Beatrice Lang
Electrifying a crane is a complex process that requires careful consideration of the specific needs and constraints of the crane system, the work environment, and power availability. Electric cranes are a popular choice for light-duty or short-cycle lifting applications due to their affordability and ability to operate without running the truck engine. However, they may not be suitable for heavy-duty applications or frequent use due to their limited lifting capacity and slower lifting process. To electrify a crane, several methods can be employed, including cable festoons, conductor bars, or cable reels, each with its own advantages and disadvantages. Conductor bars, also known as power bars, are a common method that utilizes a sliding shoe collector system to supply power, while cable festoon systems provide a straightforward design that can accommodate multiple layers of cables. The choice of electrification system depends on various factors, and each system has its trade-offs in terms of cost, ease of maintenance, and suitability for different environments.
| Characteristics | Values |
|---|---|
| Crane type | Electric crane, electric overhead travelling crane (EOT crane), electric truck crane, gantry crane, single girder crane, double girder bridge crane, hydraulic truck crane |
| Electrification system | Conductor bars, cable festoon systems, cable reels, energy chains, overhead crane power rails, monorail electrification systems |
| Conductor bar materials | Galvanized steel, copper, stainless steel |
| Conductor bar advantages | Excellent for crane setups with future upgrades or expansions, easy to extend runway systems, suitable for interlocking crane systems, higher amperage power |
| Conductor bar disadvantages | Collector shoes wear out and need servicing or replacement, not suitable for explosion-proof cranes or power transfer carts |
| Festoon system advantages | Easy to maintain, straightforward design and operation, can accommodate light cables or be customized for heavy-duty applications, simple installation with "plug and play" electrical connections |
| Festoon system disadvantages | Not ideal for runways with multiple bridges |
| Power transfer components | Cable festoons, conductor bars, cable reels |
| Control methods | Push button pendants, radio remote controls, control panels, operator cabins |
| Electric crane advantages | Low-cost, suitable for light-duty or short-cycle lifting, can operate when the truck isn't running, no additional hydraulic components needed, saves fuel and reduces vehicle wear |
| Electric crane disadvantages | Limited lift capacity, not suitable for heavy-duty applications, frequent use shortens lifecycle, slower lifting process |
| Hydraulic crane advantages | Higher lifting power (up to 14,000 pounds), suitable for extended lifting periods, greater control and operating efficiency |
| Hydraulic crane disadvantages | Higher cost, requires installation of hydraulic components and power take-off devices, trucks' engines must idle during operation, increased maintenance costs |
| Infrastructure considerations | Trenches, cable protectors, cable ramps, conduits, jib cranes, bridge cranes, crane coverage, bus duct, busway |
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What You'll Learn
- Cable festoons, conductor bars, or cable reels are used to transfer power
- Conductor bars are made of galvanized steel, copper, or stainless steel
- A festoon system organises cable and allows it to stack without twisting
- Trenches are best for running electricity under a garage door
- A festoon electrification system uses flat or round cable on a trolley
Cable festoons, conductor bars, or cable reels are used to transfer power
Cable festoons, conductor bars, and cable reels are used to transfer power from a building's power supply to a crane's runway and bridge crane control panel. These components are then used to supply power to the hoist trolley, which is used to lift and move loads.
Cable festoons
Cable festoons are a type of electrification system that utilizes flat or round cable on a trolley travelling on a C-track, square rail, or I-beam. This method provides direct contact, resulting in greater resistance to wear and tear on the system's components. They are reliable and can be used in various environments, including high-temperature settings. Festoons are also effective for cable management in light- to medium-duty applications.
Conductor bars
Conductor bars are one of the most common methods of supplying power to cranes. They use a sliding shoe collector system, which offers higher amperage power and reduces exposed conductor safety hazards. They are ideal for facilities with low ceiling heights and crane setups where future upgrades or expansions are considered. However, they may not be suitable for environments requiring explosion-proof cranes.
Cable reels
Cable reel systems provide a continuous power source to the crane and are relatively easy to install and maintain. They can be mounted above, below, or alongside the crane, but they typically manage only one cable. Cable reels may not be space-efficient or cost-effective for exceptionally long travel distances.
The choice between these options depends on various factors, including power needs, availability of space, size of the crane system, and the work environment. Each system has its advantages and disadvantages, making it suitable for specific crane types and applications.
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Conductor bars are made of galvanized steel, copper, or stainless steel
Electrifying a crane is a complex process with many considerations. One of the most common methods of supplying power to a crane and hoist is through the use of conductor bars, also known as power bars, figure-eight bars, or hot bars. These bars are made of galvanized steel, copper, or stainless steel.
Conductor bars are an excellent choice for crane setups that may require future upgrades or expansions. They are easy to connect and extend, making them a cost-effective solution for interlocking crane systems. Conductor bar systems generally consist of four linear bars, with three live bars and one ground bar, along with collectors and mechanical components for installation.
One advantage of conductor bars is their ability to supply higher amperage power compared to other power systems. They utilize a sliding shoe collector system, which helps remove most exposed conductor safety hazards. Most conductor bar systems today are insulated with a cover, although there are some applications where the bar may not be insulated.
The choice of material for conductor bars depends on various factors, including cost, availability, and the specific requirements of the crane system. Galvanized steel, copper, and stainless steel are all suitable materials for conductor bars, each offering unique advantages.
It is important to note that conductor bars have some disadvantages. For example, they cannot be used in environments that require explosion-proof cranes, and they may require frequent servicing or replacement of collector shoes depending on the severity of use.
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A festoon system organises cable and allows it to stack without twisting
Electrifying a crane is a complex process with many components to consider. One of the most vital units of a crane and hoisting system is the electrification system. A festoon system is one such system, used to transfer power from the building supply to the crane runway.
Festoon systems are commonly used in overhead cranes, jib cranes, port cranes, and other material handling applications. They are very stable and can be used in both indoor and outdoor applications, even in high temperatures and other demanding conditions. They can also be used to safely power and control explosion-proof cranes.
Festoon systems are easy to maintain and operate, with a straightforward design. They can be set up with basic models to handle light cables or customised with complex cable packages for heavier-duty purposes. They may also utilise "plug and play" electrical connections, making installation simple.
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Trenches are best for running electricity under a garage door
Trenches are the best option for running electricity under a garage door. This method is preferred over cable protectors or cable ramps, which can be a trip hazard and are not suitable for forklifts. Trenches are usually cast in concrete with a recess for a steel cover plate, allowing floor loads to pass over.
If you are unable or unwilling to cut into your floor for trenching, there are other options. You could use individual jib cranes or bridge cranes with crane coverage over the machine, except for the electrical cabinet. Another option is to run conduit under the floor and then run wires overhead, moving switch boxes to the walls.
However, if trenching is your preferred option, there are several steps you should take. First, contact your local building department to determine the necessary permits and inspections for running underground wiring to your garage. Most jurisdictions require electrical permits for this type of work. It is also important to contact your local utility company to mark underground pipes and wires to prevent accidental damage and ensure worker safety.
Once you have the necessary permits and inspections, you can begin digging the trench. It is recommended to rent a gas-powered trenching machine to reduce manual labor. The trench should be at least 12 inches deep from the house to the garage. After digging the trench, lay the UF (underground feeder) cable, which can withstand direct burial and moisture exposure due to its waterproof sheathing.
At both the house and garage ends, install a three-quarter-inch-diameter plastic conduit to protect the cable where it emerges from the ground and enters the structures. Use a propane heat gun to bend the conduit to conform to the foundation or wall contours. Feed the cable to ensure it reaches from the electrical panel to the desired location. Finally, make the necessary wire connections at the main electrical panel, either by a licensed electrician or yourself if you have basic electrical skills.
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A festoon electrification system uses flat or round cable on a trolley
Electrifying a crane is a complex process with several options for the electrification system. One such system is the festoon electrification system, which uses flat or round cable on a trolley. This system is distinguished by its speed, weight, and range of motion, and is suitable for both indoor and outdoor applications, as well as high-heat environments.
The festoon system organises cable in a stacked and untwisted manner, with trolleys accommodating multiple layers of cable. It is simple to maintain and operate, and can be customised for various applications. The system is hard-wired to operate in harsh or extreme temperatures and environments. Installation is simple and easy, with "plug and play" electrical connections made of male and female pin connector sets.
The festoon system has a non-moving end clamp component, which is installed at the fixed end of the C-track. The track hanger suspends the C-track from cross-arm support channels, and a cable trolley is required for each flat cable loop. The cable trolley carries the electrical cable down the C-track.
Festoon electrification systems are most commonly found on bridge cranes, but can also be used on other types of cranes such as gantry cranes, monorail cranes, and jib cranes. They are a good option for crane setups where future upgrades or expansions may be considered, as they are easy to connect and extend.
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Frequently asked questions
Electric cranes can be single girder cranes, double girder bridge cranes, gantry cranes, or EOT cranes.
Cable festoons, conductor bars, or cable reels are used to transfer power from the building supply to the crane.
Festoon systems are easy to maintain, have a straightforward design and operation, and can be configured in basic economic designs or customized for heavier-duty applications.
Collector shoes can wear out and need to be serviced or replaced often. Conductor bar systems also cannot be utilized in an environment that requires an explosion-proof crane and should not be used to power transfer carts.
