Effective February 2019
Supersedes October 2017
Technical Data 1042
250 V and 600 V cable limiters
Features and benefits:
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Cable limiters enhance multi-conductor system
reliability by isolating faulted conductors and
taking them offline while the balance of the
conductors continue delivering power to their
circuits. This is why cable limiters are often
used in utility low voltage networks and large
multi-cable per phase service entrances.
•
•
Cable limiters enhance service entrance
conductor short-circuit protection with current-
limiting performance that exceed the typical
protection offered by utility overcurrent
protective devices.
Cable limiters meet many system requirements
with 250 Vac or 600 Vac ratings for conductor
sizes from 12 AWG to 1000 kcmil and terminal
options available that make them easy to install
including:
•
•
•
•
•
Tube-to-tube (crimp)
Tube-to-offset bolt (crimp/bolt-in)
Tube-to-center bolt (crimp/bolt-in)
Compression rod-to-tube (crimp)
Bolt-to-offset bolt (bolt-in)
Product description:
Cable limiters are intended to provide short-circuit
protection to electrical systems, typically between
the transformer and service entrance. Should a
short-circuit occur, the cable limiter removes the
affected cable(s) from service and permits the
other conductors to continue delivering power.
•
Select cable limiters are UL Listed under File
E90818 for use on 600 V circuit for protection
against faults up to 200 kA.
Cable limiters are often used in utility low voltage
networks and large multi-cable per phase service
entrances.
Unlike fuses, cable limiters are selected by cable
size rather than amp rating, e.g., a “4/0” limiter
will carry the current of a 4/0 cable.
Limiters are stable, totally self-contained, static
devices with unchanging characteristics that
operate without venting ionized gases or explosive
action.
Under high short-circuit conditions, limiters cut off
fault currents within one-half cycle (0.008 second)
and reduce insulation damage from the immense
heat that is developed by sustained fault current
flow. They confine damage to the point of the
short-circuit and stop long-length cable burn-back
and striking of multiple arcs. This minimizes or
eliminates damage to adjacent conductors.