Checklists Before Inspection - LG RCWFH Series Instruction Manual

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4-11. Checklists before inspection

1) Thorough preparation
Check emergency treatment method, cleanness of surroundings, and safety of facilities and machines.
2) Review based on the circuit diagram
When the power system is supplied through other systems, check various power sources, if the 1st breaker is
supplying the power or not and installation status of the ground wire.
3) Contact
Check if you can closely and clearly communicate with relevant organizations.
4) Check zero voltage status and safety measures
Review lists shown below for safety when reviewing the main circuit.
a) Make the main circuit zero voltage by opening related breaker and disconnecting switch.
b) Check zero voltage stage with an electroscope and ground at needed spots.
c) Take out circuit breakers to make short a circuit and attach display "inspecting."
d) Adjust disconnecting switches after cutting the power.
e) Especially when the power is supplied with incoming/distributing panel from a consumer, automatic control, or
MCC board, take measures in (c) and (d) above for those switches.
5) Warnings about current and voltage
Implement grounding after discharging the remaining current when inspecting parts of the condenser and cable.
6) Prevention of malfunction
Attach power cut and caution marks.
7) Prepare for protective tools for insulation
Wear protective tools for safety that match the rated voltage such as insulated gloves, safety helmets, insulated
tall boots, safety apparel, etc.
8) Measures for invasion of mice and insects
Prepare measures to prevent mice, insects, snakes, etc. from entering the site.