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Identifying ECG cables: design, number of conductors, standard
In short: An ECG cable system consists of either... Main cable plus patient line or from a Complete cable, which combines both. Three pieces of information determine which part you need: the plug type on the device, the number of wires, and the color coding standard.
The three designs#
| Design | What it is | When to replace it |
|---|---|---|
| trunk cable | Connect the device to the patient line. It has the device-specific connector. | Rare. It is protected and hardly wears out. |
| Patient management | Leads from the main cable to the electrodes, with a clamp or snap fastener at the end. | Frequently. It is moved, cleaned, and breaks at the joints. |
| Complete cable | Main cables and lines in one piece. | Always as a whole. Individual wires cannot be replaced. |
Separate systems are more economical to operate: If a wire breaks, you only need to replace the patient line. Complete cables are simpler to purchase because only one part needs to be compatible.
Vein structure and derivation#
The number of wires depends on how many leads the device evaluates.
- 3-core: Basic monitoring on the monitor, extremity leads R, L and F.
- 5-core: Monitoring with a chest wall lead, plus N and C.
- 6-core: in individual monitor systems, such as Nihon Kohden BSM devices.
- 10-core: Resting ECG with twelve leads, four extremities and six chest wall positions.
Color coding: IEC or AHA#
Two standards are in circulation. They differ in the color and marking of the electrode ends. A cable conforming to the incorrect standard will fit mechanically, but will lead to confusion when connecting it.
| position | Marking according to IEC | Color |
|---|---|---|
| right arm | R | red |
| left arm | L | yellow |
| left leg | F | green |
| right leg | N | black |
| chest wall | C1 to C6 | red, yellow, green, brown, black, purple |
The AHA standard uses different letters and colors. Order according to the standard used in your facility and do not mix and match within a department. The standard is indicated on the product label.
Assignment by manufacturer#
| Manufacturer | Device series (selection) | Notice |
|---|---|---|
| GE, Marquette, Hellige | MAC 400 to MAC 5500, MAC 5000ST, Microsmart M, CASE series, Dash 1000 to 5000 | The multilead trunk cable broadly covers the MAC series. |
| Philips, HP | Main cables M1500A, M1668A, M1669A; lines M1613A, M1671A, M1672A, M1978A | Assignment via the M-number, not via the device name |
| Nihon Kohden | Cardiofax Q, ECG-1250A to ECG-9620, BSM-2300 to BSM-9800 | Custom versions for BSM monitors and Life Scope |
| Mindray, Datascope | MEC 1000 to MEC 1200, PM5000 to PM9000, BeneHeart, Passport | Distinguish between 6-pin and 12-pin connectors, choose between clip or push button. |
| Dräger, Siemens | MultiMed, POD and POD 6, Infinity M300 and M540 | POD 6 accepts the 6-wire cable |
| Schiller, Petas | Cardiovit AT-3 to AT-110 | Complete cable with clips |
Frequently Asked Questions#
- What is the difference between a trunk cable and a patient line?
- The main cable connects the device to the patient line and carries the device-specific connector. The patient line runs from there to the electrodes. In a complete cable, both parts are permanently connected. Wear and tear almost always occurs on the patient line because it is moved and cleaned.
- How do I know whether I need IEC or AHA?
- Refer to the labeling of the existing electrode ends. According to IEC standards, the limb leads are designated R, L, F, and N in red, yellow, green, and black, respectively. The AHA standard uses different letters and colors. Adhere to the standard adopted by your department.
- Can I use a 5-core cable with a 3-core device?
- Only if the connector and pinout match. The number of wires depends on what the device is evaluating: 3-wire for basic monitoring, 5-wire with a chest lead, 10-wire for a resting ECG with twelve leads. If in doubt, please tell us the device type.
- Is a complete cable or a separate system worthwhile?
- Separate cables are more economical in operation because, in the event of a break, only the patient line needs to be replaced. A complete cable must always be replaced as a whole. However, for devices that are frequently transported, a complete cable often has a longer mechanical lifespan.
- Do you carry cables for older ECG devices?
- Yes. Our product range includes everything from current systems to series like GE Hellige, Cardiofax Q, and early ECG models from Nihon Kohden. Please specify the device type and year of manufacture, and we will check the compatibility.
- What does the term "clip" or "snap fastener" mean?
- It describes the electrode end. Clips grip disposable electrodes with a tab, snap fasteners lock onto electrodes with a button connector. The end must fit the electrodes you are using, not the device.
Assignment by nib#
Send us the name of your existing cable or a photo of the connector. We'll compare it to our product range and tell you the correct version and price. This also applies to devices that are no longer listed in the manufacturer's catalog.
Telephone 02363 3663-0 · kontakt@nispel.de · Request for quotation
Last updated: August 25, 2026. The information is based on manufacturer specifications for the items in our product range. In case of doubt, the instruction manual for your device is binding.