Updated Industrial Wiring Codes You're Probably Not Following

Industrial facilities require proper wiring to keep operations running smoothly and safely. However, industrial wiring codes are complex and frequently updated. I often find that facilities fall behind on implementing the latest code requirements. In this article, I'll overview the key industrial wiring code updates you need to know.

Main Changes in the Latest NEC Code

The National Electrical Code (NEC) provides the basis for local and national electrical standards. Staying up-to-date with the NEC ensures your facility's wiring meets safety and performance requirements.

The 2017 NEC edition introduced several notable changes:

• Shorter disconnect distances - The maximum distance between a piece of equipment and its disconnecting means was reduced. This improves safety by allowing faster shutdowns.
• GFCI requirements expanded - More equipment now requires GFCI (ground-fault circuit interrupter) protection, like lighting near sinks. This prevents electrocution hazards.
• Reduced receptacle spacing - Receptacles must be placed closer together in more locations. This makes power more accessible.
• Dedicated equipment grounding conductors - More equipment now needs separate grounding conductors. This improves grounding reliability.

Failing to implement these changes risks non-compliant, unsafe wiring.

Key Updates for Hazardous Locations

Certain industrial environments with flammable materials or dust require special "hazardous location" wiring techniques. Updates to Article 500 and Article 505 of the NEC impact wiring in places like paint booths, grain elevators, and laundries.

Notable hazardous location wiring changes include:

• Zone classification - The code now uses zone classifications (0, 1, 2) to define explosion risk levels, replacing old divisions (1, 2). This brings the US in line with international standards.
• Expanded requirements - More locations now require hazardous wiring, like commercial garages and fuel pump areas. Be sure to re-evaluate locations in your facility.
• Grounding and bonding - Specific grounding and bonding methods are now required in Zone 20, 21, and 22 areas. Proper grounding is critical for safety.

Review hazardous areas with your electrician and update wiring as needed. Non-compliant wiring in hazardous locations poses a major safety risk.

Changes to Wiring Methods and Equipment

Aside from broad code changes, amendments also impact specific wiring techniques and electrical equipment. Stay up-to-date on changes relevant to your facility.

Key examples include:

• Updated cable tray sizing and spacing requirements.
• New overload protection options for motor installations.
• Reduced clearance requirements around some electrical equipment.
• Stricter standards for wiring insulation ratings.

Refer to the latest NEC edition for full details. Improper wiring methods can fail inspections or present fire and shock risks.

Action Items for Updating Your Facility

To ensure your facility's wiring complies with the latest codes, focus on the following action items:

• Review the new NEC edition - Have your electrician highlight the most relevant changes for your facility. Focus on safety improvements.

• Inspect existing wiring - Check that wiring meets new requirements, like disconnect distances, grounding, and spacing. Rewire where necessary.

• Update wiring in hazardous areas - Pay particular attention to any newly classified areas. Use compliant wiring methods.

• Apply new methods to future wiring projects - As you expand or upgrade wiring, follow the latest code requirements.

• Consider an external audit - An expert audit can identify any non-compliant wiring missed during self-checks.

Staying code-compliant takes effort but helps avoid citations, accidents, and power issues. Protect workers and operations by keeping up with key industrial wiring code updates. Plan annual reviews of the latest NEC changes.