Electrical Connections, Arcing Parts, Markings, and Disconnecting Devices

Conductors must be spliced or joined with splicing devices designed for their use or by brazing, welding, or soldering with a fusible metal or alloy. Soldered splices must first be spliced or joined in a way that makes them mechanically and electrically secure without soldering. The conductors can be joined by soldering. All splices, joints, and free ends of conductors must be covered with an insulation that is equal to that of the conductors or with an insulating device designed for this purpose.

Parts of electric equipment that can produce arcs, sparks, flames, or molten metal must be enclosed or separated and isolated from all combustible material.

Equipment cannot be used unless it features specific markings, such as the following:

• Manufacturer's name
• Trademark
• Other descriptive marking by which the organization responsible for the product may be identified
• Voltage
• Current
• Wattage
• Rating

Disconnection means for motors and appliances must be legibly marked to indicate their purpose. Each service, feeder, and branch circuit, at its disconnecting means or overcurrent device, must be legibly marked to indicate its purpose unless located and arranged in a way that the purpose is evident.

All markings must be able to withstand the environment in which the equipment will be used.

To learn more about Construction Electrical Safety visit our Construction Electrical Safety Online Training web page.