at least 3 m from foundations.

  4. The copper-plated steel strip with a cross-section of 30 x 4 mm, connecting 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.

  5. According to EIC-7 issue, par.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, as a rule, shall be common.

  6. If there are concrete-steel constructions, they shall be connected to down conductors/grounding device.

  7. Connection to the grounding device is carried out using ZZ-005-064 clamps.


The results of calculation of protection zones according to SO:

h = 16 m;

Cone height according to SO, Table 3.4:

h0 = 0,85h = 13,6 m;

Cone radius according to SO, Table 3.4:

r0 = 1,2h = 19,2 m;

To provide the protection zone with the required reliability, radius rx at the height hх =10 m is determined as follows:

Protection zone radius

Distance between the lightning arresters (maximum):

L = 46 m;

Limit distance between lightning arresters according to SO, Table 3.6:

Limit distances between lightning arresters

м - m

Sagging height:

Slag height of the protection zone

To provide protection with the required reliability, radius rcx at the height h0 10 m is determined as follows:

Protection zone radius between arresters


Ground terminal resistance calculation:

Vertical electrode resistance:

Calculation of grounding electrode ZZ-100-102

Ом - Ohm

where    ρ – is equivalent soil resistivity, 1,000 Ohm·m;

С – is a non-dimensional factor describing the electrolyte content in the surrounding soil, 0.25;

L – is vertical electrode length, 2.4 m;

d – is vertical electrode diameter, 0.065 m;

T – is depth, i.e. the distance from the ground surface to the ground electrode, 0.6 m;


Horizontal electrode resistance:

Calculation of a horizontal grounding electrode

Ом - Ohm
Гор - Hor

где    ρ – is soil resistivity, 1000 Ohm·m;

b - is horizontal electrode width, 0.03 m;

h - is horizontal electrode depth, 0.5 m;

Lгор – is horizontal electrode length, 66 m.


Electrical impedance of the grounding arrangement:

Grounding arrangement impedance

Ом - Ohm

where n – is a number of sets, vertical grounding arrangements - 2 pcs, horizontal grounding arrangement - 1 pc;

Kutil1 – is utilization rate, 0.99;

Kutil2 – is utilization rate, 0.7.


The calculated resistance of the grounding arrangement is 21,85 Ohm.

Lightning protection of arch framed and tent hangar

- Молниеприемник-мачта высотой 16 м - 16 m lightning arrester
- Комплект электролитического заземления - Electrolytic grounding set
- Полоса омедненная стальная сечением 30х4 мм - Steel copper-plated bar 30 x 4 mm

Figure 1. Equipment layout.


The list of necessary materials is provided in Table 1


Table 1. List of needed materials.

№ п\п Part number Name Quantity, pcs.
1. ZZ-201-016-В7-Сн5-С9 ZANDZ Lightning arrester, vertical, 16 m (zinc-plated steel; with embedded elements for the foundation; 7th wind region; 5th snow region; 9th seismic region) 2
2. ZZ-100-102 ZANDZ Electrolytic grounding set (horizontal; 3 meters long) 2
3. ZZ-005-064 ZANDZ Conductor connection terminal (up to 40 mm) 7
4. ZZ-007-030 ZANDZ Waterproofing tape 3
5. GL-11075-10 GALMAR Copper-plated strip (30 x 4 mm/S 120 mm²; 10-meter strip bundle) 1
6. GL-11075-50 GALMAR Copper-plated strip (30 x 4 mm / S 120 mm²; 50-meter strip bundle) 1

Do you have any questions regarding grounding and lightning protection of the arch framed and tent hangar? Please contact the ZANDZ Technical Center!

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