Temporary distribution boxes are indispensable at construction sites, events and temporary workplaces. Yet things often go wrong when installing or renting these installations, resulting in risks to safety, continuity and legal compliance. In this article you will read about the five most common mistakes when installing temporary distribution boxes and practical tools to avoid them. Whether you are an installer yourself or responsible for rental, these insights will help you get ahead of problems.
Why temporary distribution boxes require special attention
Temporary distribution boxes ensure that electrical energy is distributed safely and efficiently in locations lacking a permanent connection. Due to their temporary nature and intensive use, correct installation and inspection is important. Errors can lead to failure, property damage or even dangerous situations for users and bystanders.
Common mistakes with temporary distribution boxes
Incorrect on-site placement
Example of an error
A distribution box is installed where it is not protected from weather conditions, mechanical damage or unauthorized access.
Impact
- Short circuit or electrical failure due to moisture or dust ingress
- Unintentional failure due to collisions with machinery or passersby
- Unauthorized acts by unauthorized persons
How do you prevent this?
- Always place distribution boxes out of direct reach of vehicles and equipment.
- Provide dry, stable ground and sufficient distance from water streams or mud.
- Use concrete or plastic protection around the cabinet whenever possible.
Installation overload
Example of an error
The total power of connected machines is underestimated while additional users are added after installation.
Impact
- Automatic fuses blow, resulting in interruptions.
- Overheating of pipes can cause melting or fire hazards.
- Unnecessary wear and tear on components.
How do you prevent this?
- Make a power calculation in advance based on the expected maximum simultaneous usage.
- Allow for possible expansions during the period of use.
- Choose a distribution box with sufficient margin above the calculated power.
Improper or poor grounding
Example of an error
A temporary distribution box is placed on metal plates without adequate grounding, or control measurements are lacking at commissioning.
Impact
- Danger to life if electrical currents flow into the housing.
- Failure to comply with NEN 1010/ NEN-EN 61439 legislation.
How do you prevent this?
- Before commissioning, always check that the grounding pin is correctly positioned and connected.
- Measure the earth diffusion resistance and record it in writing.
- Repeat this check each time the cabinet is moved.
Incorrect or incomplete documentation
Example of an error
Documentation is missing or incomplete; for example, no overview of connected groups or no inspection report available on site.
Impact
- Difficult inspections and failure analysis.
- Risk of fines when inspected by regulators.
- Uncertainty among multiple stakeholders.
How do you prevent this?
- Always supply an up-to-date list of groups and loads when installing.
- Keep the latest inspection report in a clearly marked folder near or in the distribution box.
- Update documentation immediately after changes or maintenance.
Inadequate monitoring or periodic maintenance
Example of an error
After installation, the distribution box is only looked at in case of malfunctions; periodic visual inspections and testing do not take place.
Impact
- Defects are noticed too late, resulting in failure or damage.
- Defective operation of protective devices or ground fault circuit breakers.
- Invisible wear and tear can escalate into dangerous situations.
How do you prevent this?
- Immediately upon installation, establish a maintenance and inspection plan appropriate to the duration and intensity of use.
- Perform regular visual checks and some functional tests (including operation of ground fault circuit breakers).
- Record all findings in a maintenance log.
Practical tips for installers and landlords
- Always follow applicable standards such as NEN 1010 and NEN-EN 61439-4 for temporary electrical installations.
- Use only certified and periodically inspected distribution boxes.
- Provide in-house training to personnel, including recognizing risk factors at temporary installations.
- Make clear agreements between landlord and user regarding responsibilities for inspection, use and maintenance.
- Keep a checklist with each installation for installation, completion and periodic inspection.
Security and safety with temporary distribution boxes
Temporary distribution boxes are essential, but only when properly deployed and maintained. By being aware of the most common mistakes and actively preventing them, you minimize risk and maximize reliability and safety on the job site.
As an experienced electrical installation company in Helmond, we support the supply and installation of reliable temporary power supplies. Think of a customized switch box for specific applications or solutions for temporary heating of a large space, tailored to your situation.
Invest in clear procedures and regular inspections; this will keep your installation qualitative, safe and compliant. Would you like to know more? Then feel free to contact us.
