6
CURRENT TECHNOLOGY
®
CURRENTGUARD
TM
COMPACT INSTALLATION, OPERATION AND MAINTENANCE MANUAL
Upstream Over-Current
Protection Device
Mounting
All CurrentGuard series units must be connected in parallel with the electrical
system . CurrentGuard units have built-in over-current fusing rated at 200,000
rms symmetrical ampere up to 600VAC or less and can be connected
directly to the electrical distribution system bus without an upstream over-
current protection device (OCPD) . However, the use of an external OCPD is
recommended .
If the SPD is connected to a dedicated overcurrent protection device, a 30A
breaker is recommended (15A minimum, 200A maximum) . The advantage
of using a dedicated over-current device for the SPD (even if the upstream
breaker is 200A or less) is that it allows the SPD to be de-energized during
service without disturbing the electrical service to the rest of the facility .
CurrentGuard can be mounted in a variety of methods . The basic method is
to wall mount using the mounting feet attached to the base of the enclosure .
CurrentGuard can also be mounted even (or flush-mount) to the exterior wall
surface . Mount CurrentGuard using construction methods and hardware
appropriate for your site . The CurrentGuard enclosure is designed with a
3/4-inch myers hub which will accept rigid or IMC conduit . See Figure 4 for
enclosure and mounting dimensions .
Plan Your Installation
✓
Following all applicable National Electrical Code standards as well as state
and local codes, connect phase, neutral* and ground to CurrentGuard .
CurrentGuard units come with 36" of #10 AWG conductors . Ensure that the
conductor lengths are kept as short and straight as possible .
CAUTION:
CurrentGuard’s performance will be limited severely if the
conductors are (a) too long, (b) have too many bends or (c) have sharp bends .
The factors listed above should be addressed during the design of an installa-
tion to reserve a suitable place for CurrentGuard next to its point of connection
to the electrical system . The selected mounting location should allow for the
shortest possible conductor runs and a direct route with a minimum of bends .
If bends are required, they should be
sweeping
bends . Do not make sharp
90° bends for appearance purposes because they will severely decrease the
effectiveness of CurrentGuard .
Binding or twisting conductors together using tie-wraps or electrical tape
increases the protection performance of the device .
* The 3-wire plus ground Delta CurrentGuard does not have a neutral
conductor
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