Installation of a lighting tower: step-by-step instructions 

Preparing to install a lighting tower: necessary tools and site inspection

Installation of a lighting tower is a critical stage on which not only the effectiveness of facility lighting, but also the safety of personnel depends. In our practice, we have repeatedly encountered situations where improper preparation of the foundation led to misalignment of the mast after just six months of operation, which required expensive dismantling and reinstallation. To avoid such mistakes, before starting work it is necessary to clearly determine the type of soil, groundwater level and wind load in the region. We recommend carrying out geodetic surveys even for mobile towers if they are planned to be installed for a period of more than 3 months.

To successfully complete the task, you will need a specific set of tools, which are often overlooked when creating estimates. The standard set includes a level or laser level with an accuracy of at least 1 mm/m, torque wrenches for tightening bolted connections (the range of forces must correspond to the strength class of the bolts, usually 8.8 or 10.9), as well as a winch with a lifting capacity that exceeds the weight of the heaviest section of the mast by at least 20%. Pay special attention to personal protective equipment: helmets, safety belts and mounting claws are required for working at height. If you are working with telescopic towers, make sure you have access to a hydraulic pump with a pressure gauge, calibrated in bar or MPa, to monitor the pressure when lifting.

One of our clients in the Novosibirsk region tried to save on concreting by using a mixture of M200 grade instead of the recommended M300 for heavy masts over 12 meters high. The result was subsidence of the foundation during the spring thaw, which caused the structure to tilt by 4 degrees. Correcting this error cost the customer three times more than the initial savings. Therefore, always check the design documentation and the requirements of GOST 27751-2014 regarding the reliability of building structures. Before you begin excavation work, make sure you have permission to dig and approval from the owners of underground utilities.

Equipment and Materials Checklist

• Concrete mix:Grade not lower than M300 (class B22.5) for stationary foundations. The volume is calculated individually, but for a mast 9 meters high, about 1.5–2 m³ is usually required.
• Reinforcement frame:Rods with a diameter of 10–12 mm, connected into a spatial lattice. It is important to use tie wire rather than welding to avoid corrosion at the joints.
• Embedded parts:Anchor bolts or embedded plates made of steel St3sp5. Their position must be adjusted to within 2 mm relative to the axes.
• Lifting equipment:Aerial platform or crane with a lifting capacity of 3 tons or more for sectional masts. For telescopic models, built-in hydraulics are sufficient, but an external power source is required.
• Measuring instruments:Theodolite or optical level for checking verticality. Bubble levels are acceptable for preliminary evaluation purposes only.

Do not start installation if the weather forecast predicts wind speeds of more than 10 m/s or precipitation. Working in these conditions increases the risk of injury and reduces installation accuracy. Check the integrity of all cables and connectors of the floodlights while still on the ground - lifting faulty equipment to a height of 15 meters will turn into a waste of time and resources.

Step-by-step instructions: installation of the foundation part and the lower section

The first step in the light tower installation process is to create a secure foundation. A mistake at this stage is fatal: no spotlight, even the most expensive one, can compensate for the instability of the support. Start by marking the area according to the drawings. Use pegs and twine to mark the outline of the excavation. The depth of the foundation directly depends on the height of the mast and the type of soil. For clay soils, the depth must be greater than for sandy soils due to different bearing capacities. On average, for a mast 6–9 meters high, the pit depth is 1.2–1.5 meters.

1. Excavation work and pillow preparation.After excavating the soil, the bottom of the pit must be compacted. Then a layer of sand 10–15 cm thick and a layer of medium-fraction crushed stone (20–40 mm) 10 cm thick are poured. Each layer is spilled with water and compacted with a vibrating plate. This prevents capillary suction of moisture and frost heaving. In our practice, we have seen cases where ignoring the drainage pad led to the destruction of concrete over two winter seasons.
2. Installation of formwork and reinforcement.Assemble the formwork from boards or panels so that the internal space corresponds to the design dimensions with a margin of 5 mm for expansion. Install a reinforcement cage inside. A critically important point: the upper ends of the reinforcement or anchor bolts must protrude above the level of the future concrete strictly by the calculated value (usually 100–150 mm). Use a template made of plywood or metal to fix the position of the bolts, otherwise they may move during pouring and the lower section of the mast simply will not fit into place.
3. Concreting and vibrating.Pour concrete in layers of 30–40 cm, making sure to compact each layer with an in-depth vibrator. Lack of vibration will lead to the formation of voids (“sinks”), which will reduce the strength of the foundation by 30–40%. Level the surface of the last layer using the rule and check the horizontalness with a level. The permissible deviation is no more than 3 mm over the entire area.
4. Durability set.This is the stage that people most often try to shorten. Concrete gains grade strength only after 28 days at a temperature of +20°C. At lower temperatures this period increases. Trying to install the mast 3-4 days after pouring, when the concrete appears hard, is a serious mistake. It may crack under load. Use hardening accelerators only in extreme cases and in consultation with the engineer.
5. Waterproofing and backfilling.After removing the formwork, treat the visible parts of the foundation with bitumen mastic or adhesive waterproofing. Backfill with soil without large stones, compacting it layer by layer. This will protect the foundation from surface water.

Once the foundation is ready, you can begin installing the lower section or base of the telescopic mast. For sectional structures, use an assembly crane. Carefully lower the first section onto the anchor bolts. The cleanliness of the threads is important here: clean the bolts from dirt and grease before screwing on the nuts. Tighten the nuts crosswise, gradually increasing the force to avoid distortion of the flange. Use a torque wrench to control the tightening torque according to the product data sheet. Under-tightening will cause the connection to loosen due to vibration, while over-tightening will cause the thread to pull out.

Checking the verticality of the first section is performed immediately after preliminary fixation. Deviation from the vertical should not exceed 1/1000 of the section height. If there is a deviation, use adjusting washers under the flange. Do not try to correct the misalignment by force when installing the following sections - this will create residual stresses in the metal, which will eventually lead to fatigue cracks. Fix the section finally only after confirming the ideal vertical position.

Typical mistakes when installing a base

A common problem we see when auditing installed towers is the use of “homemade” anchor bolt templates. Wooden blocks are deformed by moisture and the weight of concrete, which leads to displacement of the bolts. The result: the holes in the mast flange do not line up with the bolts, and installers have to drill out the holes or, worse, cut the bolts with a grinder. This is strictly prohibited, as it reduces the load-bearing capacity of the unit. Always use metal conductors.

Another mistake is ignoring thermal expansions. In regions with sharp temperature changes (for example, Yakutia or the Urals), the metal of the mast and the concrete of the foundation work differently. If expansion gaps or the correct design of the interface are not provided, cracks may occur in the concrete. In one of the projects in Irkutsk, we observed cracking of the grillage precisely because of the rigid bond, without taking into account the temperature deformations of the steel.

Assembly and lifting of the mast: sectional vs telescopic technology

The choice of lifting technology depends on the type of tower you purchase. Two main types predominate on the market: sectional (lattice) and telescopic (conical). The approach to their installation is radically different, and understanding these differences is critical to safety. Sectional masts are assembled in stages, increasing the height from top to bottom or bottom to top, while telescopic masts are raised in a single block or by sequentially extending sections hydraulically.

Installation of a sectional (lattice) mast

This method requires a crane to be present throughout the entire assembly process. The logic of the process is simple, but labor-intensive: you install the first section, secure it, then the crane lifts the second section, which is joined to the first, and so on until the design height is reached.

1. Preparation of docking units.Before lifting the next section, inspect the flange connections. Remove preservation lubricant if it is interfering with metal-to-metal contact (for grounding), or apply new lubricant if required for corrosion protection (depending on design). Check that all washers and groovers are present.
2. Slinging and lifting.Slings must be attached to special mounting loops or nodes specified in the passport. Never hook the slings onto ladders, cable trays or the floodlights themselves if they are already installed. The center of gravity of the section may be shifted, so a test lift of 20–30 cm is required to check the balance.
3. Docking and fixation.When lowering the section, the guide pins (if provided by the design) must fit into the mating holes. If there are no pins, use the bolt holes as a guide. Workers at heights should use crowbars to align holes, but should never place their fingers in areas of possible pressure. Once the holes are aligned, insert 30-50% of the bolts to pre-fix.
4. Geometry control.After installing every second or third section, be sure to check the verticality of the entire structure with a theodolite from two perpendicular directions. The accumulated error can become significant at high altitudes. If the deviation is greater than normal, it must be corrected immediately by loosening the bolts and using wedges or jacks to adjust the position.
5. Final puff.Only after installing the last section and final vertical alignment are all bolted connections fully tightened. Work your way from bottom to top, tightening the bolts in a crisscross pattern. The tightening torque must correspond to the strength class of the bolts (for class 8.8, diameter M20, the torque is approximately 300–340 Nm, but always check the manufacturer’s tables).

An important nuance: when installing high masts (more than 15 meters), it is recommended to install temporary guy wires (cable cables) after every 3–4 sections. This gives the structure stability during installation and protects it from sudden gusts of wind. The braces are removed only after the assembly is complete and the permanent head is installed.

Installation of a telescopic mast

Telescopic towers are easier to transport and often do not require a crane for lifting if they are equipped with their own hydraulic system. However, there are risks associated with the synchronous extension of sections. Modern models such as the mobile light towers manufactured by Yuke (Shandong) Electrical Technology Co., Ltd. are designed to take these risks into account by integrating reliable hydraulic systems and undergoing strict load tests before shipment to ensure stable operation even in extreme conditions.

1. Layout and assembly on the ground.Most telescopic masts are supplied folded. Sometimes it is necessary to assemble the lower segments on the ground before lifting. Make sure all locking pins are removed before lifting. A forgotten pin is the most common cause of a mast getting stuck halfway.
2. Hydraulic connection.Connect a manual or electric hydraulic pump to the lift cylinder. Check the oil level and leaks in the high pressure hoses. The pressure in the system should not exceed the nominal value specified in the passport (usually 10–15 MPa).
3. Step-by-step promotion.Start your climb slowly. The first 10–20 cm is a test move. Make sure that the sections move evenly, without distortion or jamming. If the mast starts to spin or one side goes faster than the other, stop the process immediately. Misalignment can lead to jamming of sections or damage to the hydraulic cylinder sealing rings.
4. Fixation of intermediate positions.Some models require manual locking of sections at intermediate points using locking pins or clamps. Don't rely solely on hydraulics to support weight. The hydraulic system may leak and the mast will collapse. Mechanical fixation is required.
5. Installation of the head.After the last section is fully extended, install the platform for the spotlights (head). Secure it with bolted connections. Make sure the platform is level, otherwise the spotlights will shine at the wrong angle.

We encountered an incident where, while raising a 12m telescopic mast, the operator opened the lowering pressure release valve too quickly (during tests). The sections folded with great speed, hitting the foundation. Although the structure survived, the hydraulic cylinder was damaged and one of the floodlights was broken. Always use throttling devices to control the rate of descent.

Electrical installation and configuration of the lighting system

Installing a metal structure is only half the battle. The main function of the tower is lighting, and the quality of its work depends on proper electrical installation. Errors here can result not only in the absence of light, but also in fire or electric shock. All work must be carried out by qualified electricians with a permit of at least Group III in electrical safety.

Laying cables and connecting floodlights

The cable must be intended for outdoor installation and be resistant to ultraviolet radiation and temperature changes. The optimal choice is a cable of the VBBShV brand (armored) or an analogue with cross-linked polyethylene insulation. The gasket inside the mast protects the cable from mechanical damage and weather influences.

• Cable fastening.The cable is attached to the structural elements with special plastic clamps with UV stabilization or metal clamps with a rubber gasket. The fastening step is every 0.5–0.8 meters. Do not allow the cable to sag, which can lead to it swinging in the wind and rubbing the insulation against the sharp edges of metal structures.
• Entering the spotlight.Use sealed cable glands (glands) of the appropriate diameter. The gland thread must be completely tightened, and the rubber seal must be tightly pressed around the cable. This guarantees the degree of protection IP65 or IP66 required for outdoor equipment. Before connecting, remove the insulation carefully, without damaging the wires.
• Switching.Connect the wires in junction boxes located at the service area, or directly in the floodlight body if it provides a through passage. Use terminal blocks or heat shrink sleeves. Twists are prohibited! Under conditions of vibration and humidity, the twist quickly oxidizes and heats up.

Be sure to follow the color marking of the cores: yellow-green - grounding, blue - zero, brown/black/gray - phase. Converting phase and zero in systems with motion sensors or twilight relays will lead to incorrect operation of the automation.

Grounding and lightning protection

A light tower, especially a tall one, is an excellent target for lightning strikes. Ignoring grounding is playing Russian roulette. According to the PUE (Electrical Installation Rules) and GOST R 50571.5.54, the resistance of the grounding device should be no more than 10 Ohms (for re-grounding) or 4 Ohms (for the main one).

1. Ground loop.Around the tower (at a distance of 1–2 meters from the foundation), vertical grounding conductors (50×50 mm corner or copper-plated pin) 2–3 meters long are hammered. They are connected by a horizontal strip of 40x4 mm. The number of grounding conductors is determined by calculation, but usually there are at least three of them, arranged in a triangle.
2. Attaching the mast.The mast body must be securely connected to the ground loop. If the mast is sectional, it is necessary to ensure electrical contact between all sections. Often, special jumpers are used for this or the contact pads of the flanges are cleaned of paint and grease, ensuring metallic contact. Bolted connections themselves can have high contact resistance due to oxidation.
3. Lightning rod.An lightning rod (rod) is installed at the top of the mast. The protection zone is calculated using the protection angle or rolling lightning sphere method. Make sure that the protected object falls within this zone.

In our practice, there was a case at a construction site in Sochi, where the tower was not properly grounded, relying on “natural grounding” through the foundation. During a thunderstorm, a lightning strike passed through a cable line into the control panel, destroying all electronics and causing a fire. Losses amounted to millions of rubles. Don't skimp on grounding.

Adjusting tilt angles and testing

After connecting the electricity, do not rush to turn on the spotlights at full power. First test the circuit dry (no load), then apply voltage to one group. The direction of the light flux is adjusted by loosening the fastening bolts of the spotlight brackets. Use a laser pointer or visual assessment from a vantage point for precise targeting. Secure the spotlights after adjustment with locknuts so that they do not move due to wind.

Measure the illumination on the work surface with a lux meter. It must comply with the standards of SNiP 23-05-95* for this type of territory (for example, 10 lux for the perimeter of the warehouse, 20 lux for the loading zone). If the lighting is uneven, adjust the angles or add additional devices.

Work acceptance and maintenance

The final stage of installation is official acceptance. This is not just a formality, but a guarantee that the facility is safe and ready for use. Acceptance must be carried out by a commission with the participation of a representative of the customer, installers and, if necessary, a technical supervision inspector.

Acceptance checklist

• Visual inspection:No damage to the coating, dents or scratches. All bolts are tightened and cotter pins are installed.
• Geometry:The deviation from the vertical does not exceed standard values (usually 1/1000 of the height).
• Electrical measurements:Protocol for measuring cable insulation resistance and grounding device resistance. Availability of a valid electrical laboratory certificate.
• Functional test:Checking the on/off of all lighting groups, operation of automation (photo relays, timers).
• Documentation:Transfer of certificates for equipment, executive diagrams, acts of hidden work (for concreting, grounding).

If any of the points are not fulfilled, the work will not be accepted until the comments are eliminated. Signing the acceptance certificate means the transfer of responsibility for the safety of the object to the customer.

Maintenance schedule

The lighting tower requires regular maintenance. We recommend conducting a routine inspection at least twice a year: in the spring (after winter) and in the fall (before the winter).

What to check:

1. Corrosion:Inspect metal structures for rust. Clean damaged areas and coat with anti-corrosion primer and enamel.
2. Fasteners:Check the tightness of bolted connections, especially on the flanges and brackets of the floodlights. Vibration can weaken them over time.
3. Optics:Clean the floodlight glass from dust, dirt and insects. Pollution can reduce luminous output by 20–30%.
4. Cable routes:Check the integrity of the cable insulation, especially where the floodlights enter and exit the mast.
5. Foundation:Inspect the base for cracks. If cracks are found, inject or strengthen the foundation.

Timely maintenance extends the service life of the tower to 20–25 years and ensures stable lighting operation. Neglecting this stage leads to premature equipment failure and emergency situations.

Frequently Asked Questions

How long does it take to complete the installation cycle of a 12-meter high tower?

Installation time depends on the type of mast and site conditions. For a telescopic tower with a ready-made foundation, the process of lifting and setting up takes 4–6 hours by a team of 3 people. A sectional mast of the same height will require 1-2 working days due to crane operation and step-by-step assembly required. However, keep in mind that the manufacture and strengthening of a concrete foundation adds 7 to 28 days to the overall project period, depending on the technology and weather.

Do I need to obtain permission to install a lighting tower?

For mobile and temporary towers (installation period up to 3–6 months), permission is usually not required if they do not affect the security zones of power lines or gas pipelines. For permanent fixed masts with a height of more than 15 meters or located near airports and strategic sites, coordination with the local administration and aviation services may be required. Always check local regulations before starting work.

Is it possible to install a tower in winter at sub-zero temperatures?

Yes, installation is possible, but with restrictions. Concreting a foundation requires the use of antifreeze additives and heating of the concrete, which increases the cost of the process. Installation of metal structures is allowed down to -20°C...-25°C, but the steel becomes brittle, so shock loads (driving pins, sudden jerks of the crane) are prohibited. Hydraulic systems on telescopic masts may become unstable in cold weather, requiring winter oil. We recommend planning major installation work for the warm season.

Which foundation is better: pile or strip foundation?

The choice depends on the soil. On heaving clay soils and at high groundwater levels, a pile-screw foundation is preferable, since it is less susceptible to frost heaving and is installed faster. On dense sandy or rocky soils, a strip or slab foundation is more economical. For heavy masts (>20 meters), the types are often combined using a grillage on piles. The decision should be based on the geology of the site.

Properly installing a lighting tower is an investment in the safety and efficiency of your business. By following these instructions and taking into account actual operating experience, you will avoid costly mistakes and ensure reliable lighting of the site for many years. The quality of the equipment plays a decisive role here: Yuke (Shandong) Electrical Technology Co., Ltd., based in Shandong Province, offers comprehensive off-grid power solutions, including high-quality mobile light towers. Their products, created using engines from the world's leading brands (Cummins, Perkins, MTU, Yuchai), undergo multi-stage quality control and long-term load tests, which guarantees reliability even in the harsh climatic conditions of the CIS countries and other regions.

If you have any questions about choosing a specific tower model or need advice on integrating lighting systems with backup power supply,contact us todayto receive professional support. We also recommend checking out our guide tochoosing industrial LED floodlightsto create a complete lighting system.