Conductor Routing
CurrentGuard
™
and CurrentGuard Plus
™
Installation, Operation and Maintenance Manual
6
CAUTION:
CurrentGuard’s performance will be limited
severely if the conductors are (a) too long, (b) are of too small
a wire gauge, (c) have too many bends or (d) have sharp
!
The factors listed above should be addressed during the design of an
installation 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 appear-
ance 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.
G
RED
1
2
Fig. 4: 3-Phase, 4-Wire High-Leg
DELTA
1. Optional – All CurrentGuard Plus units can be connected without an upstream
breaker/fuse.
2. Only 40 kA units are furnished with 10 AWG conductors. All other products are
furnished with compression lugs that can accept up to #3 AWG wire.
Upstream Over-Current
Protection Device
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
60A breaker is recommended (30A 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.
