Mersen Surge-Trap Instructions

Surge-Trap Type 1 SPD for NEMA Type 4X Applications
®

DANGER

Hazard of Electric Shock, Burn or Explosion
• This equipment must be installed and serviced only by
qualified electrical personnel in accordance with national
and local electrical codes.
• Turn off all power supplying this equipment before
working on equipment.
• Always use a properly rated voltage-sensing device to
confirm power is off.
• Replace all devices, doors and covers before restoring
power to this equipment.
• Do not apply petroleum-based products to
non-metallic parts.
Improper installation or misapplication of these devices
may result in serious injury to the installer and/or damage
to electrical system or related equipment. Protective eye
wear and clothing should be worn whenever working
around hazardous voltages.
Failure to follow these instructions could result in serious
injury or death.

INSTALLATION

PANEL MOUNT AND WIRING
1. Turn off all power supplying this equipment.
2. Panel Mount: Punch out a ¾" enclosure knockout from
the panel or the mounting location as close as possible
to the where the wires will terminate. Where other types
of mounting are required, please consult the factory.
3. Insert a ¾" close nipple to the Myers Hub provided and
attached to the Surge-Trap® SPD. Insert SPD wires
carefully through the knockout hole. Tighten a ¾" steel
conduit lock nut to secure the SPD to the enclosure (as
shown in Figure 1).
4. Connect the wires as shown in the appropriate wiring
diagram.
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INSTRUCTIONS 270353
• Do not attempt to open or tamper the Surge-Trap
device in any way as this may compromise performance
and will void the warranty.
• Megger and hi-potential tests may damage the device.
• Disconnect all power supplying the equipment and
isolate the Surge-Trap device before testing.
• Prior to installation, confirm that the Surge-Trap is rated
for the correct voltage, current and frequency equivalent
to the application.
• For use in NEMA Type 1 through 4X Applications.
¾" close nipple
¾" steel conduit
locking nut
5. Overcurrent Protection: Type 1 SPDs are UL Listed
and tested to be self-protecting. They do not require
upstream protection according to UL 1449 and Section
285 of the NEC. However, we recommend an upstream
disconnect or breaker for maintenance and safety.
Many switches and circuit breakers have limitations
regarding more than one wire in a connector. Breaker
manufacturers can provide information on the limitations
of their available terminals. Where additional wires
are prohibited under the same terminal, many times
installing a new circuit breaker is convenient. Typical
sizes are 15, 20 and 30 amps.
6. For optimal device performance, use shortest wire
length of wire as possible. Cut off the excess wire
instead of coiling it up. Avoid sharp bends.
7. Before energizing, installer shall verify service and
separately derived system Neutral to Ground bonding
jumper per the NEC requirements.
CAUTION
Figure 1 Panel Mount