How to Choose a Jib Crane When Only Single-Phase Power Is Available?

• event Jun 18, 2026

Introduction

Recently, Yuantai Crane received an inquiry from a customer operating a mechanical manufacturing workshop in Australia. The requirement was straightforward on the surface, but in practice, it raised a very common engineering challenge in industrial lifting systems: how to balance crane performance with limited site power conditions.

The customer was looking for a 4 ton pillar jib crane with a lifting height of 5 meters, a 4 meter working radius, and 360-degree rotation. The crane would be used for lifting mechanical components within a production workshop environment, which typically involves regular handling of heavy fabricated parts, assemblies, and maintenance operations.

At the same time, the customer’s available power supply at the site was 240V / 50Hz / single-phase, which immediately became the key constraint in system design.

This type of inquiry is not unusual, especially in workshops where electrical infrastructure has not yet been upgraded to a full three-phase system.

The Core Challenge: Performance Requirements vs. Power Limitation

On paper, the requested jib crane configuration is a standard industrial setup:

• 4 ton lifting capacity
• 5m lifting height
• 4m radius
• 360° rotation

However, the critical factor is not the geometry or capacity—it is the power supply configuration behind the lifting and slewing system.

In general, industrial jib cranes with motorized functions are designed around three-phase power systems, which provide:

• Stable voltage under load
• Higher efficiency for motor operation
• Better handling of starting current
• Smoother performance for slewing and hoisting operations

In contrast, a single-phase supply is commonly used in light industrial or workshop environments, but it has limitations when it comes to powering multiple motor-driven crane functions simultaneously.

This creates a design decision point: should the system be adapted to the power source, or should the power system be upgraded to match the crane?

Option 1: Pillar Jib Crane with Manual Rotation (Single-Phase Solution)

For sites where only single-phase power is available and upgrading the electrical infrastructure is not immediately feasible, the most practical and widely used solution offered by Yuantai Crane is a pillar mounted jib crane with manual rotation combined with a single-phase electric chain hoist.

In this configuration:

• The hoisting is electrically powered (single-phase compatible)
• The jib arm rotation is manual (360° rotation via bearing support)

Although the term “manual rotation” sometimes raises concerns for users expecting full automation, in practice, a well-designed jib crane slewing system is highly efficient. The rotation is smooth, and the operator can easily position heavy loads with minimal physical effort due to the mechanical advantage of the slewing bearing system.

For the Australian workshop scenario, this solution offers several advantages:

• Fully compatible with 240V single-phase supply
• Lower installation complexity
• Reduced electrical load requirements
• Lower maintenance requirements over time
• High reliability in continuous workshop environments

For many mechanical workshops, this configuration is often the most balanced and cost-effective choice.

Option 2: Single-Phase portable gantry crane as an Alternative

In some cases, customers who initially consider a jib crane also evaluate whether a portable gantry crane could better suit their workflow.

A single-phase gantry crane offers:

• Mobility across different working areas

• No fixed foundation requirement

• Compatibility with 240V single-phase power

• Flexibility for multi-station lifting tasks

In workshop environments where lifting points are spread across different zones or where floor-mounted installation is not ideal, a gantry crane can sometimes be a more practical solution than a fixed pillar jib crane.

However, compared to a jib crane, it typically requires more floor space and is less efficient for repetitive lifting within a fixed radius.

Option 3: Fully Motorized Jib Crane with Three-Phase Power Supply

If the customer's operational requirement strongly emphasizes motorized 360° slewing, then the system design naturally shifts toward a three-phase powered jib crane configuration, which is also a standard solution provided by Yuantai Crane.

In this case, both the hoisting and slewing mechanisms are electrically driven, offering:

• Fully motorized load positioning

• Higher efficiency for frequent lifting cycles

• Reduced operator involvement in rotation

• Better suitability for production-line workflows

However, this configuration requires a stable three-phase power supply (or equivalent generator system) to ensure reliable operation.

Can a Three-Phase Generator Be Used Instead?

The customer also asked whether a three-phase generator could be used to power the jib crane system.

The answer is yes. A three-phase generator can be used to run both the hoisting and slewing motors, provided that the system is properly matched.

However, the feasibility depends heavily on engineering selection.

Key factors include:

1. Generator rated capacity (kVA)
2. Hoist motor power
3. Slewing motor power
4. Starting current of electric motors
5. Duty cycle and operating frequency
6. Voltage and frequency stability

In industrial lifting applications, the generator must not only support running power but also handle motor starting surges, which are significantly higher than steady-state operation.

Engineering Recommendation for This Case

Considering the Australian customer's actual conditions:

• 4 ton lifting capacity
• 4m working radius
• 5m lifting height
• 240V single-phase available on site
• Preference for motorized rotation
• Possible use of generator power

The most practical engineering recommendation from Yuantai Crane is:

Primary Solution (Recommended):

A pillar mounted jib crane with a 4 ton electric chain hoist powered by single-phase supply, combined with manual 360° rotation.

This ensures:

• Full compatibility with existing power infrastructure
• Stable and safe operation
• Lower long-term operating complexity

Alternative Solution (If motorized rotation is essential):

Upgrade to a three-phase power system or use a properly sized three-phase generator system designed to match the crane load requirements.

Conclusion: Power Supply Defines the Real Crane Solution

In industrial crane selection, it is easy to focus on lifting capacity, arm length, and rotation angle. However, in real engineering practice, power availability is often the defining constraint that determines the final configuration.

This Australian inquiry clearly reflects a common global situation in mechanical workshops: the need for heavy-duty lifting performance within limited electrical infrastructure.

At Yuantai Crane, we do not only supply standard crane products. Instead, we evaluate the actual working environment—including power supply conditions, lifting frequency, and operational requirements—to provide a solution that is both technically feasible and economically practical.