
424/90 1000V VOLTAGE DETECTOR
SAFETY INSTRUCTIONS
SAFE OPERATION AND STANDARDS
Anyone using this instrument should be knowledgeable and trained about the risks involved
with measuring voltage, especially in an industrial setting, and the importance of taking safety
precautions and of testing the instrument before and after using it to ensure that it is in good
working condition.
!WARNING
Please carefully read and fully understand the warning and operating
instruction before use. If the equipment is used in a manner not
specied by the manufacturer, the protection provided by the
equipment may be impaired.
Do not rely on the device to detect the presence or absence conductor
for safety purposes. This device is not suitable to determine if a circuit
is hazardous.
• Test the device on a known live source within the rated AC voltage range before and after use to
ensure it’s in good working.
• Do not use the device if it appears damaged or is not working properly.
• Do not attempt to detect voltage higher than 1000V.
• Use caution when working with voltage above AC 30V R.M.S, 42Vpeak or DC 60V. Such voltage
poses a shock hazard.
• Clean the device with a damp cloth. Do not use abrasives or solvents.
• There may still be voltage present even when there’s no visual or audio alarm on. The device
indicates active voltage in the presence of AC electric elds of sucient strength emanating from
the conductor. If the eld strength is low, the device may not provide indication of live voltages.
Lack of an indication occurs if the device is unable to sense the presence of the electric eld which
may be inuenced by several factors such, but not limited to shielded wires, type of insulation,
distance from the voltage source, socket design condition of the device and batteries. If there are
uncertainties, use other methods to verify the voltage.
• Do not assume neutral or ground wires are safe to touch. Incorrect or poorly connected circuits
may cause wires to be electrically charged, causing injury or death.
• Replace the batteries when low battery indication appears to avoid false readings that can lead to
electrical shock.
• Remove the alkaline batteries if the device is not used for an extended period of time, or if stored in
temperatures above 50 °C. If the batteries are not removed, battery leakage may result.
• Hold the device behind the NCV sensor, see page 6 for more detail.
• Comply with local and national safety regulations and requirements. Use personal protective
equipment such as approved rubber gloves, face protection, and ame-resistant clothing to
prevent shock and arc blast injury where hazardous live conductors are exposed.
• The detector will not detect and voltage if:
a. The wire is shielded.
b. The operate is not connected with the ground or isolated from an eective ground.
c. The voltage is DC (Direct Current)