Third Rail Voltage Tester (4E2-1)
Reliable High Voltage Third Rail Testing
The Knopp 4E2-1 Voltage Tester is designed to detect electrical potential between the third rail and ground on high voltage electrified transit systems. It uses two independent circuits with redundant neon bulbs to indicate the presence of voltage, providing double safety protection for the operator.
The prod handle and tester housing are made from moisture and oil resistant laminated phenolic for durability. Stainless steel prod tips ensure reliable contact, and a rubber hand guard is built into the housing to guide proper hand placement. No metal parts are exposed except for the two prod tips. All internal connections are soldered for long-term reliability.
Description
The neon indicating lamps are mounted in specially shielded cavities within the instrument, ensuring the glow indication is clearly visible even in bright, direct sunlight. The 4E2-1 was originally developed for the BART (Bay Area Rapid Transit) System in San Francisco/Oakland, California, and has since gained wide acceptance as a reliable tool for detecting the presence of third rail voltage.
Key Features:
- Can be used on AC or DC systems
- Operates up to 1,500 volts
- Spans a distance of up to four feet
- Dual neon lamp design for double safety protection
- Rugged phenolic handle and housing resist moisture and oil
- Stainless steel prod tips for durability and secure contact
- Rubber hand guard ensures safe and correct grip
- Soldered internal connections for dependable performance
- Shielded neon lamps for visibility in bright sunlight
- Developed for and used by BART and other transit systems
Additional services include a Certificate of Compliance to Manufacturer’s Functionality.
Specifications
| Unit | Details |
|---|---|
| Overall Length | 48” (122 cm) |
| Tester Housing | 20” (50.8 cm) length, 1.25” (3.20 cm) diameter |
| Prod Handle | 8” (20.3 cm) length, 0.625” (1.60 cm) diameter |
| Weight | 12 ounces (0.34 kg) |
| Maximum Voltage | 1500 volts |
| Frequency | DC through 60 Hz |
| Maximum Current Draw | <4 milliamperes at 1500 volts |
