Article 110 – General Requirements for Electrical Installations

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Article 110 of the National Electrical Code® (NEC®) outlines the fundamental safety requirements for all electrical installations.

It ensures that equipment is installed, maintained, and operated safely, reducing risks of shock, fire, or mechanical failure.

110.2 – Approval All electrical equipment must be approved by the Authority Having Jurisdiction (AHJ) or tested by a recognized laboratory.
110.3 – Examination, Identification, and Installation
- Equipment must be listed and labeled for its intended use.
- Follow manufacturer’s installation instructions for safety and code compliance.
110.12 – Mechanical Execution of Work Installations must be neat, secure, and protected from physical damage. No sharp bends, loose connections, or unused openings left unsealed.
110.14 – Electrical Connections
- Terminations must ensure mechanical strength and proper conductivity.
- Use connectors compatible with the conductor material (copper or aluminum).
- Torque settings must meet manufacturer specifications.
110.26 – Working Space Around Equipment
- Maintain safe access and clearance around panels, disconnects, and service equipment.
- Typical clearance: 3 feet (0.9 m) in front of live parts, and at least 30 inches (762 mm) wide.
110.27 – Guarding of Live Parts
- Exposed energized components must be enclosed or guarded to prevent accidental contact.
- Barriers, partitions, or elevated placement may be used.
110.31 – Electrical Installations in Buildings and Structures
- Protect equipment from moisture, corrosive materials, or mechanical impact depending on the environment.

Always use listed and labeled equipment.
Follow the manufacturer’s instructions — they are legally enforceable under the NEC.
Maintain safe working clearances and proper mechanical workmanship.
Inspectors and electricians must verify compliance with Article 110 on every installation.