MEV®-8 Insulation Monitoring Equipment for Medical IT Systems
MEV®-8 provides continuous insulation monitoring for medical IT systems, ensuring uninterrupted power during the first fault, early detection of insulation failures, and maximum electrical and patient safety.
How the MEV®-8 Insulation-level Monitoring System works:
The operating room’s electrical power network is separated from the public grid by a medical isolation transformer.
The MEV®-8 system continuously monitors all electrical devices connected to this transformer.
It supervises:
- insulation resistance of the IT system
- transformer load
- transformer temperature
- Protective Earth (PE) continuity – 24/7
- The system detects faults and abnormal conditions early, preventing dangerous situations from arising.
A modern system according to the IEC/EU standard
Mandatory: Insulation Monitoring Device
Monitors the insulation of a floating IT network (leakage current), transformer load (current A) and temperature (°C)
Mandatory: System Monitoring Panel
Indicates any insulation level alarms, line controller alarms, and test lead faults as well as transformer overloading and temperature alarms.
Recommendation: Protective Earth (PE) conductor continuity monitoring device
Monitors the continuity of the Protective Earth (PE) conductor in a floating medical IT network.
Recommendation: Insulation fault Locator
Identifies and locates insulation faults in a floating medical IT network — quickly and accurately, without interrupting clinical operations.
MEV®-8 System Overview
MEV-8 Insulation monitoring device (Core unit)
Mandatory according to standards
Continuous Insulation Monitoring for Medical IT Systems
The MEV®-8 is the core safety unit of the medical IT system. It continuously monitors the insulation resistance of a floating IT network (leakage current) and provides early warning of incipient insulation faults before they develop into a safety risk.
In addition to insulation monitoring, MEV-8 supervises:
- Transformer load (A)
- Transformer temperature (°C)
- System status and alarms — for immediate response in critical areas
Why MEV-8 is essential
- Ensures an uninterrupted power supply during the first fault
- Allows safe fault localisation without interrupting clinical work
- Reduces the risk of electric shocks, electrical fires and equipment malfunction
- Supports the reliable operation of sensitive biomedical equipment
- Protects both patients and personnel from electrical hazards
- Prevents unnecessary downtime
- Extends the service life of surgical and medical equipment
The MEV®-8 is designed for 24/7 continuous operation in the most demanding medical environments and forms the central safety unit of the entire MEV®-8 system.
Standard compliance:
IEC 60364-7-710 · IEC 61557-8 · IEC 61557-9
SP-8 – System Monitoring Panel (Alarm Indication Panel)
Mandatory according to standards
Clear and Immediate System Status Visibility for Clinical Staff
The SP-8 system monitoring panel provides centralised visual and audible alarm indication for the medical IT system. It ensures that both clinical and technical staff are immediately informed of any abnormal system condition.
SP-8 indicates:
- Insulation level alarms
- PE conductor continuity (LC-8) alarms
- Test lead faults
- Transformer overload
- Transformer temperature alarms
Why SP-8 is essential
- Ensures immediate awareness of the electrical system status
- Supports a rapid and controlled response to developing faults
- Improves patient safety and operational reliability
- Acts as the primary user interface between the medical IT system and hospital staff
- Enables safe and uninterrupted operation of operating rooms and ICUs
The SP-8 is designed for continuous 24/7 operation and is typically installed in operating rooms and technical control areas.
LC-8 – PE Conductor Continuity Monitoring Device (Line Controller)
Not required by the standard, but strongly recommended
Continuous Protective Earth (PE) Monitoring – 24/7
A medical IT system ensures an uninterrupted power supply during a first fault, while also reducing electromagnetic interference (EMI) affecting sensitive biomedical equipment.
Electromagnetic interference (EMI) can cause medical monitors and other hospital devices to malfunction. The consequences of such malfunctions can range from minor disturbances to serious patient safety risks.
Continuous Protective Earth (PE) monitoring is essential for:
- maintaining controlled and reliable grounding
- suppressing interference currents (EMI)
- ensuring both electrical safety and measurement reliability
- preventing undetected loss of protective grounding
- guaranteeing that insulation monitoring can function correctly
LC-8 continuously supervises the integrity of the PE conductor from the distribution board to the last socket outlet — 24/7, automatically and without manual testing.
FI-8 – Insulation Fault Locator Unit
Not required by the standard — but strongly recommended by PPO
Fast and Accurate Fault Localisation in Medical IT Networks
The FI-8 identifies and locates insulation faults in a floating medical IT network — quickly and accurately, without interrupting clinical operations.
Why FI-8 matters
- Enables fast fault localisation without shutdowns
- Reduces troubleshooting time and maintenance costs
- Minimises downtime in critical medical areas
- Improves maintenance efficiency
- Increases overall system reliability
- Supports the safe and continuous operation of operating rooms and ICUs
Why Continuous PE Continuity Monitoring Matters – 24/7
The new-generation MEV system includes continuous monitoring of Protective Earth (PE) continuity.
This enables round-the-clock 24/7 supervision of the grounding path, helping to:
- Prevent dangerous hidden faults
- Reduce manual inspection costs
- Maintain controlled grounding
- Support EMI suppression
- Ensure reliable insulation monitoring
If the PE conductor is broken or disconnected, insulation monitoring cannot function reliably.
A missing or faulty PE conductor may also prevent the automatic operation of protective devices, increasing the risk of electric shock and equipment malfunction.
Background, Compliance & Development of the MEV®-8 System
The MEV®-8 insulation monitoring system safeguards electrical safety in Group 2 medical locations, such as operating rooms and ICUs, where defective electrical equipment can cause serious incidents.
For more than 45 years, MEV systems have helped protect patients, personnel and valuable medical equipment in Finnish hospitals.
The current fifth-generation MEV®-8 system has been developed in close cooperation with hospital engineers and international partners. It fully complies with all key global standards, including IEC 60364-7-710, IEC 61557-8 and IEC 61557-9, which mandate insulation monitoring in medical IT systems.
The new-generation MEV® system meets international market requirements without compromising durability or reliability.
Key advancements include:
- FI-8 insulation fault localisation
- LC-8 continuous PE continuity monitoring
These features enable safety levels beyond basic standard compliance.
Key Benefits for Hospitals
- No power interruption during the first fault
- Safe fault localisation
- Reduced shock and fire risk
- Reliable biomedical measurements
- Less downtime
- Longer equipment lifetime
- Lower lifecycle costs
Quality, Reliability & Track Record
Why Choose the MEV®-8 System?
Designed and manufactured in Finland
- Finnish engineering, long-term subcontractors
- Every device is 100% tested before delivery
- Durable, reliable and built for medical Group 2 locations
45 years of experience & proven performance
- Five generations of medical insulation monitoring since 1981
- Over 33,000 devices delivered
- Many systems from the 1990s still in use today -> Clear evidence of long lifecycle and trusted quality
MEV®-8 is a sustainable solution
- 24/7 insulation monitoring
- 24/7 Protective Earth (PE) continuity monitoring
- IEC 60364-7-710 / 61557-8 / 61557-9 compliant
- Long lifecycle with low maintenance
- Comprehensive training + responsive remote support
The MEV®-8 system forms a complete safety ecosystem
A fully supervised medical IT safety system that not only meets international standards, but goes beyond them to maximise:
Patient safety · System reliability · Uptime · Long-term performance
Some examples of our projects in Finland
| HOSPITAL | PROJECT NAME | LOCATION | YEAR | DEVICES |
| HUS University Hospital | Meilahti / Angio (T-part) | Helsinki | 2025 | MEV-8 |
| Terveystalo, Kamppi (Private) | Operating rooms | Helsinki | 2025 | MEV-8 |
| HUS University Hospital | Meilahti / OR Department (A-part) | Helsinki | 2024 | MEV-8 |
| Central Ostrobothnia / Central Hospital | New OR Department | Kokkola | 2023 | MEV-8 |
| Oulu University Hospital (OYS) | OYS TULSA 2030 | Oulu | 2021–2022 | MEV-8 |
| HUS University Hospital | Park Hospital | Helsinki | 2020 | MEV-7 |
| Central Finland Health Care District | Hospital Nova of Central Finland | Jyväskylä | 2020 | MEV-7 |
| Kymenlaakso Central Hospital | Carea G-building | Kotka | 2020 | MEV-8 |
| Central Ostrobothnia Hospital District | Kokkola, Operating rooms | Kokkola | 2020 | MEV-7 |
| HUS University Hospital | Emergency Unit in Lohja hospital | Lohja | 2020 | MEV-8 |
| Kainuu Central Hospital | Kainuu New Hospital | Kajaani | 2019 | MEV-7 |
| HUS University Hospital | New Children’s Hospital Meilahti | Helsinki | 2018 | MEV-7 |
Finnish hospitals still have older generations of equipment, such as MEV-4, in their operating rooms. This shows that our MEV system is durable, reliable, and long-lasting. Constant quality control and meticulous manufacturing ensure the quality and reliability of our equipment.
Contact information
Managing Director Timo Ohtonen
More detailed information about techniques
Kimmo Konttinen, tel. +358 9 566 0920 or ppo@ppo-elektroniikka.fi
Our MEV team is specialised in medical insulation monitoring
Our MEV® team has 45 years of experience in insulation monitoring. PPO-Elektroniikka Oy is a reliable partner. We have received the highest possible Dun & Bradstreet Creditworthiness Classification and the highest credit rating by Asiakastieto.
PPO-Elektroniikka Oy is a member of the Association of Finnish Hospital Engineering.
Articles in International Publications
Our experts have contributed to several international publications in healthcare engineering, focusing on electrical safety, insulation monitoring, and operating room infrastructure.
IFHE Digest
Published annually by the International Federation of Hospital Engineering
- IFHE Digest 2026 / Sivut 71-73. Electrical safety in critical care: Global insights
into medical insulation monitoring. - IFHE Digest 2024 (pages 68-72) Raising safety standards in healthcare facilities
- IFHE Digest 2022 (pages 68-70). Training operating room staff in electrical safety
- IFHE Digest 2019 (pages 19-22). Operating rooms and their electrical safety
- IFHE Digest 2017 (pages 51-53): Insulation monitoring in operating rooms
HEJ Healthcare Estate Journal 9/2020: Insulation monitoring brings safety and cost-savings Pages 69-72 / Authors Mr Timo Ohtonen and Mr Petri Pelkonen
We are happy to give more information about our MEV® Insulation Monitoring System and electrical safety in medical G2 premises.
MEV® is a registered trademark of PPO-Elektroniikka Oy.
MATERIALS
Frequently Asked Questions – MEV®-8 Insulation Monitoring System
What is an insulation monitoring system in medical IT networks?
An insulation monitoring system continuously supervises the insulation resistance of a floating medical IT power network. In critical areas such as operating rooms and ICUs, it ensures electrical safety by detecting insulation faults early—without interrupting the power supply during the first fault.
Why is insulation monitoring mandatory in operating rooms and ICUs?
Insulation monitoring is required by international standards (IEC 60364‑7‑710, IEC 61557‑8, IEC 61557‑9) because power interruptions or undetected insulation failures in Group 2 medical locations can cause serious patient safety risks, equipment malfunction, or fire hazards.
What is the MEV®‑8 insulation monitoring system?
The MEV®‑8 insulation monitoring system is a complete medical IT safety solution designed for continuous 24/7 operation. It monitors insulation resistance, transformer load, transformer temperature, and system alarms to ensure maximum electrical and patient safety in critical medical environments.
How does the MEV®‑8 insulation monitoring system work?
The medical IT network is isolated from the public grid using a medical isolation transformer.
The MEV®‑8 insulation monitoring device continuously supervises:
- Insulation resistance (leakage current)
- Transformer load (A)
- Transformer temperature (°C)
- Protective Earth (PE) continuity (with LC‑8)
Any abnormal condition is detected early, preventing hazardous situations.
What makes the MEV®‑8 an essential insulation monitoring device?
The MEV®‑8 is the core insulation monitoring device of the medical IT system. It:
- Ensures uninterrupted power during the first fault
- Provides early warning of insulation failures
- Allows safe fault localisation without shutting down clinical work
- Protects patients, staff, and sensitive biomedical equipment
What happens during the first insulation fault?
In a properly monitored medical IT system:
- Power remains uninterrupted
- The insulation monitoring system immediately generates an alarm
- Clinical procedures can continue safely
- Maintenance staff can locate and fix the fault without urgency or shutdown
What is the difference between insulation monitoring and fault localisation?
- Insulation monitoring detects that a fault exists
- Fault localisation identifies where the fault is
The optional FI‑8 insulation fault locator enables fast and accurate fault localisation without interrupting medical operations.
Why is continuous Protective Earth (PE) monitoring important?
Continuous PE monitoring ensures that the grounding path remains intact at all times. A broken or disconnected PE conductor can:
- Prevent reliable insulation monitoring
- Increase the risk of electric shock
- Cause malfunction of protective devices
- Increase electromagnetic interference (EMI)
What is the LC‑8 PE continuity monitoring device?
The LC‑8 continuously monitors the continuity of the Protective Earth (PE) conductor from the distribution board to the last socket outlet—24/7 and automatically, without manual testing. While not mandatory by standard, it is strongly recommended for maximum safety.
What is the SP‑8 system monitoring panel?
The SP‑8 system monitoring panel is the mandatory alarm indication interface for clinical staff. It provides clear visual and audible alarms for:
- Insulation level faults
- PE continuity alarms
- Transformer overload
- Transformer temperature
- Test lead faults
Where is the SP‑8 typically installed?
The SP‑8 is usually installed:
- In operating rooms
- In ICUs
- In technical control areas
It ensures immediate awareness of electrical system status for both clinical and technical personnel.
How does insulation monitoring improve patient safety?
Continuous insulation monitoring:
- Prevents electric shock risks
- Reduces fire hazards
- Ensures reliable biomedical measurements
- Supports uninterrupted clinical procedures
- Protects vulnerable patients during critical care
Does the MEV®‑8 comply with international standards?
Yes. The MEV®‑8 insulation monitoring system fully complies with:
- IEC 60364‑7‑710
- IEC 61557‑8
- IEC 61557‑9
These standards mandate insulation monitoring in medical IT systems used in Group 2 medical locations.
What are the main benefits of the MEV®‑8 insulation monitoring system for hospitals?
Key benefits include:
- No power interruption during the first fault
- Early detection of insulation failures
- Reduced risk of shock and electrical fires
- Less downtime in operating rooms
- Longer lifetime of medical equipment
- Lower lifecycle and maintenance costs
Why choose MEV®‑8 over other insulation monitoring systems?
MEV®‑8 stands out due to:
- 45+ years of medical insulation monitoring experience
- Finnish design and manufacturing
- Proven long lifecycle (many systems still in use after decades)
- 100% factory testing
- Continuous insulation and PE monitoring
- Support for fault localisation without shutdowns
Is the MEV®‑8 system suitable for future hospital upgrades?
Yes. The MEV®‑8 system is designed as a scalable safety ecosystem that supports modern hospital requirements, international compliance, and long-term reliability—making it suitable for both new hospitals and retrofit projects.
