Cranes and Warning Beacons

Due to their tall construction, warning devices for cranes are essential not only for the general public but also for nearby aircraft. These warning signals help construction workers and pilots alike to detect a possible danger and give a signal to avoid collisions with other cranes, structures and aircraft. The use of beacons helps to minimise this risk.
When installing a beacon on a crane, it is essential to consider the standards required – for example the number of obstruction lights to use, their visibility and position. It is also necessary to ensure they meet the regulations of ICAO (International Civil Aviation Organization) and FAA (Federal Aviation Administration).

When choosing the correct obstruction light, the type of crane and its height needs to be considered; the type of crane will be the basis for the number of lights needed to be installed and the height is the basis for the type of obstruction light required.
Standards do change and get updated, so please do check with your local authority before installing to a crane, but currently the standard height is 150 meters. If a crane is below this height, an obstruction light is required only if it’s location can be a danger to air navigation. If a crane is above this height, an obstruction light must be installed.

As a guide, the type of light to be fitted:
Low Intensity fixed red lights.
Used on cranes and tower cranes between 60 to 90 meters high, they are usually installed on top of the crane to ensure visibility. These lights should be visible in every direction.

Medium Intensity fixed red lights.
Used on cranes between 90 to 150 meters high, they are usually installed on top of the crane and on the cranes jib. These lights should be visible in every direction.

2000cd fixed red lights.
These lights are installed for night use.
For cranes that are 150 meters tall and above, they are installed close to the top and placed with a 50 meter gap in between. For every additional 50 meters on the crane’s height, an additional beacon needs to be installed.

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Top 10 Crane Hand Signals

Hand signals are essential to better control crane operations. It demands a skilled person to communicate hand signals well with other workers in the area. This post explains different hand signals to finish crane projects safely.

1. Hoist

Lifting the load requires the signal person to extend their arm vertically while pointing upwards, with the index finger making a circular motion.

The main hoist has greater strength which crane operators use occasionally. The signaller then raises their arm and bends the elbow to tap their fist on their head. Then, perform regular hand signals for further actions.

To use an auxiliary hoist, bend an arm pointing upwards and then tap the elbow with the other hand.

2. Lower Load

Lowering the load is the opposite of the prior hand signal. An arm should extend horizontally pointing the index finger downwards, doing a circular motion.

3. Raise Boom

The signal person will help crane operators maneuver the boom. First is to raise the boom, he shall extend an arm parallel to his body. With a closed fist, then signal thumbs up.

4. Lower Boom

To lower the boom, the signal person will again extend its arm horizontally but signal thumbs down.

5. Lower the Boom and Raise the Load

This is a dual motion that requires repeating the lower boom and raise the load signal with different arms. The right arm with the thumb pointing downward and the other arm with the forefinger pointing upward in horizontal circles.

6. Raise the Boom and Lower the Load

This crane sign is totally doing the opposite of the previous hand signal. Raise the boom with an extended arm and thumb pointing upwards. To lower the load, point the forefinger down and rotate in circles.

7. Swing Boom

Horizontally extend an arm and use the index finger to point out where the boom shall swing. You can use either the right or left arm to point direction.

8. Extend Boom

To extend the boom signal is simply to lengthen the boom. The signal person will extend his hands in front of the waist with the thumbs pointing outwards. The other fingers remain in the fists.

9. Stop Signals

Stop signals are used in the construction site most of the time. It includes three hand signals to stop a particular crane activity.

First is the emergency stop where both arms extend horizontally with palms facing down. Then, the signal person will swing his arms back and forth.

To stop action, a single-arm is extended with the palm facing down then the arm swings back and forth.

Lastly, the stop everything signal which stops all the crane activities. It demands placing the hands together at waist level.

10. Move Slowly

Speed signal is as important as the other hand signals to control the movement of cranes. There are times for operations that need to slow down, for safety purposes. The signaller will warn the crane operator to move slowly by placing one hand above the other doing an action signal.

Final Thoughts

It is useful to have a copy of the crane hand signals around the workplace to ensure a safer operation. Better educate the workers with the basic crane signals, as mentioned earlier. Failing to do so can cause issues in the future. Another reason to learn more about hand signals is to prevent miscommunication in the workplace – regardless of the loud environment, a smooth operation is still possible.

How Signalling Devices Ensure Safety During Crane Operations

Safety is crucial where crane operations are in place, especially between the operators and other workers wherein loads are nearby. So, audible and visual warnings become an essential to avoid significant damages.

What is a Crane Operation?

Crane operations make construction work so much easier. It is responsible for carrying heavy loads from one place to another with less intervention from people.  Therefore, extra help is needed to avoid any difficulties in transferring materials such as the risk of injuries among workers.

Some use hand signals to fulfill safety requirements within the facility with crane operation. This technique requires a signal person to ensure everything is operating smoothly under its control. Different hand  signals usually have different meanings in this environment, hence, the room for error is highly possible and could affect the entire operation.

How Do Signalling Devices Work?

Beacon signalling devices are a simpler solution in maintaining safety with crane operations. They are composed of audible and visual signals to reduce the risk of harm or damage, and benefit all types of workers in all conditions.

When choosing a device, it is essential that the noise level and / or brightness is considered for the environment. Failing to consider these factors may not provide the full advantage of the warning device.

The decibel level must not be less than 5dB and more than 10dB to achieve friendlier sound pressure. A sounder device should be installed toward the load to deliver warning straightway.

For visual warning devices, the brightness level will depend on distance, unlike the audio signal. It should be installed on the crane’s bridge for better visibility thus reduces risk.

Another important factor to consider is the easy installation to get started. Most warning devices for crane operations are shipped ready to install, commonly mounted on the crane. They are usually built with LEDs for energy saver applications thus brighter than most other type of lights.

Sounder and the visual combinations are also available on the market, providing maximum safety and benefitting not only the workforce, but the entire crane operation.

Advantages of Signalling Devices in Crane Operations

Reduced Risk

Hearing a coming crane within the facility can be difficult, and so avoiding the risk of injuries. A signalling device will warn personnel of the approaching danger by a crane carrying loads of heavy equipment. As a result, the possible danger is highly avoided.

Reduced Lost time

When the crane operation is going smoothly, improved safety is the result. The main reason for the downtime over a crane is the warning personnel, mentioned earlier, using hand signals. With the help of proper signalling devices, a smooth, efficient process can be assured.

Reduced Revenue Loss

Revenue is a great sign of a facility doing better operations. Proper maintenance of the warning devices will bring more profit in the long-run, even when it demands more initial cost.  

Efficient Operation

The signalling devices also speed up the operation, with safety in mind. It actually promotes saving up costs for future uses. Warning devices ensure safety against possible collisions in and out of the facility.

Final Thoughts

To sum it all, crane operations will be better all round with properly installed signalling devices. They assure safety for all the work force inside the facility and also help speed up the overall business. The fear of sudden collisions against heavy equipment can be reduced by the use of these warning devices. See our website to find your preferred device, which continue to benefit construction sites around the globe.

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Crane Signalling

Crane operations are found to be much safer with the use of warning lights. They are part of the anti-collision system that helps to reduce accidents, ensuring safety throughout the operation.

What is Crane Signalling?

A crane is a machine that carries heavy loads from one place to another on which manpower alone could not do. Crane signalling lights loosen up the work of crane operators for safety awareness, allowing the work to be carried out efficiently – even during nighttime operation when the potential danger on tall structures can be increased.

Tower cranes differ in height, and can therefore require different types of beacon lights. They vary from low to medium intensity lights with increased visibility at night. These lights are made up of LEDs to meet the ICAO requirements, as well as having a low power consumption and longer life.

Reasons for Using Warning Lights on Cranes


First of all, warning signals bring safety to any workplace, especially when working with machines such as cranes. Adding safety lights makes the workers more aware of the operation by the visual warning, and more importantly, aircraft are forewarned of the location of the tall structure, reducing the risk of collision.


Controlling crane operation can be quite stressful, even for expert crane operators. The use of warning lights on cranes will result in easier and more convenient operation. There is higher control in transferring loads from one place to another, and a lower chance of human error in the long run.

Accelerate Operation

Working with the help of machines ensures productivity can be increased. With risks reduced by the use of warning signals, a safe workplace can result in a more productive workforce.

Prevent Aircraft Collision

Since cranes are tall structures, they are most certainly an obstacle for aircraft. Installing a warning light is imperative, to warn aircraft of potential danger from a distance. Thus, the risk of collision will be reduced greatly.

How does crane signalling with lights work?

Crane signalling with lights has to work with the workplace’s safety at all times. They warn pedestrians that there is a moving load nearby, so no one will attempt to go near. In short, the device creates an awareness in the workplace of a moving machine carrying loads.

Final Words

In the field of construction, tower cranes play a vital role in moving heavy loads. They increase safety in and out of the workplace with easy installation. Also, aircraft shall be warned ahead of time that there is a tower crane situated, and so prevents severe accidents from occurring.

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Stacking Beacons on Crane Construction

Crane construction offers a wide range of services that greatly require the use of beacons. Without such devices, the overall operation would be dangerous for the workers and the public.

What are Stacking Beacons?

Construction works are much safer when stacking beacons are installed. It is similar to other beacon devices, but this one is mainly made for machine operations, as its function focuses on the machine conditions along with the production.

The control in an overall workplace is levelled up with this warning device. Stacking beacons are durable to meet any sort of problem within an area, and provides security for the workers and the business itself where they are applied.

The other names for stacking beacons are indicator lights, light towers, signal lights, and tower lights. They deliver audible and visual warnings in crane construction and other industrial manufacturing.

Stacking Beacons

These devices are well known as “stacking beacons” as the way it is positioned in a stacked alignment. They are in a columnar structure made up of either LED, incandescent, or xenon strobe light source. The lights can be flashing or static, whichever will meet your needs. It is built with colour-coded indicator segments in five different colours, including clear white, red, amber, blue, and green.

The placement of lights is on top of one another. Each light indicates the level of machine state conditions, usually as below:

White Light

The clear white light is for productivity monitoring or user-defined conditions present in a particular machine.


Whenever we see red lights, it indicates an emergency stop warning. It works when there are failure conditions on a machine.


This light reduces the effort of every worker asking for help. It turns on when an external help request has made. So, no need for an operator to speak loudly to get some raw materials or other sorts of help.


Amber colour indicates pressure and temperature conditions over a machine, whether it is under or over the normal state. In short, it gives a warning message to the workers.


Once the green light flashes, the operation is at a normal condition and there is nothing to worry about.

How Do Stacking Beacons Work On Crane Construction?

Stacking beacons are applied in different works in manufacturing industries. They are used to monitor productivity, processes, minimize waste, and to deliver warning indications over machine faults.

It is a passive device that can be operated using different control systems or programmable controllers. They are connected to the crane controls to function properly and accurately.

This warning device draws people’s attention whenever a fault condition happens by the visual alarm. It indeed minimizes further damage in the workplace, thus benefits the business immensely.

Also available is an audible alarm that is fitted on top of the tower unit for additional warning. The module can also be directly attached to the base, whichever the set up will be, it is still acceptable.

All in all, stacking beacons are a multi-status signalling device perfect for crane construction and other applications. It is a good sounder module, as well as a light indicator in times of emergency.

Final Words

A warning device should be counted as an attention-grabbing tool to secure the whole facility while at work. Proper installation of the stacking beacons is necessary to have a positive effect on the overall crane operation and ensure the workplace’s safety.

These devices are easy to install and work efficiently and effectively for the good of the business and all people involved in operations.

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