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US power cables & sockets explained simply

Which solution makes the most sense for the USA? For many enquiries, this can be summarised simply: 2-pin devices are usually Type A / NEMA 1-15P, earthed devices are generally Type B / NEMA 5-15P, and it is always necessary to check for 120 V / 60 Hz as well as the correct version for the North American market.

Type A / NEMA 1-15P Type B / NEMA 5-15P 120 V / 60 Hz USA/Japan hybrid possible

Overview of US sockets and power cables

For the USA, Type A and Type B are particularly relevant. In professional settings, these plug systems are often also referred to as NEMA 1-15P and NEMA 5-15P. However, the plug shape alone is not sufficient for making the correct choice. The protective earth conductor, device voltage, cable type and the appropriate version for the target market are also crucial.

Plug types A and B in direct comparison

US-Steckertypen Typ A und Typ B im Vergleich
The illustration shows a direct comparison of the plug types relevant in the USA: Type A and Type B, or NEMA 1-15P and NEMA 5-15P.
Plug type Number of pins Typical application Brief description
Type A / NEMA 1-15P 2-pin Equipment with protective insulation without a protective conductor Usually the right choice for 2-pole applications in the USA
Type B / NEMA 5-15P 3-pole Earthed appliances with protective conductor The standard solution for many earthed devices in the USA
Important: With US power cables, it is not just the plug type that matters. Particularly in B2B, OEM and project environments, you should always also consider 120 V / 60 Hz, the correct NEMA version and, depending on the product, the appropriate UL/CSA compliance.

Quick decision guide

1. Device is 2-pole

For insulated devices without an earth connection, Type A / NEMA 1-15P is usually the clear and appropriate choice.

2. The device is earthed

As soon as an earth connection is required, Type B / NEMA 5-15P is usually the correct version.

3. Device is rated for 230 V only

In this case, a suitable US power cable alone is not sufficient. It must be checked whether the device is suitable for 120 V / 60 Hz or has a wide-range input.

In practice: For many current B2B and export enquiries, three points are particularly important: Type A for 2-pin devices, Type B for earthed applications, and a thorough check of the device’s suitability for 120 V.

Why Type A / NEMA 1-15P is usually the best choice for 2-pole devices

Type A or NEMA 1-15P is the typical 2-pole solution for many applications in the USA. This works well with insulation-protected devices without a protective conductor and with 2-core device supply cables.

Type B / NEMA 5-15P, on the other hand, is 3-pole. With a 2-pole appliance, the protective earth conductor would remain unused in practice. This is precisely why a Type A version is often the clearer and more economical choice for 2-pole applications.

Rule of thumb: 2-pole appliance without earth = usually Type A / NEMA 1-15P. Earthed appliance = usually Type B / NEMA 5-15P.

Why Type B / NEMA 5-15P is important for earthed appliances

For devices with a protective conductor, the earth connection should not be bypassed using unsuitable adapters or makeshift solutions. For such applications, Type B / NEMA 5-15P is the appropriate choice, as it takes protective earthing into account.

This point is particularly important in IT technology, industrial applications, system houses, OEM projects and export ventures, to ensure that the solution is not only mechanically compatible but also technically sound.

Practical recommendation: For earthed devices with C13, C5, C15 or C19, Type B / NEMA 5-15P is in many cases the technically sound US solution.

Very similar design to Japanese plugs, but different target market requirements

One point in particular often leads to misunderstandings in practice: US Type A and Type B plugs have a very similar design to the corresponding Japanese plugs. This quickly leads to the assumption that a Japanese solution is automatically also a sound US solution.

This is precisely where the difference lies: the plug design alone is not sufficient. Although very similar plug faces are used in the USA and Japan, approvals, labelling and target market specifications should nevertheless be considered separately.

  • The design appears very similar and, in many cases, makes mechanical sense.
  • Nevertheless, the correct design and the appropriate approvals are what count for the target market.
  • Particularly for projects, series production and OEM products, mechanical fit alone is therefore not sufficient.
In short: a very similar design does not automatically mean the same suitability for the target market. Anyone wishing to supply exclusively for the USA or simultaneously for the USA and Japan should select the appropriate version specifically.

Hybrid power cable for the USA/Japan: a real advantage for OEMs and manufacturers

This is precisely where MAG has made a particularly interesting breakthrough: there is a hybrid power cable for the USA and Japan that capitalises on the similar design of both markets and combines key requirements for the USA and Japan in a single solution.

A concrete example is this product:
Hybrid power cable Japan/USA Type B to C13, 1.80 m, AWG18, VCTF/SJT, approvals PSE / JET / UL

This solution is particularly of interest to OEMs, manufacturers, integrators and project clients who wish to design products or device platforms not just for a single market, but for both the USA and Japan in parallel.

Fewer variants

A hybrid solution can help reduce the number of separate country-specific cable variants.

Simpler procurement

This simplifies purchasing processes, product management, approvals and coordination between engineering and logistics.

Stronger for OEM projects

This can reduce variants, simplify procurement and make international platforms more cost-effective.

Practical benefit: A suitable hybrid solution can reduce variants, simplify procurement and make projects for the US and Japan significantly easier to plan.

120 V / 60 Hz: the key difference compared to Europe

Many devices from Germany and Europe are designed for 230 V / 50 Hz. In the US, however, 110 to 120 V at 60 Hz is standard in normal domestic and office environments.

This leads to a simple but important practical point: a suitable US power cable does not automatically make a 230 V device suitable for use in the US.

  • With power adapters featuring a wide-range input, use is often possible without any problems.
  • For devices with a fixed 230 V input, the voltage must be considered separately.
  • For sensitive or frequency-dependent devices, the 60 Hz situation should also be checked.
Important: For the USA, plug type, voltage and frequency should always be considered together.

Why suitable US versions make sense in B2B business

For travel, test setups or short-term service assignments, an adapter can be practical in individual cases. For regular use, for B2B, series production requirements or a permanently reliable North American version, however, a suitably designed US power cable is usually the better choice.

This is particularly true when requirements such as NEMA plug systems, UL/CSA-approved versions, robust cable types such as SVT or SJT, or defined lengths and cross-sections play a role in the project.

In short: an adapter is often helpful for testing or as a temporary solution. For projects, series production and professional applications, a genuine US power cable is usually the far cleaner solution.

Typical applications: from C5 to C19

In the US range, different combinations make sense depending on the device side. Common examples include:

Type B to C5

Typical for laptops, power adaptors, AV equipment and compact devices with a three-pin plug.

Type B to C13

A very common solution for monitors, PCs, printers, network and office equipment.

Type B to C19

Suitable for servers, PDUs, storage and high-performance IT installations.

Practical benefit: With the right combination of NEMA plug, cable type and device side, US projects can be planned much more easily and procured more efficiently.

When MAG can help

MAG currently provides particularly strong support with initial technical assessments, selecting suitable US versions, and planning customised power cables for projects, OEM initiatives and recurring requirements.

If a project-specific solution is required for the USA or for both the USA and Japan, MAG can assess which version is technically sound, economically viable and suitable for the intended application.

For many current enquiries, this means in practice: Type A / NEMA 1-15P for 2-pin devices, Type B / NEMA 5-15P for earthed applications and, if required, a hybrid solution when supplies are to be made to both the US and Japan.

Our commitment: to provide practical advice, carry out thorough technical checks and, where necessary, develop a suitable solution for projects, series production or custom-made products.

Suitable solutions at mag-kabel.de

FAQ on US power cables and plugs

Which plug types are common in the USA?

In the USA, Type A and Type B are the most common.

What does NEMA 1-15P mean?

This is the standard 2-pin US version without a protective earth conductor and corresponds to Type A in everyday use.

What does NEMA 5-15P mean?

This is the standard earthed version for many US applications and corresponds to Type B in everyday use.

Is there also a hybrid solution for the USA and Japan?

Yes. MAG offers a hybrid power cable for Japan and the USA with PSE / JET / UL certification, which is particularly of interest to OEMs, manufacturers and international projects.

Is a different plug sufficient for the USA?

No. You must also take into account 120 V / 60 Hz and the correct version for the target market.

When is Type A usually the best choice?

Primarily for 2-pin, insulated devices without an earth connection.

When is Type B usually the best choice?

For earthed devices and many typical applications using C5, C13, C15 or C19.

Can MAG assess a suitable US solution for projects?

Yes, particularly for project requirements, series production prospects, OEM requirements, hybrid requirements or custom-made products.

Planning a project for the USA or the USA/Japan?

For test quantities, project requirements or series production enquiries, we can assist you in choosing between adapters, international power cables, hybrid versions and custom-made solutions.

Enquire about a project

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