A vehicle with a valid certificate and a vehicle designed to ensure safe working conditions for the patient and paramedics are not always the same ambulance. Certification confirms compliance with minimum requirements, but it is the specific design solutions of the patient compartment that determine what happens during an emergency response. This article describes which conversion elements directly translate into safety, what the EN 1789:2024 standard specifically requires, and how to verify these parameters prior to vehicle handover from the manufacturer.
EN 1789:2024 as a Safety Benchmark
The EN 1789:2020+A1:2024 standard — implemented in Poland as PN-EN 1789 — specifies requirements concerning the design, performance, and equipment of road ambulances. Its scope is broader than medical equipment alone. The standard covers:
- vehicle driving parameters and performance — requirements regarding acceleration, braking, and traction control under operational conditions
- fire protection of the vehicle and the patient compartment
- minimum working space dimensions in the compartment and requirements for patient access from several positions simultaneously
- the oxygen system — number of cylinders, storage conditions, and oxygen-compatible materials
- the mounting system for medical equipment and devices, the strength of which is verified by 10G testing
- electromagnetic compatibility (EMC) of all systems installed in the vehicle
- protection of electrical connectors — a minimum IP44 protection rating with connection status indication
This is the European minimum — the baseline for every ambulance authorised for road use in the EU, not a comprehensive operational specification. Individual operators and national authorities may require standards higher than EN 1789, which is fully permissible.
Strength Testing — What 10G Means for Equipment Mounting
EN 1789 requires static, dynamic, and crash testing during which equipment mountings must withstand a load ten times the force of gravity. This requirement applies to medical cabinets, the stretcher mounting system, and all devices installed in the compartment. In the event of a road collision, improperly secured medical equipment moves with a force many times greater than its static weight — becoming a hazard to the patient lying on the stretcher and to the paramedics working inside the compartment.
The 10G test reports should be available upon request from any manufacturer declaring compliance with the standard. If a manufacturer is unable to provide them, it is a signal requiring further verification.
Working Space — A Normative Requirement, Not a Matter of Comfort
EN 1789 defines the minimum internal dimensions of the patient compartment to ensure the simultaneous work of at least two paramedics attending to a patient lying on a stretcher. Access to the patient must be possible from several positions.
The standard treats this space as a safety requirement — not a matter of comfort. A compartment in which one paramedic must step aside to make room for another does not meet this criterion. Verification takes place during a physical inspection of the vehicle prior to handover.
Patient Safety — What Determines the Quality of the Treatment Environment
Surfaces and Sealing — Hygiene as an Element of Biological Safety
The patient compartment must feature smooth, impermeable surfaces that are easy to clean and disinfect. Joints and connections must be tightly sealed in a manner that prevents fluid ingress and biofilm formation. EN 1789 treats this as a safety requirement, not a finishing detail.
A conversion made of materials that are difficult to disinfect or featuring improperly sealed joints accumulates pathogens regardless of cleaning frequency — an effect invisible to the naked eye, yet very real over prolonged use with a high patient turnover. When purchasing, it is worth asking the manufacturer about the joint execution method and the sealing materials used.
The Oxygen System — EN 1789 Requirements in Practice
The standard requires at least two oxygen cylinders or a manifold system. The cylinders must be stored in a ventilated, protected compartment. The installation includes a pressure regulator, flowmeters, and outlets located within the access zone. All materials coming into contact with oxygen must be compatible with it — this is not a discretionary requirement, but a matter of fire safety.
Access to the cylinders should be possible from outside the vehicle without entering the patient compartment. This allows cylinders to be replaced or replenished between calls without interrupting work inside — and eliminates the need to enter an occupied compartment. Each cylinder should be removable individually, without dismantling the remaining equipment in the storage compartment.
Pressure monitoring in the oxygen system should be accessible from the central control panel, without the need to inspect the installation directly.
The Lighting System — Three Functions, One Design
EN 1789 requires three types of lighting: general compartment lighting, examination lighting, and external scene lighting. Each serves a different purpose and has distinct requirements regarding illuminance and the arrangement of light sources.
A crucial solution is the ability to adjust lighting externally — via remote controls located near the doors — without having to enter the patient compartment. Under night-time and adverse weather conditions, controlling lighting without physically stepping inside limits unnecessary exposure and shortens the operation time of vehicle systems.
Crew Safety — Control, Signalling, and Ergonomics
A Single Control Point for All Systems
A paramedic attending to a patient should not have to leave their position to adjust the lighting, change power parameters, or check the status of the oxygen system — all these systems should be accessible from a single location. A medical conversion meeting this requirement minimizes unnecessary movement within the compartment during an active response. Every such movement generates risk — particularly during dynamic driving.
The control panel in the driver’s cab should provide full access to emergency audio-visual warnings. The driver manages the sirens and emergency priority lighting independently, without needing to involve a second person from the rear of the vehicle.
IP44 Electrical Connectors with LED Indication — Power Protection Under Operating Conditions
An IP44 protection rating indicates resistance to the ingress of solid objects greater than 1 mm in diameter and to water splashing from any direction. In an ambulance, this is vital in daily operation: washing the compartment using pressurized water, rain with open doors during a call, or working in harsh weather conditions. A connector failing to meet the IP44 standard may sustain damage upon contact with moisture — which, during patient transport, means a loss of power to connected medical equipment.
LED indication at the connectors serves a distinct function. It displays connection status without the need for physical inspection — which is important when working in poor lighting and while wearing protective gloves. The paramedic can see whether device power is active without manually checking the connections.
Electromagnetic Compatibility — Why Systems Must Work Together
In emergency vehicles equipped with advanced medical gear — defibrillators, vital signs monitors, infusion pumps, ventilators — all devices operate simultaneously within a confined space. EN 1789 requires the medical conversion to meet electromagnetic compatibility requirements: no system may cause interference with the operation of others, nor disturb the electronics of the base vehicle.
EMC interference in an ambulance environment can have direct operational consequences — ranging from distorted monitor readings to disruption of communication with the medical dispatcher. The EN 1789 requirement means that the manufacturer is obligated to verify the EMC compliance of the entire conversion as a system, rather than individual devices separately. Meeting this requirement is part of the certification process leading to CE marking for the medical conversion.
Seatbelt Monitoring System
EN 1789 specifies requirements regarding seat mountings, seatbelt anchorages, and their layout within the patient compartment. Complementing these structural requirements is an unfastened seatbelt warning system — a solution informing the driver in real time if any seatbelt in the patient compartment remains unfastened.
In practice, the signal reaches the driver without requiring verification by the second paramedic. This is particularly important when transporting a patient requiring continuous care, when the attending paramedic cannot interrupt their work.
CE Marking — What It Confirms and What It Does Not Guarantee
An ambulance meeting the requirements of EN 1789:2024 receives CE marking for its integrated medical systems — the stretcher retention system, the oxygen installation, and the electrical power supply. The marking confirms the compliance of these systems with the relevant EU health, safety, and environmental protection requirements.
CE marking is a mandatory prerequisite for purchase — but insufficient as the sole measure of conversion quality. It confirms that the conversion has undergone the required conformity assessment procedure and meets the normative baseline. It does not confirm the quality of materials or solutions exceeding this baseline, nor the durability of a specific design under intensive operating conditions. These matters cannot be deduced from the CE marking — they must be verified through the manufacturer’s documentation and inquiries made during the handover stage.
After-Sales Service — Safety Throughout the Lifecycle
The EN 1789 standard specifies requirements regarding the design and equipment of an ambulance at the time of delivery. However, medical conversion systems — the oxygen system, electrical setup, stretcher mountings — require regular servicing throughout the vehicle’s operational life. Safety built into the conversion during production degrades without proper technical maintenance.
A full service scope includes regular inspection of all integrated patient compartment systems, conversion repairs, diagnostics of stretcher mounting setups and loading systems, the possibility of upgrading the vehicle with additional systems post-purchase, as well as assistance in locating authorised base-vehicle service centres and diagnosing whether a fault pertains to the conversion or the chassis. A holistic approach to after-sales support means the operator has a single point of contact for technical issues, regardless of their source.
A vital component is a 24/7 service hotline. A failure of a safety system — seatbelt warning, control panel, oxygen pressure monitoring — outside standard service hours does not have to mean taking the vehicle out of the fleet for several days. Rapid telephone diagnosis allows operators to assess whether the vehicle can continue operating until a scheduled repair or requires immediate service intervention.
What to Verify When Purchasing an Ambulance Regarding Safety
| Parameter | Verification method |
| EN 1789:2024 certificate | Valid document issued by a notified body; date of issue |
| 10G test reports | Available upon request from the manufacturer — cabinet, stretcher, and equipment mountings |
| CE marking of the medical conversion | Declaration of conformity for the stretcher retention system, oxygen setup, and electrical installation |
| EMC compliance of the medical conversion | Confirmation in certification documentation; inquiry to the manufacturer regarding the EMC test scope |
| Central control point | Demonstration during handover — which systems are accessible from a single location |
| Unfastened seatbelt warning system | Confirmation of operation on every seat during technical handover |
| Driver access to audio-visual warnings | Verification in the driver’s cab during handover |
| IP44 electrical connectors with LED indication | Physical inspection of connectors; verification of protection rating in technical documentation |
| Oxygen system monitoring from the panel | Demonstration of pressure readings from the control panel |
| Externally controlled lighting | Demonstration of lighting adjustment without entering the compartment |
| External access to oxygen cylinders | Inspection of the left external storage compartment; ability to remove each cylinder individually |
| Joint sealing and surface finish | Inquiry to the manufacturer regarding materials and joint sealing method |
| 24/7 service and hotline | Confirmation of after-sales support scope and terms in the service agreement |
Ambulance safety begins with the conversion design, rather than the list of medical equipment. The EN 1789:2024 standard defines minimum structural requirements — from 10G strength testing, through EMC requirements and IP44 protection of electrical connectors, to working space for two paramedics simultaneously. The certificate and CE marking confirm compliance with these baseline requirements at the time of delivery — but the safety of integrated systems requires maintenance throughout the vehicle’s lifecycle.
FAQ
EN 1789:2024 defines the European minimum construction and equipment requirements for road ambulances. The certificate confirms that the vehicle has undergone the required conformity assessment procedure and meets these minimum requirements. Individual operators and national authorities may require standards higher than this benchmark — the standard specifies the minimum entry threshold, not a quality ceiling.
10G testing consists of static, dynamic, and crash strength tests that the mountings of cabinets, stretchers, and medical devices installed in the compartment must pass. They confirm that in the event of a road collision, secured equipment will not shift in a manner posing a threat to the patient or crew. A positive test result is one of the conditions for obtaining CE marking for an ambulance medical conversion.
Patient safety is determined primarily by: the impermeability and disinfectability of compartment surfaces, a properly designed oxygen system with external cylinder access, certified stretcher mounting withstanding 10G loads, and secure retention of medical equipment. Crew safety stems from control and ergonomic solutions: a central panel operating all systems, unfastened seatbelt warnings, driver access to audio-visual warnings, IP44 protection of electrical connectors, EMC compliance of all systems, and the ability to control lighting without entering the compartment. Both areas are addressed by EN 1789 as minimum requirements.
Handover should include verifying the completeness of documentation — the EN 1789 certificate, CE declaration of conformity, completed vehicle type approval — demonstrating the operation of the central control panel, testing the unfastened seatbelt warning system on every seat, checking externally controlled lighting, inspecting electrical connectors for IP44 compliance, and inspecting the external oxygen cylinder storage compartment. The manufacturer should be able to provide 10G test reports and EMC documentation without requiring a written application.
