A minor fault in an office machine may cause a circuit breaker to trip. A minor fault in a patient care device in a hospital could cause serious harm to patients and staff.
Electrical safety testing of medical equipment is a standardized procedure for measuring electrical currents and testing equipment grounding. This is a typical part of medical equipment management that helps control invisible electrical hazards, ensure proper functionality of medical devices, and meet regulatory requirements.
This article discusses the nature of the tests, the timing of electrical safety testing, the difference between electrical safety testing and other types of electrical maintenance, and the ways in which a facility manager can ensure that their testing program is adequate.
What Is Electrical Safety Testing for Medical Equipment?
Electrical safety testing is generally the method of testing a medical device for safety against electrical shock hazards to both a patient and operator.
Since medical devices are typically electrical machines that often come into contact with a patient, the machine itself is designed in a manner that renders it highly immune to electricity-related hazards from the inside. However, as devices are subject to mechanical damage, degradation of internal components, or improper transportation, such safety features may be compromised.
Electrical safety testing is usually performed with special biomedical test equipment, referred to as electrical safety analyzers, to make sure that the device has sufficient grounding and does not let dangerous levels of electricity flow through it.
This testing is not merely a visual inspection. It requires that the voltage, resistance, and current be measured in order to verify that the equipment is operating safely within the limits as specified in the NFPA 99 (Health Care Facilities Code) and that of the manufacturer.
Why Is Electrical Safety Testing Important in Healthcare?
Medical equipment electrical safety testing is essential due to the healthcare setting in which it is used.
Patients in hospitals, surgery centers and clinics are particularly susceptible to electrical shock from misused or defective equipment. Patients may also be particularly vulnerable if they are anesthetized or otherwise unable to indicate discomfort and report the issue.
Furthermore, clinical procedures often circumvent the body’s natural electrical resistance. If a patient has an IV line, an invasive monitoring device, or ECG electrodes (“applied parts”), even a tiny amount of stray current can cause cardiac arrhythmia.
Beyond patient safety, routine electrical safety testing matters because:
- It protects clinical staff: Nurses and technicians are working with medical equipment on a regular basis. In many cases, they are working in dynamic or fluid-heavy environments. With intact electrical safety safeguards, care providers can be assured that they will not receive unintended electrocution shocks.
- It prevents downstream equipment failures: Grounding issues on one piece of equipment can lead to downstream electrical interference or damage to other pieces of sensitive medical imaging or patient monitoring equipment on the same circuit.
- It ensures compliance with regulatory agencies: Many regulatory agencies, including The Joint Commission and the Centers for Medicare and Medicaid Services (CMS) require healthcare organizations to have a safe environment of care, including properly tested medical equipment in order to participate in the Medicare and Medicaid programs.
What Does an Electrical Safety Test Check?
The specific parameters of testing may vary for different medical devices due to their classification in terms of risk, as well as the testing instructions provided by the manufacturer. At the same time, the general electrical tests for patient-applied devices typically include several aspects, which can be presented as follows:
| Testing/Inspection Element | What It Helps Evaluate | When It May Apply |
| Protective Earth (Ground) Continuity | Confirms that the ground wire within the power cord and the device enclosure has a low-resistance path to the wall outlet. This ensures any fault current safely routes to the ground rather than through a person. | Required for all Class I (grounded) medical electrical equipment. |
| Earth Leakage Current | Measures the amount of stray current flowing down the protective ground wire. | Routine testing to ensure internal insulation is not degrading. |
| Enclosure / Touch Current | Measures the electrical current that would flow if a person touched the chassis or outer casing of the medical device. | Essential for all devices touched by staff or patients during normal operation. |
| Patient Leakage Current | Measures the current flowing from the device’s “applied parts” (like ECG leads or ultrasound probes) directly to the patient. | Critical for any device that makes physical or electrical contact with a patient. |
| Physical and Visual Inspection | Checks for frayed cords, damaged strain reliefs, bent plug prongs, cracked enclosures, and fluid ingress. | Must be performed before any electrical measurements are taken. |
Note: Not all tests are necessary for all types of equipment. For instance, a device with a double-insulated plastic housing (class II) does not require a test for protective earth continuity, as it does not have a grounding wire.
When Should Medical Equipment Undergo Electrical Safety Testing?
There are no standard schedules for testing medical equipment. Particular cases have to be considered, including the particular equipment to be tested, the instructions provided by the manufacturer, the policies established by the facility, and the accreditation standards specified.
However, electrical safety testing is generally appropriate in the following scenarios:
- Initial Incoming Test: New or purchased medical equipment should be tested for proper function before first use to ensure it hasn’t been damaged during transportation.
- During Routine Preventive Maintenance: Testing is usually performed as part of a regularly scheduled preventive maintenance (PM) program. If a PM is due every year, an electrical safety test is usually scheduled for then as well.
- After Major Repairs: Whenever the equipment’s chassis is opened for inspection, replacement of any internal items of equipment, or any repairs to the power cable have occurred, the equipment is to be retested to verify that no modifications have been made that may introduce a hazard.
- Following Suspected Damage: When the equipment is dropped, exposed to liquids, or has been used during a patient incident, the equipment is to be removed from service for a safety inspection.
Healthcare facilities should rely on information provided in the original equipment manufacturer (OEM) manuals. If the OEM recommends testing every six months, the facility cannot test annually unless it has an approved alternative equipment maintenance (AEM) program established and supported by evidence, as allowed by CMS.
Electrical Safety Testing vs. Preventive Maintenance vs. Functional Testing
It is a prevalent misconception among facility managers that these terms represent the same concept, while they actually stand for separate medical equipment service segments.
Preventive maintenance refers to a broad class of medical equipment service, which includes performing a list of recommended actions provided by the manufacturer. Usually, it consists of replacing standard medical equipment parts subject to damage (filters, O-rings, batteries), cleaning the interior cooling fans, and lubricating the critical elements from failure.
Functional tests are designed to ensure that a machine functions properly for the intended clinical purpose. In the case of a defibrillator, this would mean that it delivers the correct number of joules. In the case of a vital signs monitor, it would mean that the blood pressure is accurate. Electrical safety tests are done to ensure the electrical safety of the machine.
A device can pass an electrical safety test and fail a functional test (for example, the device may not deliver an electric shock, but it may not accurately measure blood pressure). A device can pass a functional test and fail an electrical safety test (for example, the device may work fine, but the ground wire in the plug may be damaged, making the device unsafe). Therefore, all three tests are required for proper maintenance.
What Happens If Medical Equipment Fails an Electrical Safety Test?
If a medical device fails an electrical safety inspection, it is necessary to take immediate measures to eliminate the detected deviations. The standard procedure includes the following:
- Removal from Service: The equipment shall be taken off immediately from the service, disconnected from patients, and removed from the care area.
- Tagging: The equipment should be tagged as “out of service” or “do not use” to inform other personnel not to use the device.
- Investigation and Repair: A qualified biomedical equipment technician should conduct an investigation to determine the cause of the malfunction. In most cases, the cause may appear evident, for example, when the power cord is damaged, thus requiring its replacement. However, in some other situations, it might be necessary to open the equipment and check the internal components, for instance, the power supply.
- Retesting: The repaired equipment should not be sent back to the floor unless it has been tested to ensure that the problem has been appropriately addressed. A thorough electrical safety test together with a functional test should be performed.
If electrical safety testing identifies an equipment problem that requires corrective work, choosing the right medical equipment repair service can help ensure the issue is properly evaluated and documented. Bypassing the process of checking medical equipment for electrical safety and asking unqualified service providers to make repairs is a serious violation of safety, not to mention the applicable regulations.
Why Documentation Matters After Electrical Safety Testing
In the highly regulated healthcare environment, the adage “if it isn’t documented, it didn’t happen” is often taken quite literally.
Proper documentation of electrical safety testing is a given. When inspectors from your state’s health board, CMS, or the Joint Commission show up, they will no doubt ask to see maintenance records for certain equipment.
A complete electrical safety record should include:
- The date of the test.
- The specific equipment tested (include asset number and serial number if applicable).
- The specifics of the standard to which the equipment was tested.
- The actual readings, in numeric values (ideally with units of measurement, such as grounding resistance in ohms or leakage in microamps), not just a pass/fail indication.
- The qualified person responsible for the test.
- The calibration status of the safety analyzer used to perform the test.
Organized documentation helps facilities prove accreditation readiness, track the lifecycle of aging equipment, and demonstrate a proactive approach to patient safety.
How Healthcare Facilities Can Build a Practical Testing Program
Managing an inventory of medical devices, from simple things like hospital lights to complex diagnostic machines, can be overwhelming for a facility manager. In order to design a proper testing program, one must first:
- Maintain an Accurate Inventory: You cannot test what you do not know you have. Keep an updated computer inventory of all patient-connected equipment.
- Standardize Policies: Your facility should have a written policy stating the circumstances of testing (e.g., on receipt, after repair, or as part of a preventive maintenance schedule).
- Utilize Specialized Experts: Because medical devices are so heavily regulated by the FDA, it is critical that service technicians be trained in biomedical engineering to effectively maintain and repair this type of equipment. If your facility does not have a full-time, established clinical engineering department, it may be a good idea to contract services from an independent, specialized biomedical service organization. These companies have the right equipment and expertise to perform the required testing and maintenance.
Electrical Safety Testing for Healthcare Facilities in Illinois and the Midwest
At Midwest Biomedical Technologies (MBT), we know you cannot stop doing what you do to stop doing what you do. Located in Oak Brook, Illinois, we offer biomedical equipment testing, maintenance, and repair services to hospitals, clinics, surgery centers, and skilled nursing facilities in Chicagoland, the State of Illinois, and the Midwest as a whole.
Whether you have an imaging center in Indiana, a busy physician’s office in Wisconsin, or five surgery centers in the Chicago area, you and your colleagues can stop worrying about being compliant. Our biomedical technicians take care of that. By conducting regular, precise electrical safety tests as part of the routine preventive maintenance, they assure you that your equipment is operating according to manufacturers’ recommendations and that your facility is prepared for its next survey.
We offer an extensive range of equipment, from basic vital signs monitors and defibrillators to more sophisticated ultrasounds and C-arms, with years of experience with diagnostic and biomedical equipment.
Ensure Your Equipment Is Safe, Compliant, and Ready for Use
Electrical safety testing is a key process and responsibility for ensuring the well-being of patients and staff and the smooth operation of the facility. It is not only necessary but mandatory to meet manufacturer specifications, accreditation guidelines, and maintenance schedules.
If your facility requires assistance managing inventory, testing, or documentation, our staff is here to help.
Request Electrical Safety Testing or Documentation & Reporting from Midwest Biomedical Technologies now.
Frequently Asked Questions
What is electrical safety testing for medical equipment?
This is a specific type of a standardized test that uses special devices to check a medical device’s grounding and assess possible current leakage. It helps ensure the safety of the patient and medical personnel from electric shock.
How often should medical equipment undergo electrical safety testing?
Testing frequency is defined by the servicing instructions specified by the equipment manufacturer, facility policy, and the potential for risk. Testing is usually performed before first use of the equipment, as part of the recommended and scheduled maintenance, and following any significant repair and overhaul.
What does electrical safety testing check?
Depending on the device classification, testing usually includes measurement of protective earth (ground) continuity, enclosure leakage current, and patient-applied part leakage current. In addition, a visual inspection of the power cord, plug, and external case for damage is also performed.
Is electrical safety testing required after medical equipment repair?
Yes. Anytime a medical device is subjected to corrective service, such as opening the chassis for internal component replacement or internal cable installation, it should be tested for electrical safety.
Who should perform electrical safety testing?
Testing shall be performed only by qualified biomedical equipment technicians or clinical engineers who are trained in the interpretation of manufacturer service manuals and the use of appropriate electrical safety analyzers.
What documentation should a healthcare facility keep after electrical safety testing?
Facilities shall retain records of the test date, the asset tested, measured current and voltage values, standards applied, the technician’s name, and the tester’s status. The records should be provided to prove the conformity of testing procedures and equipment during accreditation surveys.