nVent RAYCHEM 3SC-STC End Termination Kit Instruction Manual
- October 30, 2023
- nVent RAYCHEM
Table of Contents
nVent RAYCHEM 3SC-STC End Termination Kit
Product Information
The nVent RAYCHEM 3SC-STC is a NEMA 4-rated end termination kit designed for use with RAYCHEM 3SC30, 40, 50 (-CT), 3SC/H30, 40, 50 (-CT) and 3SC/F30, 40, 50 (-CR) series heating cables in hazardous locations. The kit is approved for use in Class I, Div. 2, Groups A, B, C, D Class II, Div. 2, Groups F, G Class III -W for Canada hazardous locations. The kit is designed to prevent shock or fire and must be installed correctly to ensure proper operation.
Tools and Materials Required
- Crimp tools can be ordered from nVent.
- Silicone rubber compound Part A and Part B
- Thomas & Betts #C10-14 ring terminal
- Bolt, lock washer, and nut
- Parallel splices (small and large)
- Tape strips (3 required, 2 extra)
- Pipe clamp banding kit
- Cable lubricant
Installation Instructions
- Read all installation instructions carefully before starting the installation process.
- Ensure that the power supply is disconnected before beginning the installation process.
- Identify the appropriate heating cable splice conductor size from the table provided above.
- Strip the outer jacket of the heating cable at the score and peel off the jacket.
- Separate the tinned-copper braid from the heating cable.
- Peel off the fiberglass braid (only for 3SC, 3SC/H) from the heating cable.
- Crimp the Thomas & Betts #C10-14 ring terminal onto the splice conductor using the appropriate crimp tool die.
- Slide the bushing onto the heating cable with the hex side facing outwards.
- Slide the grommet onto the heating cable and position it over the braid.
- Insert the heating cable through the box cover with the grommet and bushing inside the box.
- Place the box cover onto the box and secure it with the two screws provided.
- Thread the bolt, lock washer, and nut through the plug and tighten it onto the box cover.
- Wrap three tape strips around the box cover and heating cable, starting at the bottom of the box and wrapping around and down as shown in the diagram.
- Apply cable lubricant to the splice and slide it into the grommet.
- Pour Part A of the silicone rubber compound into a clean container and add Part B, then stir thoroughly with a stir stick.
- Pour the mixed silicone rubber compound into the box to pot the splice and fill any voids.
- Apply two additional tape strips over the silicone rubber compound to secure it in place.
- Secure the heating cable to the pipe using the pipe clamp banding kit provided in the kit.
- Attach the ETL-END seal label to the box cover.
APPROVALS
Hazardous Locations
- Class I, Div. 2, Groups B, C, D
- Class II, Div. 2, Groups F, G
- Class III
- Class I, Div. 2, Groups A, B, C, D
- Class II, Div. 2, Groups F, G
- Class III -W for Canada
(1) for T-Rating, see design documentation
DESCRIPTION
The nVent RAYCHEM 3SC-STC is a NEMA 4 rated end termination kit designed for use with RAYCHEM 3SC30, 40, 50 (-CT), 3SC/H30, 40, 50 (-CT) and 3SC/F30, 40, 50 (-CR) series heating cables in hazardous locations. This kit may be installed at temperatures as low as –40°F (–40°C). For easier installation, store above freezing until just before installation. For technical support, call nVent at (800) 545-6258.
TOOLS REQUIRED
- Utility knife
- Wire strippers
- Disposable towel or rag
- Adjustable wrench
- Solder tool or torch (with a small tip)
- Thomas & Betts WT2000 crimp tool or equivalent (P/N 273435-000] Crimp tools can be ordered from nVent.
- Diagonal cutters
- 1/4 in. hex key
- Slotted screwdriver
ADDITIONAL MATERIALS REQUIRED
- Glass cloth tape:
- GT-66 for installation temperature above 40°F (4°C)
- GS-54 for installation temperature above –40°F (–40°C)
WARNING
This component is an electrical device that must be installed correctly to
ensure proper operation and to prevent shock or fire. Read these important
warnings and carefully follow all of the installation instructions.
- To minimize the danger of fire from sustained electrical arcing if the heating cable is damaged or improperly installed, and to comply with the requirements of nVent, agency certifications, and national electrical codes, ground-fault equipment protection must be used. Arcing may not be stopped by conventional circuit breakers.
- Component approvals and performance are based on the use of nVent-specified parts only. Do not use substitute parts or vinyl electrical tape.
- Damaged conductors can overheat or short. Do not break conductor wire strands when scoring the jacket or removing insulation.
- Keep components and heating cable ends dry before and during installation.
- Use only fire-resistant insulation materials, such as fiberglass wrap or flame-retardant foam.
- Soldering tools or torches can cause fire or explosion in hazardous areas. Be sure there are no flammable materials or vapors in the area before using these tools.
- Wrap exposed conductors with supplied tape strips to prevent shorts.
CAUTION
HEALTH HAZARD: Hot solder can burn eyes and skin. Fumes during soldering are irritating to the eyes and may cause headaches and respiratory system irritation or damage. Prolonged or repeated exposure to rosin flux fumes during soldering may result in allergic reactions in a sensitive person, resulting in asthma symptoms. Consult MSDS VEN0043 for further information. The silicone rubber compound, Part A and Part B, may generate flammable and explosive hydrogen gas if it comes in contact with an acidic, basic or oxidizing material. Personal contact with the silicone rubber compound may cause slight eye or skin irritation. Consult MSDS VEN0030 and VEN0031 for further information. CHEMTREC 24-hour emergency telephone: (800) 424-9300 Non- emergency health and safety information:(800) 545-6258.
KIT CONTENTS
Heating Cable Construction
Heating cable types
- 3SC30, 40 and 50 (-CT)
- 3SC/H30, 40 and 50 (-CT)
- 3SC/F30, 40 and 50 (-CR)
INSTALLATION INSTRUCTION
- Allow approximately 18 inches (46 cm) of heating cable for this installation.
- For easier installation, apply cable lubricant inside the grommet from each end.
- Slide the bushing and grommet onto the heating cable in the order and orientation shown.
- Position the box as shown.
- Lightly score the outer jacket around and down as shown.
- Bend heating cable to break jacket at the score, then peel off the jacket.
- Use a pointed object to separate the braid from the heating cable.
- Pull the braid to the same side as the small hole in the side of the box.
- Twist the braid to make a pigtail.
- Lightly score the inner jacket around and down as shown.
- Bend heating cable to break jacket at score then peel off jacket.
- Remove 5/8-inch (16 mm) of the insulation and fiberglass braid to expose the bare conductors.
- Use the Thomas and Betts WT2000 crimp tool to crimp the ring terminal to the braid.
- Twist the three conductors together.
- Use the Thomas & Betts WT2000 crimp tool to connect the three heating cable conductors (see table).
Thomas & Betts (T&B)
- The above table is also applicable for 3SC/H30, 40, 50 (-CT) and 3SC/F30, 40, 50 (-CR) heating cables. For replacement crimps, call nVent at (800) 545-6258.
WARNING: Fire and Health Hazard Soldering tools or mini torches can cause fire or explosion in hazardous areas. Be sure there are no flammable materials or vapors in the area before using these tools. Follow all site safety guidelines when working in hazardous areas. Refer to the solder material safety data sheet packaged with kit. Do not overheat or char the conductor insulation. Inhalation of fumes can cause polymer fume fever, flu-like symptoms, irritation and difficulty breathing.
- Use only the solder provided with kit. Only Kester 48 core LF has been qualified with SC kits.
- Heat splice using a soldering tool, or propane or MAPP gas torch. Note: MAPP gas may be required if the connections are being soldered at temperatures below –4°F (–20°C). Heat the center of the splice until it is hot enough to melt the solder placed at both ends.
Allow the connection to cool before proceeding to the next step.
IMPORTANT: To ensure proper electrical insulation, use the specified high-temperature Teflon® tape provided with the kit. Do not use common vinyl tape that does not have an adequate temperature rating.
- Wrap the connection with four strips of tape, covering splice and 1/4-inch (6 mm) of conductor insulation (approximately three overlapped layers).
- Wrap the braid with two tape strips.
- Center connection in the box.
- Apply cable lubricant to the outside surface of the grommet, cable, and end of the bushing as shown.
- Slide the grommet into end of box and seat to the bottom of the threaded section using a screwdriver or blunt instrument.
- Slide bushing into end of box. Screw into threaded section and tighten with a wrench.
- Position lock washer and nut on the outside of the box. Fasten the braid ring terminal using a bolt.
- Install the plug.
- Position the lock washer and nut on the outside of the box. Fasten the braid ring terminal using bolt.
- Install the plug.
- Push the braid wire as far away from the connection as possible.
- Position taped connection so it is centered and not touching the surface of the enclosure, braid wire or ground screw.
- All braid wires must be fully contained within the box. Reposition the connection if necessary.
WARNING: Health Hazard Refer to silicone rubber material safety data
sheet packaged with kit.
- Open the two containers: one labeled Part A, and the other Part B.
- Use separate wooden sticks to stir the contents of each container until smooth and homogeneous.
- Pour all the contents of the container labeled Part B into the container labeled Part A and mix thoroughly until the color is uniform.
- Pour the potting compound mixture into the box.
- Potting compound must fill the box and cover all connections.
- Secure the cover and gasket using the two screws provided.
WARNING: Fire and Shock Hazard To prevent cable damage, do not position
pipe banding over the heating cable. Ensure the cable does not cross over
itself to prevent damage to the jacket and shorting.
- Use pipe clamp banding and fasteners to secure the end seal to the pipe.
- Secure the heating cable service loop to the pipe using a glass cloth tape.
- Install ETL-END-SEAL label on insulation cladding.
- Leave these instructions with the end user for future reference.
North America
Tel +1.800.545.6258 Fax +1.800.527.5703
[email protected]
Latin America
Tel +1.713.868.4800 Fax +1.713.868.2333
[email protected]
©2022 nVent. All nVent marks and logos are owned or licensed by nVent Services GmbH or its affiliates. All other trademarks are the property of their respective owners. nVent reserves the right to change specifications without notice. RAYCHEM-IM-H57788-3SCSTC-EN-2202