The three legs of North America product Safety

Machinery manufacturers entering the North American market often ask the same question: Is it necessary to understand the National Electrical Code (NEC – NFPA 70) in order to assess the electrical conformity of machinery exported to the United States?

At first glance, the answer appears to be yes. The NEC is the fundamental electrical installation code used throughout the United States, and manufacturers quickly discover that each state adopts a specific edition of the code. However, the situation is a bit different.

When researching U.S. electrical requirements, manufacturers frequently encounter the NEC adoption map published by the National Fire Protection Association (NFPA). This map indicates which edition of the NEC has been adopted by each U.S. state.

This can create confusion for companies exporting machinery to the United States because:

• The NEC is a large and technically demanding document.
• Different states adopt different editions of the code.
• Some states, counties, or cities introduce additional local requirements.

A well-known example is the Chicago Electrical Code, which modifies and supplements the NEC before publication at the municipal level.

From the perspective of a machinery manufacturer, this situation may appear overwhelming: not only must the NEC be understood, but the correct local version must also be identified for each destination.

Fortunately, this interpretation does not reflect how the North American electrical safety system actually operates for machinery.

For industrial machinery in North America, the most relevant standards are the product standards, not installation codes.

In the United States, two standards are particularly important:

• NFPA 79 — Electrical Standard for Industrial Machinery
• UL 508A — Standard for Industrial Control Panels

In Canada, the two key standards are:

• CSA C22.2 No. 286 — Industrial Control Panels
• CSA C22.2 No. 301 — Industrial Machinery

These standards specifically address the design and construction of electrical equipment used in machinery. When machinery electrical systems are designed according to these standards, they are generally considered suitable for use within the North American electrical safety framework.

In other words, machinery manufacturers normally do not need to design their machines directly according to the NEC or the CE Code, provided that they comply with the applicable machinery standards.

A useful concept for understanding the North American electrical safety model is often referred to as the “three-legged stool”.

This concept was summarized effectively by Jim Pauley, President and CEO of NFPA:

“A robust installation code that applies to installation of electrical products, designed, constructed and certified to product safety standards, which are correlated with the installation code, and a measurable, transparent and reliable system of electrical inspections are three crucial components of an effective safety system.”

The electrical safety system in North America therefore relies on three interdependent elements.

1. Electrical Installation Codes. The first pillar is the existence of a comprehensive installation code governing electrical installations.

• In the United States, this is the National Electrical Code (NEC – NFPA 70).
• In Canada, the equivalent is the Canadian Electrical Code (CEC).

These codes primarily regulate how electrical equipment is installed, rather than how machinery itself is designed.

2. Product Safety Standards. The second pillar consists of product safety standards, which define how electrical equipment must be designed and constructed. For machinery electrical equipment, the most important examples include:

United States

• NFPA 79 — Electrical Standard for Industrial Machinery
• UL 508A — Industrial Control Panels

Canada

• CSA C22.2 No. 286 — Industrial Control Panels
• CSA C22.2 No. 301 — Industrial Machinery

These standards are developed in coordination with the installation codes, ensuring that compliant equipment can be safely installed within NEC or CE Code installations.

A critical aspect of this system is that compliance with product standards is verified by independent certification bodies, rather than simply declared by manufacturers.

In the United States, these certification bodies are known as Nationally Recognized Testing Laboratories (NRTLs).

3. Inspection by the Authority Having Jurisdiction. The third pillar is the presence of a formal inspection system. Electrical installations and machinery are inspected by the Authority Having Jurisdiction (AHJ) before they are energized and placed into service.

The AHJ may be:

• a municipal electrical inspector
• a state authority
• an insurance inspector
• another designated authority responsible for electrical safety compliance

The AHJ ensures that installations comply with the applicable codes and that equipment has been properly certified where required.

For machinery manufacturers exporting to North America, the practical implications are clear.

In most cases, electrical systems should be designed according to machinery-specific product standards, rather than directly according to installation codes.

The typical reference standards are:

United States

• NFPA 79
• UL 508A

Canada

• CSA C22.2 No. 286
• CSA C22.2 No. 301

Compliance with these standards ensures that machinery fits within the broader North American electrical safety framework.

However, there are situations where the installation codes may become directly relevant to machinery design. For example:

• very large automated production lines
• process plants
• chemical facilities

In these cases, consulting a specialist familiar with the NEC or the Canadian Electrical Code is strongly recommended.

Manufacturers should also be aware that CE marking has no regulatory value in the United States or Canada. Although CE-marked machinery may already comply with European standards, this does not automatically demonstrate compliance with North American safety requirements.

Machinery exported to North America should therefore be designed or adapted according to the relevant North American product standards.

A final distinction concerns product certification:

• United States. Certification by an NRTL is generally not legally mandatory, but in practice it is strongly expected by inspectors, customers, and insurance authorities.
• Canada. Certification by an accredited certification body is mandatory before machinery can be approved for operation.

While the NEC in the USA and the CE Code in Canada are a fundamental component of the North America electrical safety system, machinery manufacturers exporting to North America typically do not need to design their equipment directly according to the NEC.

Instead, they should focus on machinery-specific product standards such as NFPA 79 and UL 508A in the United States, and CSA C22.2 No. 286 and No. 301 in Canada.

Understanding how these standards fit within the broader “three-pillar safety system” provides manufacturers with a clearer and more practical path to achieving electrical compliance in North America.