Which statement best describes final practice for phase identification after installation?

Which statement best describes final practice for phase identification after installation?

• A. Temporary note left for maintenance
• B. Stored in a file only
• C. Displayed on a label that fades over time
• D. Permanently posted near terminals

Answer: (D)

The main idea is that phase identification must be a lasting, visible part of the installation. After you’ve completed wiring, the information about which terminal is which needs to stay with the equipment for the life of the installation. A permanently posted label near the terminals ensures that anyone who looks at the gear—techs performing maintenance, operators, or inspectors—can quickly verify the correct phase at a glance. This reduces the risk of miswiring or energizing the wrong circuit and supports safe operation, lockout/tagout, and troubleshooting. Temporary notes or files don’t guarantee visibility or accuracy over time; they can be misplaced, forgotten, or become outdated. A label that fades or deteriorates isn’t reliable for long-term use, which again risks misidentification. Keeping the phase information permanently posted near the terminals provides a durable, accessible reference that stays with the equipment unchanged.

The main idea is that phase identification must be a lasting, visible part of the installation. After you’ve completed wiring, the information about which terminal is which needs to stay with the equipment for the life of the installation. A permanently posted label near the terminals ensures that anyone who looks at the gear—techs performing maintenance, operators, or inspectors—can quickly verify the correct phase at a glance. This reduces the risk of miswiring or energizing the wrong circuit and supports safe operation, lockout/tagout, and troubleshooting.

Temporary notes or files don’t guarantee visibility or accuracy over time; they can be misplaced, forgotten, or become outdated. A label that fades or deteriorates isn’t reliable for long-term use, which again risks misidentification. Keeping the phase information permanently posted near the terminals provides a durable, accessible reference that stays with the equipment unchanged.