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To check phase wire and neutral wire which device is used?
Neon Tester
Combination plier
Plumb bob
Pen Knife
Neon Tester
A neon tester is a handheld diagnostic tool specifically designed to detect the presence of electric potential in AC circuits. It serves as a safety device to distinguish between a live (phase) wire and a neutral wire during electrical installation and maintenance.
A neon tester is a handheld diagnostic tool specifically designed to detect the presence of electric potential in AC circuits. It serves as a safety device to distinguish between a live (phase) wire and a neutral wire during electrical installation and maintenance.
I=RsтАЛ+RbтАЛVтАЛ тАФ Current limiting calculation where RsтАЛ is the series resistance and RbтАЛ is the human body resistance.
The tester consists of a high-value series resistor, a neon lamp, and a contact tip. When the tip touches a phase wire and the user touches the metal end cap (earthing the circuit through their body), a small current flows through the neon bulb, causing it to glow. The high resistor limits this current to a safe level (typically below 1 mA) to prevent electric shock.
Neon testers are effective for voltage ranges typically between 100V and 500V.
The glowing discharge occurs due to the ionization of neon gas within the glass bulb.
The device relies on the user providing a path to ground through their body resistance, which is why the finger must contact the metal end.
They are not suitable for measuring voltage magnitude, only for presence detection.
Simple and compact design
Extremely low power consumption
Provides immediate visual indication
Sensitive to external light conditions
Cannot determine precise voltage level
Requires physical contact with the user
Residential electrical wiring checks
Testing switch sockets for proper phase orientation
Identifying live terminals in distribution boards
Always ensure the neon tester is rated for the circuit voltage being tested.
Option B (Combination plier) is a gripping/cutting tool, Option C (Plumb bob) is for vertical alignment, and Option D (Pen Knife) is for cable stripping.
A is correct тАФ The Neon Tester utilizes a neon discharge lamp to visually indicate the presence of high potential in phase wires.
In competitive exams, always remember that a Neon Tester requires a path to ground, so if you are wearing insulating shoes or standing on a rubber mat, the lamp might not glow even if the wire is live!