Siemens Surge Protective Device TPS3 12 - Manual (Page 10)

Optional Flush Mount Installation Considerations
The TPS3 12 and TPS3 15 are approximately 6” deep. The unit will
not mount flush unless there is at least 6” of depth clearance. The
TPS3 12 and TPS3 15 are not designed to mount flush on a typical
2 x 4 stud wall.
Back Flange Mounting: Mount as close as possible to protected panel.
Create a wall opening slightly larger than 12” high by 12” wide. See
drawing. Configure a robust backing plate inside the wall cavity
6” from the wall face such that the TPS will be supported from its
back. Note the mounting holes on the back flange. Also note that
the TPS weighs 25lbs. Be careful not to drop the unit into the wall.
Configure electrical conductor and conduit connections consistent
with Installation Instructions beginning on page 4. Carefully reattach
ribbon cables and faceplate/cover prior to energizing and testing unit.
The TPS3 12 and TPS3 15 Series are designed for back flange mounting
only. Do not attempt to install the TPS such that its weight is supported
by the front flange. The four mounting holes on the front flange are
intended to secure the front flange to the outer wall surface.
Retro-fit to an Existing Panel with No Available Breaker Positions
These can be difficult with limited options. Follow all applicable
Codes:
• Consider consolidating loads in a manner that might free breaker
positions.
• A ten foot tap rule in NEC 240.21(B)(1) allows tapping the bus as
long as the tap conductors are rated at least 10% of the ampacity
of the panel. This works well if the panel is about 600A or less:
Tap the bus, run short 6 AWG leads to the SPD. An SPD with a
Disconnect Switch allows for easier SPD servicing in the future.
If the panel starts getting large (>800A), then the conductor size
increases, which may also become too large to fit into the SPD lugs
or too cumbersome to work with. In that case, consider tapping
the bus per NEC 240.21(B)(1). Run appropriate size conductors to
a safety switch fused to 60A. Mount the SPD immediately adjacent
to the safety switch. Connect SPD to the load side of the safety
switch with 6 AWG. Keep all leads as short as possible.
• Install on Line Side by taking advantage of Type 1 SPD rating.
Consider an SPD with a Disconnect Switch.
Disconnect Switch (Opt. on TPS3 12, Std. on TPS3 15)
The disconnect switch provides manual disconnection means for
phase conductors and the neutral conductor. Ground is not switched.
Special care should be taken while pre-planning installation to
ensure that leads are as short as possible. Most TPS3 12’s & TPS3
15’s in ‘square’ enclosures have backplanes that can be removed and
repositioned to reduce leads. See Figure 6. (Models with rectangular
enclosures may be repositioned by inverting only.) (Excludes thru-
door handle options.)
There is limited working space around the Disconnect Switch.
This is a consequence of reducing internal size and lead lengths.
Please be patient.
Disconnect switch will accept 6 AWG to 1/0 AWG, with 6 AWG preferred.
Torque connections to 18 inch-pounds. Over-torquing connections
will fail the disconnect switch and will not be covered by warranty.
The disconnect switch is mounted on DIN-rail. It may be removed
by gently pulling out the mounting tab at the bottom of the switch
assembly.
Siemens TPS is one of few SPD manufacturers that offer Disconnect
Switches available as a fully UL qualified option. The Short Circuit
Current Rating posted on the UL label of the SPD includes the
Disconnect Switch and supercedes any rating on the individual
Disconnect Switch. When used in a Type 1 line-side application, the
SPD including its Disconnect Switch has been UL tested and approved.
Further evaluation is not required by UL, nor is a separate UL 98 rated
switch required.
UL 1283 required language concerning the installation of EMI Filters
a) An insulated grounding conductor that is identical in size and
insulation material and thickness to the grounded and ungrounded
circuit supply conductors, except that it is green with or without
one or more yellow stripes, is to be installed as part of the circuit
that supplies the filter. Reference should be made to Table 250-122
of the National Electrical Code regarding the appropriate size of the
grounding conductor.
b) The grounding conductor mentioned in item a is to be grounded to
earth at the service equipment or other acceptable building earth ground
such as the building frame in the case of a high-rise
steel-frame structure.
c) Any attachment-plug receptacles in the vicinity
of the filter are to be of a grounding type, and the
grounding conductors serving these receptacles
are to be connected to earth ground at the service
equipment or other acceptable building earth
ground such as the building frame in the case of
a high-rise steel-frame structure.
d) Pressure terminal or pressure splicing connectors
and soldering lugs used in the installation of the
filter shall be identified as being suitable for the
material of the conductors. Conductors of dissimilar
metals shall not be intermixed in a terminal or
splicing connector where physical contact occurs
between dissimilar conductors unless the device is
identified for the purpose and conditions of use.
Figure 6: Flush Mount Installation
Step 2:
Mount SPD
Step 3:
Install Flush
Mount Plate
& Cover
Cutout slightly
larger than SPD base
Mounting Plate
6 1/16” from
outside of front
wall
STEP 1:
Prepare Wall -
Must support
25-55lbs
7