# Lightning protection and grounding of the railway passage

The infrastructure of railway bridges includes many buildings and structures. They all need lightning protection. ZANDZ Technical Center recently received an application for the calculation of lightning protection of such buildings. Among them there are a station, a checkpoint, a police station, a garage and an aviary for service dogs. For each of the buildings, the ZANDZ Technical Center offered an individual solution for the protection against lightning. Let's study them in detail.

## Solution

The calculations are made in accordance with the following documents:

Protection of buildings from lightning strikes is carried out with the help of lightning rods. A lightning rod is a device rising above a facility that diverts lightning current into the ground without entering the facility. It consists of a lightning rod which directly takes the lightning discharge upon itself, a down conductor and a ground electrode.

## External lightning protection of the railway passage objects

The set of measures to ensure the requirements for the lightning protection system of each of the buildings of the railway passage is represented by the following decisions:

1. Installation of rod lightning rods is carried out. The heights and locations of the lightning rods are indicated on the drawings of each task.
2. Down conductors are laid from lightning rods using copper bonded wire D = 8 mm, which are connected to an artificial ground electrode.
3. The lightning rods are also interconnected to arrange two down conductors from each lightning rod.
4. Fixation of down conductors (installation distance 0.6-1 m):
1. Connection and branching of down conductors is carried out with the help of GL-11551A clamps.

## Grounding of railway passage facilities

The set of measures to ensure the necessary requirements to the grounding device of each of the buildings of the railway passage is represented by the following solutions:

1. Horizontal ground electrode is laid in accordance with the drawing of each building. The contour is made of corrosion-resistant copper-bonded stainless steel tape with the cross- section 4x30 mm, laying depth 0.5 m, distance to the wall of the building- at least 1 m.
2. Installation of vertical electrodes with a length of 3 m (copper-plated steel pins with a diameter of 14 mm) in the places of the descent of down conductors
3. Interconnection of horizontal electrodes is carried out by using clamp ZZ-005-064.

The arrangement of the elements of lightning protection system and the grounding device of the railway passage facilities is shown in Figures 1-5. The depicted protection zones correspond to the reliability of 0.9 of IS.

Figure 1 - Plan of lightning protection of the station

Figure 2 - Plan of lightning protection of the police station

Figure 3 - Plan of lightning protection of the checkpoint

Figure 4 - Plan of lightning protection for a garage for 11 cars

Figure 5 - Plan of lightning protection of the open aviary for service dogs

отверстие 150 на 150 – hole 150 to 150
Зона защиты на отм 3000 – protection zone at the mark of 3000
Сетчатое ограждение- mesh fencing

## Accessories for lightning protection of the station

 № Figure Product item Product Quantity Lightning protection system 1. ZZ-201-004 ZANDZ Vertical air-terminal -mast 4 m (stainless steel) 8 2. GL-20022 GALMAR Clamp to ZZ-201-004 lightning rods for down conductors (stainless steel) 8 3. ZZ-203-001 ZANDZ Fastening for lightning rod to the wall (stainless steel) 8 4. GL-11149-50 GALMAR Copper- bonded steel wire (D8 mm; coil of 50 meters) 2 5. GL-11149-10 GALMAR Copper-bonded steel wire (D8 mm; coil of 10 meters) 1 6. GL-11551A GALMAR Clamp for connecting down conductors (painted galvanized steel) 2 7. GL-11747A GALMAR Clamp for a roof covered with metal / corrugated sheet, for the down conductor (painted galvanized steel) 28 8. GL-11711 GALMAR Clamp for down conductor on a flat roof (D8 mm; plastic, concrete) 22 9. GL-11703A GALMAR Clamp to the facade/wall for an elevated down conductor (height 15 mm; painted galvanized steel) 56 10. GL-11562A GALMAR Control clamp for connecting down conductors wire+tape (painted galvanized steel) 8 Grounding device 11. ZZ-005-064 ZANDZ Clamp for connecting conductors (up to 40 mm) 10 12. GL-11075-50 GALMAR Copper-bonded tape (30 * 4 mm / S 120 mm²; coil of 50 meters) 3 13. GL-11075-20 GALMAR Copper-bonded tape (30 * 4 mm / S 120 mm²; coil of 20 meters) 1 14. GL-11075-10 GALMAR Copper-bonded tape (30 * 4 mm / S 120 mm²; coil of 10 meters) 1 15. ZZ-001-065 ZANDZ Copper-bonded threaded grounding rod (D14; 1.5 m) 16 16. ZZ-002-061 ZANDZ Threaded coupler 9 17. ZZ-003-061 ZANDZ Starting tip 8 18. ZZ-004-060 ZANDZ Driving head for a jackhammer 4 19. ZZ-006-000 ZANDZ Conductive grease 1 20. ZZ-007-030 ZANDZ Waterproof tape 3 21. ZZ-008-000 ZANDZ Header for a jackhammer (SDS max) 1

Are you interested to know what materials are required for lightning protection of other buildings included into the infrastructure of a railway passage? Please contact our ZANDZ Technical center!