When severe winter weather hits, unprotected piping, valves, and fluid lines face severe freeze-up risks. Industrial facilities, commercial buildings, and processing plants rely on self-regulating heat trace cables to maintain continuous fluid flow, protect equipment, and prevent pipe bursts.
BriskHeat offers two primary low-temperature self-regulating heating cable product lines engineered for freeze protection: the SLCBL and SLCAB series. While both utilize advanced conductive polymer technology, key differences in approvals, location ratings, and outer jacket constructions determine which cable fits your specific project specifications.
What is Self-Regulating Heat Trace Technology?
Unlike constant-wattage heating cables, self-regulating cables automatically adjust their thermal power output based on ambient and pipe surface temperatures at every point along the line.
Key Advantages of BriskHeat Self-Regulating Cable:
- Overlapping Safety: Cables can safely overlap on valves, elbows, and flanges without creating localized hot spots or burnout risk.
- Cut-to-length Field Installation: Cable can be cut and terminated on-site to match exact piping geometry without pre-measuring restrictions.
-
Energy Savings: Thermal output dynamically scales down as ambient temperatures rise, reducing unnecessary power consumption.
BriskHeat SLCBL vs SLCAB: Specification Comparison
Both cables deliver low-temperature freeze protection maintaining temperatures up to 150°F (65°C) with a maximum continuous exposure limit of 185°F (85°C). However, environmental hazards and electrical codes dictate proper selection.
| Feature | BriskHeat SLCBL | BriskHeat SLCAB |
|---|---|---|
| Primary Application | Commercial & General Industrial Freeze Protection |
|
| Nominal Power Output | 3, 5, 8, 10 W/ft | 3, 5, 8, 10, 12 W/ft |
| Voltage Options | 120V, 208-277V | 120V, 208-277V |
| Max Continuous Maintenance Temp | 150°F (65°C) | 150°F (65°C) |
| Intermittent Exposure Temp | -40°F to 185°F (-40°C to 85°C) | -20°F to 185°F (-29°C to 85°C) |
| Minimum Installation Temp | -40°F (-40°C) | -40°F (-40°C) |
| Hazardous Location Ratings | Class 1, Div 2; Class II, Div 2; Class III | Class I, Div 1 & 2; Class II, Div 1 & 2; Class III |
Selecting the Right Outer Layer/Jacket Option
Both SLCBL and SLCAB series offer varying outer layer options. Selecting the correct outer layer ensures long-term resistance against environmental factors, moisture, and chemical exposure.
| Cable Line | Cable Suffix | Outer Construction | Mechanical Protection | Moisture Resistance | Chemical/Solvent Exposure | Recommended Applications |
|---|---|---|---|---|---|---|
| SLCBL | -B | Tinned Copper Metal Braid | High | Low | None | Dry, indoor, industrial piping |
| SLCBL | -BP | Tinned Copper Metal Braid + Thermoplastic Elastomer Overjacket | High | Excellent | Wet/Weak Chemicals | Outdoor pipes, washdown zones, wet locations, exposure to mild inorganic acids |
| SLCBL | -BF | Tinned Copper Metal Braid + Fluoropolymer Overjacket | High | Superior | Strong Chemicals | Chemical processing plants, refineries, aggressive chemical splash zones |
| SLCAB | -B | Tinned Copper Metal Braid | High | Low | None | Dry, indoor, industrial piping |
| SLCAB | -BP | Tinned Copper Metal Braid + Thermoplastic Polyolefin Overjacket | High | Excellent | Wet/Weak Chemicals | Outdoor pipes, washdown zones, wet locations, exposure to mild inorganic acids |
| SLCAB | -BF | Tinned Copper Metal Braid + Fluoropolymer Overjacket | High | Superior | Strong Chemicals | Chemical processing plants, refineries, aggressive chemical splash zones |
| SLCAB | -SS | Stainless Steel Metal Braid | High | Low | None | Dry, indoor, industrial piping where additional corrosion resistance is required |
Electrical Planning & Design Considerations
Proper electrical design prevents circuit breaker tripping during cold-start conditions and ensures uniform thermal distribution across long piping runs.
Maximum Circuit Length Reference Guide
Circuit length limits depend on the cable wattage rating, supply voltage, and breaker amperage. The charts below provide max cable run lengths based on 50°F (10°C) and -4°F (-20°C) for SLCBL lines and 50°F (10°C) and 0°F (-18°C) for SLCAB lines.
| SLCBL Low Temperature Self-Regulating Heat Trace | |||||
|---|---|---|---|---|---|
| Cable Output Rating | Circuit Breaker Rating | Max Circuit Length at 120V | Max Circuit Length at 240V | ||
| Start-Up Temp at 50°F (10°C) | Start-Up Temp at -4°F (-20°C) | Start-Up Temp at 50°F (10°C) | Start-Up Temp at -4°F (-20°C) | ||
| 3 W/ft SLCBL3120/SLCBL3240 |
15A | 320 ft (98 m) | 220 ft (67 m) | 643 ft (196 m) | 436 ft (133 m) |
| 20A | 330 ft (101 m) | 265 ft (81 m) | 660 ft (201 m) | 530 ft (162 m) | |
| 30A | 330 ft (101 m) | 280 ft (85 m) | 660 ft (201 m) | 557 ft (170 m) | |
| 40A | 330 ft (101 m) | 280 ft (85 m) | 660 ft (201 m) | 557 ft (170 m) | |
| 5 W/ft SLCBL5120/SLCBL5240 |
15A | 249 ft (76 m) | 170 ft (52 m) | 498 ft (152 m) | 337 ft (103 m) |
| 20A | 265 ft (81 m) | 215 ft (66 m) | 530 ft (162 m) | 433 ft (132 m) | |
| 30A | 265 ft (81 m) | 240 ft (73 m) | 530 ft (162 m) | 480 ft (146 m) | |
| 40A | 265 ft (81 m) | 240 ft (73 m) | 530 ft (162 m) | 480 ft (146 m) | |
| 8 W/ft SLCBL8120/SLCBL8240 |
15A | 177 ft (54 m) | 90 ft (27 m) | 354 ft (108 m) | 183 ft (56 m) |
| 20A | 200 ft (61 m) | 115 ft (35 m) | 406 ft (124 m) | 229 ft (70 m) | |
| 30A | 210 ft (64 m) | 175 ft (53 m) | 420 ft (128 m) | 350 ft (107 m) | |
| 40A | 210 ft (64 m) | 175 ft (53 m) | 420 ft (128 m) | 350 ft (107 m) | |
| 10 W/ft SLCBL10120/SLCBL10240 |
15A | 121 ft (37 m) | 65 ft (20 m) | 242 ft (74 m) | 131 ft (40 m) |
| 20A | 150 ft (46 m) | 80 ft (24 m) | 295 ft (90 m) | 164 ft (50 m) | |
| 30A | 155 ft (47 m) | 105 ft (32 m) | 315 ft (96 m) | 215 ft (66 m) | |
| 40A | 180 ft (55 m) | 105 ft (32 m) | 360 ft (110 m) | 215 ft (66 m) | |
| 12 W/ft SLCBL12120/SLCBL12240 |
15A | 90 ft (27 m) | 45 ft (14 m) | 183 ft (56 m) | 91 ft (28 m) |
| 20A | 115 ft (35 m) | 60 ft (18 m) | 229 ft (70 m) | 124 ft (38 m) | |
| 30A | 115 ft (35 m) | 80 ft (24 m) | 229 ft (70 m) | 158 ft (48 m) | |
| 40A | 120 ft (37 m) | 80 ft (24 m) | 240 ft (73 m) | 158 ft (48 m) | |
| SLCAB Low Temperature Self-Regulating Heat Trace | |||||
|---|---|---|---|---|---|
| Cable Output Rating | Circuit Breaker Rating | Max Circuit Length at 120V | Max Circuit Length at 240V | ||
| Start-Up Temp at 50°F (10°C) | Start-Up Temp at 0°F (-18°C) | Start-Up Temp at 50°F (10°C) | Start-Up Temp at 0°F (-18°C) | ||
| 3 W/ft SLCAB3120/SLCAB3240 |
15A | 300 ft (91 m) | 200 ft (61 m) | 660 ft (201 m) | 410 ft (125 m) |
| 20A | 270 ft (82 m) | 560 ft (171 m) | |||
| 30A | 330 ft (100 m) | 660 ft (201 m) | |||
| 5 W/ft SLCAB5120/SLCAB5240 |
15A | 230 ft (70 m) | 150 ft (46 m) | 460 ft (140 m) | 300 ft (91 m) |
| 20A | 270 ft (82 m) | 200 ft (61 m) | 540 ft (164 m) | 400 ft (122 m) | |
| 30A | 270 ft (82 m) | 540 ft (164 m) | |||
| 10 W/ft SLCAB10120/SLCAB10240 |
15A | 150 ft (46 m) | 95 ft (29 m) | 295 ft (90 m) | 195 ft (59 m) |
| 20A | 200 ft (61 m) | 125 ft (38 m) | 390 ft (119 m) | 250 ft (76 m) | |
| 30A | 210 ft (64 m) | 190 ft (58 m) | 420 ft (128 m) | 375 ft (114 m) | |
| 40A | 210 ft (64 m) | 420 ft (128 m) | |||
| 12 W/ft SLCAB12120/SLCAB12240 |
15A | 115 ft (35 m) | 70 ft (21 m) | 230 ft (70 m) | 150 ft (46 m) |
| 20A | 150 ft (46 m) | 95 ft (29 m) | 305 ft (93 m) | 200 ft (61 m) | |
| 30A | 180 ft (55 m) | 145 ft (44 m) | 360 ft (110 m) | 300 ft (91 m) | |
| 40A | 180 ft (55 m) | 360 ft (110 m) | |||
Operating Voltage & Thermal Output Multipliers
When operating 240V-rated cable at a non-standard system voltage (such as 208V or 277 V), calculate actual power density using the adjustment factors below.
| SLCBL Voltage Adjustment Factors | ||||
|---|---|---|---|---|
| Product SKU | 208 VAC | 277 VAC | ||
| Watt/ft Output Adjustment |
Max Circuit Length Adjustment |
Watt/ft Output Adjustment |
Max Circuit Length Adjustment |
|
| SLCBL3240 | 0.82 | 0.96 | 1.13 | 1.08 |
| SLCBL5240 | 0.85 | 0.94 | 1.12 | 1.09 |
| SLCBL8240 | 0.89 | 0.92 | 1.08 | 1.11 |
| SLCBL10240 | 0.89 | 0.92 | 1.08 | 1.11 |
| SLCBL12240 | 0.89 | 0.92 | 1.08 | 1.11 |
| SLCAB Output Adjustment Factor | ||
|---|---|---|
| Product SKU | 208 VAC | 277 VAC |
| SLCAB3240 | 0.75 | 1.28 |
| SLCAB5240 | 0.86 | 1.16 |
| SLCAB8240 | 0.91 | 1.10 |
| SLCAB10240 | 0.91 | 1.08 |
What Connection Accessories are Required for Field Installation?
A complete heat trace installation is rarely a single continuous line. Accessory counts depend on the physical complexity of your pipe run, taking into consideration how many cuts, splices, branch runs, and control sensors your piping layout requires.
Potential Accessory Needs for Pipe Runs
| Installation Variable | Impact on Accessories & Kit Counts | Required BriskHeat Component |
|---|---|---|
| Power Feed Location | Every independent home-run circuit requires a connection to a junction box | Power Connection Kit |
| Pipping Tee & Branches | Running heat trace onto branch lines or manifolds splits the primary feed | Tee/Splice Kits |
| Line Extensions & Repairs | Joining two cable lengths or repairing field-damaged sections | In-line Splice Kits |
| Cable End Terminations | Every cut cable end (main run and all branch legs) must be sealed against moisture | End Seal Kits |
| Temperature Control | Simple ambient switching vs. precise line-sensing temperature regulation | Thermostat/Digital Controller + Sensors (if necessary) |
Installer Tip: While every circuit requires at least one power connection kit and one end seal kit, your total component count scales directly with your piping layout.
- Base Circuit Rule: Every independent circuit requires 1 power connection kit + 1 end seal kit minimum.
- Tees & Branch Lines: Add 1 tee splice kit and 1 extra end seal kit for every secondary line split off the main header.
- Inline Extensions: Add 1 in-line splice kit for reel-to-reel joints or inline repairs.
- Secure cable with fiberglass or aluminum tape spaced every 12 inches (300 mm).
- While a controller is not required for self-regulating cable, it does provide additional safety and energy efficiency for the heat trace system.
Outside of these accessories, another main component that is not required but highly recommended and aids in energy efficiency would be insulation. BriskHeat offers INSUL-LOCK flexible closed cell pipe insulation or a custom built insulators for your exact needs.
Self-Regulating Heat Trace - Frequently Asked Questions
Q: Can BriskHeat self-regulating heating cables be installed on plastic (PVC or PEX) piping?
A: Yes, however, plastic can refer to many different materials with a broad range of thermal properties. The standard schedule 40 PVC pipe that is not under pressure can be heat traced with the right cable as long as it stays under 140°F. Self-regulating cable like SLCBL with a 3 W/ft output is ideal in general freeze protection scenarios. We always suggest that you check the maximum exposure temperature of the pipe/surface you are trying to heat to make sure it aligns with the heat trace solution you are wanting to use.
Q: How do cold-start ambient temperatures affect circuit breaker sizing?
A: When self-regulating cable is energized in extremely cold conditions (e.g., 0°F / -18°C), the core resistance is low, generating a temporary spike in electrical current known as inrush current. The breaker must be sized to handle this initial peak—which lasts a few seconds to a few minutes—without tripping. Always check the cold-start circuit length charts rather than sizing breakers strictly off continuous operating current.
Q: How do I test BriskHeat heat trace cable before and after installation?
A: Before, during, and after installing insulation, perform a megohmmeter (Megger) test between the two copper bus wires and the outer metallic braid at 500 VDC (minimum). A reading of at least 20 Megohms confirms that the insulation resistance is intact and no physical damage or moisture ingress occurred during pulling or taping.
Q: What is the difference between Class I, Div 1 and Class I, Div 2 approvals for SLCBL vs SLCAB?
A: Class I, Div 2 (SLCBL & SLCAB): Covers locations where flammable gases or vapors are handled, processed, or used, but are normally confined within closed containers and only escape under abnormal operating conditions.
Class I, Div 1 (SLCAB with BF1 outer jacket only): Covers locations where ignitable concentrations of flammable gases or vapors exist continuously, intermittently, or periodically under normal operating conditions. SLCAB meets the stricter construction and testing mandates required for these environments.
Additional Questions
Looking to prepare for freeze protection or have additional questions on a heat trace system and our low temperature cable lines? Contact BriskHeat today and our team will be happy to walk through your options!
