---
title: MDR Electrical Safety Checklist: IEC 60601-1 for MedTech Startups
description: A startup-sized electrical safety checklist against EN 60601-1 and EN 60601-1-2, prioritized by risk of failure and mapped to MDR Annex I.
authors: Tibor Zechmeister, Felix Lenhard
category: Electrical Safety & Systems Engineering
primary_keyword: electrical safety checklist IEC 60601-1 startup
canonical_url: https://zechmeister-solutions.com/en/blog/electrical-safety-checklist-startups
source: zechmeister-solutions.com
license: All rights reserved. Content may be cited with attribution and a link to the canonical URL.
---

# MDR Electrical Safety Checklist: IEC 60601-1 for MedTech Startups

*By Tibor Zechmeister (EU MDR Expert, Notified Body Lead Auditor) and Felix Lenhard.*

> **A useful electrical safety checklist for a startup is not 200 items long. It is 20 items that catch the failures auditors and test labs see repeatedly: unclear essential performance, undefined applied parts, missing creepage margins, uncertified mains supplies, and sloppy risk files. Fix those before booking chamber time.**

**By Tibor Zechmeister and Felix Lenhard.**

## TL;DR
- EN 60601-1:2006+A1+A12+A2+A13:2024 and EN 60601-1-2:2015+A1:2021 are the harmonised electrical safety and EMC standards referenced by MDR Annex I §14 and §17.
- Most first-time test failures come from five or six root causes, not from obscure clauses — targeting those is where startup effort pays off.
- The checklist below is organised by what blows up most often: essential performance, applied part classification, isolation and creepage, power supply pedigree, EMC immunity modes, labelling, and the risk file behind all of it.
- A startup with a three-person engineering team can realistically prepare for 60601-1 testing in four to six weeks of focused work, if the design is frozen.
- The checklist is not a substitute for the standard text or for a competent test engineer. It is a tool to make your lab visit shorter and cheaper.

## Why this matters

Exhaustive electrical safety checklists exist. They are 200 lines long, they cover every clause of EN 60601-1, and they are useless to a three-person startup the week before a lab booking. Nobody reads them. Nobody finishes them. They sit in a shared drive while the founder stares at a 400-euro-an-hour test engineer explaining why the device just failed dielectric strength.

What a startup actually needs is a short list of the things that fail most often, ordered by the probability and cost of failure. Tibor has watched about 50 first-time electromedical devices go into 60601-1 testing. The failure modes repeat. The same mistakes, the same missed assumptions, the same conversations in the test lab parking lot at 5 pm.

This post gives you that short list.

## What MDR actually says

MDR Annex I §14 ("Construction and interaction with their environment") sets general requirements for protection against electrical, mechanical, and thermal hazards. §14.5 specifically addresses electromagnetic disturbances. §17 covers electronic programmable medical systems, including software lifecycle obligations. MDR does not prescribe test methods — it points to harmonised standards for presumption of conformity.

For electromedical equipment that means:

- **EN 60601-1:2006+A1+A12+A2+A13:2024** — general requirements for basic safety and essential performance.
- **EN 60601-1-2:2015+A1:2021** — electromagnetic disturbances (EMC).

Conformity with these gives presumption of conformity against the relevant parts of Annex I. Additional particular standards in the EN 60601-2-xx series and collateral standards in the EN 60601-1-xx series apply depending on device type and use environment.

The checklist below maps each item back to an Annex I clause or a specific part of the standard so you know why you are checking it, not just that you are.

## A worked example

Two founders in Vienna bring a nerve-stimulation benchtop device for final 60601-1 testing. They have built their own power supply, defined three operating modes, and written "the device shall stimulate nerves safely" as their essential performance. The test lab returns four findings on day one: essential performance too vague to monitor during immunity testing, applied part classification (BF vs CF) undecided, custom power supply without its own safety file, and creepage distances on the main PCB below single-fault condition requirements.

Cost of those four findings: one delayed test campaign, two weeks of design rework, one retest cycle, roughly EUR 22,000 of extra lab and engineering time. Every one of them would have been caught by the checklist below, in-house, in a day.

## The Subtract to Ship playbook — the 20-item checklist

Work through these in order. Do not skip items because you "already know." Write down a one-line answer to each. If you cannot, you have found your next week of work.

### Essential performance and classification (the most expensive failures)

**1. Essential performance statement — written, narrow, testable.**
Is your essential performance defined clearly enough that a test engineer can monitor it during every EMC immunity test? "Safely stimulates nerves" is not testable. "Delivers pulses within ±10 percent of setpoint amplitude and ±5 percent of setpoint frequency" is. EN 60601-1 clause 4.3.

**2. Applied parts — every one identified, classified, and justified.**
Every part that touches the patient during normal use. Classified as B, BF, or CF. Justified against cardiac application. EN 60601-1 clause 4.6 and clause 8.3.

**3. Single fault condition scenarios documented.**
What are the single fault conditions for your device? Component opens, component shorts, insulation fails, grounding lost. Do you know how the device behaves in each? EN 60601-1 clause 4.7 and 13.

**4. Means of protection (MOP, MOOP, MOPP) mapped.**
Where does each means of operator protection and means of patient protection sit in your isolation architecture? You should be able to draw it on a napkin. EN 60601-1 clause 8.5.

### Power supply and isolation

**5. Mains power supply certified against 60601-1.**
Is your mains adapter a medical-grade supply with its own test report? A commodity adapter saves EUR 40 and costs you weeks in retesting. Clause 8.

**6. Creepage and clearance distances verified on the PCB.**
With your working voltage and pollution degree, are creepage and clearance distances adequate for the number of MOPs they support? This is the single most common hardware failure we see. Clause 8.9.

**7. Dielectric withstand voltages calculated and bench-tested.**
Run a pre-compliance hipot test at your bench with a borrowed or rented tester before you get to the lab. Clause 8.8.

**8. Earth bonding resistance below the limit on every accessible conductive part.**
Yes, every one. Including the screws you forgot about. Clause 8.6.

**9. Leakage currents (earth, enclosure, patient) estimated in normal and single fault conditions.**
Estimated, not just measured. You need to know why the number is what it is. Clause 8.7.

### Mechanical and thermal

**10. Enclosure IP rating matches intended use environment.**
Home use, operating theatre, ambulance — each has different ingress expectations. The number on the datasheet must match the environment in the intended purpose. Clause 11.

**11. Touch temperatures below limits under normal use and worst-case ambient.**
If the enclosure reaches 48°C during continuous operation at 35°C ambient, you fail. Run the thermal test on your bench with a thermocouple before the lab does. Clause 11.

**12. Battery safety covered if applicable.**
Lithium chemistry brings its own clause tree and often a separate EN standard. Do not discover this at the lab.

### EMC preparation (EN 60601-1-2)

**13. Number of essential performance operating modes declared and minimized.**
Every declared mode must be monitored during every immunity test. Three modes means three times the chamber time for immunity. Ruthlessly narrow the list. EN 60601-1-2 clause 5.2.

**14. Pre-compliance emissions scan performed on the bench.**
Even a cheap near-field probe set and a rented spectrum analyser will catch the worst offenders. A half-day of pre-scan saves a day of retesting.

**15. ESD hardening — cables, seams, buttons — checked.**
Electrostatic discharge immunity is where most handheld devices fail first. Known cable entry points, exposed metal, and touchscreen bezels are the usual suspects. EN 61000-4-2 referenced through EN 60601-1-2.

**16. Cable lengths and configurations match the test plan.**
Longer cables act as antennas. The test article cable set must be the same as the commercial cable set, or the test report covers only what you actually tested.

### Labelling and documentation

**17. Device markings complete and durable per EN 60601-1 clause 7.**
Type B/BF/CF symbol, mains symbol, serial number, manufacturer, UDI, electrical ratings. Permanent, legible, still present after the wipe-down test. Clause 7.

**18. Instructions for use contain the EMC immunity tables and the intended use environment.**
EN 60601-1-2 requires specific IFU tables. Labs will reject a test plan that does not reference them. Clause 5.2.1.

**19. Risk management file per EN ISO 14971:2019+A11:2021 consistent with the 60601-1 file.**
The hazards, risk controls, and residual risks in your risk file must match what the test report evaluates. Inconsistency between these two documents is the single most common notified body finding in this area.

**20. Design history (or technical documentation) shows the test article is the final design.**
Drawings, BOM, firmware version, schematic revision — all identify the same article that is sitting on the test bench. This is the item that, when missing, voids the entire report.

## Reality Check

Use these to decide whether you are ready to book a test lab slot.

1. Can you state your essential performance in one sentence and defend it to a test engineer?
2. Is every applied part classified (B, BF, or CF) with documented reasoning?
3. Is the mains power supply a medical-grade unit with its own EN 60601-1 evidence?
4. Have you verified creepage and clearance distances on the PCB layout, not just assumed the CAD tool did it?
5. Have you run a pre-compliance emissions scan on the bench in the last two weeks?
6. Is the operating mode list for EMC immunity as short as you can justify?
7. Is the device design — hardware, firmware, labels — genuinely frozen for the duration of the test campaign?
8. Does your risk management file reference the same hazards the test plan will evaluate?

If three or more answers are no, do not book the lab this month. Fix the gaps first.

## Frequently Asked Questions

**Is this checklist a substitute for the standard?**
No. It is a filter to find the most common problems before you pay for a test engineer to find them. The standard text is still the source of truth, and your test lab is still the arbiter.

**We are a pure software company — do we need any of this?**
If your software runs on hardware you manufacture or place on the market as a medical device, yes. If your product is software-only running on off-the-shelf consumer hardware, the electrical safety burden falls on the hardware manufacturer, not you. Your obligation is intended use compatibility.

**Can we delegate all of this to the test lab?**
You can pay a lab to prepare your file. It costs roughly as much as testing itself and it does not absolve you of responsibility under MDR. The lab does not own your device; you do.

**How much of this applies to a Class I electromedical device?**
All of it. Classification determines the conformity assessment route under MDR, not the underlying product safety requirements. Annex I applies to every device.

**What if we only sell inside one country?**
MDR applies to placing on the market anywhere in the EU. There is no national carve-out for electrical safety requirements.

**Do we need to redo this checklist for every hardware revision?**
For material changes to electrical architecture, isolation, enclosure, or power path — yes. For a minor firmware tweak that does not affect essential performance or safety functions — usually no, but document the decision.

## Related reading

- [MDR electrical safety requirements](/blog/mdr-electrical-safety-requirements) — the regulatory foundation.
- [MDR electrical safety costs: IEC 60601-1](/blog/electrical-safety-costs-iec-60601-1) — what this all costs to get wrong.
- [Common IEC 60601-1 test failures](/blog/common-iec-60601-1-test-failures) — the failure data behind this checklist.
- [Basic safety and essential performance in IEC 60601-1](/blog/basic-safety-essential-performance-iec-60601-1) — deep dive on the most important concept in the standard.
- [IEC 60601-1 test lab process](/blog/iec-60601-1-test-lab-process) — what the lab does with your device once you hand it over.

## Sources

1. Regulation (EU) 2017/745 on medical devices, consolidated text. Annex I §14, §17.
2. EN 60601-1:2006+A1+A12+A2+A13:2024 — Medical electrical equipment — Part 1: General requirements for basic safety and essential performance.
3. EN 60601-1-2:2015+A1:2021 — Medical electrical equipment — Part 1-2: Electromagnetic disturbances.
4. EN ISO 14971:2019+A11:2021 — Application of risk management to medical devices.

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*This post is part of the [Electrical Safety & Systems Engineering](https://zechmeister-solutions.com/en/blog/category/electrical-safety) cluster in the [Subtract to Ship: MDR Blog](https://zechmeister-solutions.com/en/blog). For EU MDR certification consulting, see [zechmeister-solutions.com](https://zechmeister-solutions.com).*