In the sequence of operations for electrical installation, when should visual inspection be performed?

• A. Before testing, with the installation disconnected
• B. Precede testing and be carried out with the installation disconnected
• C. During operation with current flowing
• D. After energization

Answer: (B)

Visual inspection is done with the installation de-energized and before any testing to verify that the work has been completed correctly and safely. Checking physically at this stage lets you look for loose connections, damaged insulation, stray tools or materials, proper routing of conductors, correct labeling, and secure mounting without the hazards of live voltage. It also helps catch issues that could cause faults or pose safety risks once power is applied. Trying to inspect while current is flowing is dangerous and often can’t reveal certain problems that are obvious only when the system is off. So, the best practice is to perform the visual check before energizing and before testing, with the installation disconnected.