Fan installations are mainly used for ventilation of mines. Recently, the ZANDZ technical Center received a request to calculate such an installation. For lightning protection of the facility there was a basic requirement to fulfill the 2nd category according to the AD. Let’s consider our offered solution in more detail.
Calculation of lightning protection of a fan installation building
Object: fan installation building.
Figure 1 – Object plan.
Task: Perform calculations of lightning protection system of the fan installation building
Solutions to ensure the requirements for the lightning protection system of a building of a fan installation:
- Lightning protection was carried out in accordance with Electric Installation Code EIC 7-th ed. IS 153-34.21.122-2003 «Instruction to lightning protection of buildings, structures and industrial communications» (hereinafter IS); AD 34.21.122-87 «Instruction on arrangement of lightning protection for buildings and structures» (hereinafter AD).
- The object refers to the II category of lightning protection according to AD. The reliability of the system should be at least 0.95.
- Lightning protection of the object is made using, lightning protection mesh with a pitch of not more than 6x6 m. The mesh is made of copper-bonded (copper coating thickness of at least 70 μm) wire d8 mm (GL-11149).
- A copper-bonded steel (copper coating thickness of at least 70 μm) wire d8 mm (GL-11149) is used as a down conductor.
- Installation of down conductors is carried out using the clamp GL-11711 - on a flat roof, GL-11703A - on vertical surfaces. Clamp installation pitch 0.8-1.0 m.
- The universal clamp GL-11551A is used to connect rolled products in length and in nodes.
- All metal elements located on the roof must be connected to the down conductor using the clamps GL-11545A. Stairs, railings, are attached using the clamp-clamp GL-11514N.
- The grounding device is provided by the customer.
- Connection to the grounding device is carried out using the terminals ZZ-005-064.
Figure 2 shows the location of the equipment.
Table 1 lists the required equipment and materials.
- Условные обозначения – type codes
- Проволока стальная омедненная диаметром 8 мм – copper-bonded steel wire 8 mm in diameter
- Универсальный зажим-соединитель для проволоки – universal connecting clamp for wire
- Фальцевая клемма для крепления к металлическим конструкциям- Folded terminal for attaching to metal structures
- Зажим-хомут - clamp
- Опуск токотвода – down conductor down drop
Figure 2 - Location of equipment for lightning protection of a building of a fan installation.
Table 1 - A list of material requirements.
|
№ |
Picture |
Product item |
Name |
q-ty |
|
1. |
|
GL-11149-50 |
GALMAR Copper-bonded wire(D 8 mm / S 50 mm²; coil of 50 meters) |
9 |
|
2. |
|
GL-11551A |
GALMAR Clamp for connecting down conductors (painted galvanized steel) |
50 |
|
3. |
|
GL-11711 |
GALMAR clamp on a flat roof for down conductor (plastic, concrete) |
280 |
|
4. |
|
GL-11703A |
170 |
|
|
5. |
|
GL-11545A |
GALMAR Clamp for a gutter for down conductor (painted galvanized steel) |
10 |
|
6. |
|
GL-11514N |
GALMAR clamp for a waterspout for down conductor (tinned copper tape + stainless steel clamp( |
10 |
|
7. |
|
ZZ-005-064 |
9 |
Do you have questions on lightning protection of fan installation buildings? Contact ZANDZ Technical Center!
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