Chromalox RTBC, RTBC-EP Installation Instructions Manual
Chromalox
®
DIVISION 4 SECTION RT
SALES
REFERENCE
DATE
SERVICE REFERENCE
Installation Instructions
PJ454-6
161-562765-001
OCTOBER, 1998
(Supersedes PJ454-5)
© 1998 Wiegand Industrial Division, Emerson Electric Co.
GENERAL
WARNING: Hazard of Electric Shock. Disconnect all
power before starting. All installations must be
effectively grounded in accordance with the
National Electrical Code to eliminate shock hazard.
Note: All electrical wiring, including GFCI (Ground Fault Circuit
Interrupters), must be done according to National Electrical or local
codes by a qualified person.
These kits are designed to provide temperature control as well as
power termination for one run of Rapid Trace Heating Cable. Select
and purchase one grommet for terminating the cable. Please refer to
the list below to insure that you purchase the proper grommet for the
cable you are installing.
GR1 for SRL-C
GR2 for SRL-CR or SRL-CT
GR3 for CWM-C
GR4 for CWM-CT
GR5 for SRL-MC
GR6 for SRL-MCR or SRL-MCT
GR7 for SRM/E-C
GR8 for SRM/E-CT
Each kit contains enough material to make one power connection. Materials required for installation include: Standard electrical cutters, sharp utility knife, screwdriver and a pipestrap
(Chromalox PS type or equal).
Wipe inside lip of cover with a clean cloth. Removing protective backing from the gasket and affix it to the cover lip. Press
firmly all around for proper adhesion.
RTBC and R TBC-EP
Power Connection Kit With Integral Thermostat
INSTALLATION
Note: These instructions are for all Self-Regulating and Constant
Wattage Heating Cables in ordinary locations. Consult factory for
installation of braided cable in hazardous locations. Not all
instructions, however, are for all cases. Each step of the instructions will have a heading in boldface stating which type of cable
or connection each instruction is intended for.
1. FOR CONSTANT WATTAGE CABLE:
Cut the cable 12 inches past the last module point (indentation
in cable). Note: Cutting the cable between module points creates a non-heating cold lead. See Figure 1.
Figure 1
12”
Module Point
RTBC Kit Parts:
1 — Molded Enclosure consisting of Base — Box — Lid
1 — Three Position Terminal Block
1 — Mounting Screw for Terminal Block
1 — Uninsulated Barrel Connector (RTBC-EP Only)
1 — Eight Inch Length of 14AWG Insulated Wire with
Connector (RTBC Only)
1 — Ring Connector (RTBC Only)
1 — Thermostat with Mounting Screws (2)
1 — Capillary Grommet
1 — Cover Gasket
4 — Cover Screws, 5/8” Long
4 — Box Screws, 1” Long
NOTICE: These thermostats are designed for temperature control service only.
Because they may not fail safe, they should not be used for temperature limiting duty.
WARNING: Users should install adequate back-up controls and
safety devices with their electric heating equipment. Where the
consequences of failure may be severe, back-up controls are
essential. Although the safety of the installation is the responsibility of the user, Chromalox will be glad to make equipment
recommendations.
RTBC
RTBC-EP
http://www.chromalox.com
INSTALLATION
2. FOR CABLE WITH EXPOSED METAL BRAID (-C):
Push the braid back 12 inches on the cable. See Figure 2.
3. FOR ALL CABLE:
Feed the end of the cable through the appropriate hole in
the base. Allow 8 inches of cable to extend above the top of
the base. See Figure 3.
4. FOR ALL CABLE:
Slide cable grommet over the end of the cable and insert it into
the opening in the base. Attach the base to the pipe by threading
the appropriate sized pipestrap through the slot in the mounting
plate. Tighten the pipestrap until the base is loosely attached to
the pipe. See Figure 4.
5. FOR OVERCOATED CABLES (-CR or -CT):
Score the outer insulation 1-1/2 inches from the end of
the cable. Remove the jacket to expose the metal braid. See
Figure 5. WARNING: Do not damage the braid or the base
cable insulation.
6. FOR ALL CABLE:
Punch out the knockouts on the bottom of the box which correspond to the openings in the base through which the heating
cable passes. For these kits, the openings to be knocked out
are the ones opposite the conduit entry and the one by the side
of the box. Be careful to punch out only those knockouts to be
used. If one is mistakenly punched, blank grommets can be
ordered to re-establish the watertight seal. See Figure 6.
7. FOR ALL CABLE:
Feed the capillary of thermostat through the side hole of the box
and side hole of the base. Slip the grommet over the capillary
between the box and the base. See Figure 7.
8. FOR ALL CABLE:
Feed the cable through the end hole in the box. Allow 3/4 inches of stainless steel capillary to extend above the bottom of the
box. Secure box to base using all four large (8-32) screws. See
Figure 8.
9. FOR OVERCOATED CABLE:
Starting from the end of the cable. unravel 1-1/2 inches of the
braid. Twist the strands together to form a pigtail. See Figure 9.
10.FOR SELF-REGULATING CABLE:
Using standard electrical cutters, cut a 3/4 inch long notch out
of the cable between the conductor wires. Bare a 3/8 inch
length of each conductor by stripping off the outside insulation and the inner black core material. See Figure 10.
11.FOR CONSTANT WATTAGE CABLE:
Score the outer jacket 3/4 inch from the end of the cable and
remove the jacket. Cut off the exposed nichrome wire, pushing
any remainder back under the jacket. Constant Wattage cables
have an inner layer of insulation which is also to be removed
as described above. Separate the buss wires and strip off the
last 3/8 inch of insulation from both buss wires. See Figure 11.
Figure 2
12”
Figure 3
Figure 4
Figure 5
1-1/2”
8”
Figure 6
Figure 7
Figure 8
Figure 9
1-1/2”
Figure 10
Figure 11
1-1/2”
3/4”
3/8”
3/4”
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