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NELSON
NC CONSTANT WATTAGE HEATER CABLE INFORMATION
SPECIFICATION/APPLICATION
Description:
Nelson Type NC constant wattage
heater cable is a parallel resistance
electric heater strip. A fluoropolymer
sheath material is extruded over the two
multi-stranded, nickel-plated, 12-gauge
copper bus wires. The nichrome heating
element is spirally applied around
parallel
• Optional Overjacket
• Standard Metal Braid
• Outer Fluoropolymer Jacket
• Resistance Wire
construction and in contact with the bus
wires at specific intervals known as
zones. A fluoropolymer outer jacket is
then extruded over the construction to
provide dielectric strength, moisture
resistance, and for protection from
impact and abrasion damage.
NC4-CB
NC8-CB
NC26-CB
NC210-CB
NC212-CB
• Stranded Plated Copper Conductors
• Fluoropolymer Insulated Bus Wires
• Inner Fluoropolymer Jacket
A stranded tinned copper metal braid
is supplied on all heaters. An optional
stainless steel braid is available for
mechanical abuse situations. An optional
fluoropolymer overjacket can be specified
when the heater cable is to be installed in
wet or corrosive environments.
Principle of Operation:
The parallel bus wires supply
voltage along the entire length of the
heater cable. A resistance wire heating
element is spirally wrapped around bus
wires contacting alternate bus wires at
specific intervals forming heating zones.
This series of parallel heating zones
provides a constant
Application:
Nelson's Type NC constant wattage
heater cable is ideal for use in maintaining
fluid flow under low ambient conditions.
Freeze protection and process
temperature maintenance systems such
as product pipelines, fire protection,
process water, dust suppression systems,
lube oil, condensate return, hot water and
structure de-icing are typical applications
for this product.
The base product is supplied with a
tinned copper metal braid that may
power output for each zone, irrespective
of where the cable is cut along the length
of the bus wires.
Each cable construction has the
heating zone resistance sized to
provide multiple power ratings when
used on different voltages. This
variation is accomplished by the
be used in both general applications and in
dry, non-corrosive hazardous (classified)
areas. It is also used to provide a
conductive ground path when cable is
installed on nonconductive surfaces, such
as plastic or painted pipe.
use of different spiral wrap spacings
and heater zone lengths.
There is no change of power
output as the temperature changes,
giving a steady power output
anywhere in its recommended
operating range.
NELSON™ SPECIFICATION/APPLICATION
NC CONSTANT WATTAGE HEATER CABLE INFORMATION
Performance and Rating Data:
Catalog Service Maximum Maintenance Maximum
Number Voltage Watts/Ft. Length Temperature Exposure T-Rating
NC4 120 4.0 405 300°F 400°F T3
208 12.0 405 150°F 400°F T3
NC8 120 8.0 285 210°F 400°F T3
120 1.5 665 300°F 400°F T3
208 4.5 665 285°F 400°F T3
NC26 220 5.0 665 270°F 400°F T3
240 6.0 665 245°F 400°F T3
277 8.0 665 210°F 400°F T3
120 2.5 515 300°F 400°F T3
NC210 208 7.5 515 215°F 400°F T3
220 8.5 515 200°F 400°F T3
240 10.0 515 175°F 400°F T3
120 3.0 470 300°F 400°F T3
NC212 208 9.0 470 190°F 400°F T3
220 10.0 470 175°F 400°F T3
240 12.0 470 150°F 400°F T3
Circuit Breaker Selections:
Catalog 115/120/VAC 208/220 VAC 240/277 VAC
Number Volts Watts/Ft. 15A 20A 30A 15A 20A 30A 15A 20A 30A
NC4 120 4.0 385 405 - - - - - - -
208 12.0 - - - 210 285 405 - - -
NC8 120 8.0 185 255 285
120 1.5 665 - - - - - - - 208 4.5 - - - 590 665 - - - -
NC26 220 5.0 - - - 555 665 - - - 240 6.0 - - - - - - 500 665 277 8.0 - - - - - - 430 590 665
120 2.5 515 - - - - - - - -
NC210 208 7.5 - - - 340 470 515 - - 220 8.5 - - - 320 445 515 - - 240 10.0 - - - - - - 295 400 515
120 3.0 470 - - - - - - - -
NC212 208 9.0 - - - 285 390 470 - - 220 10.0 - - - 265 365 470 - - 240 12.0 - - - - - - 245 330 470
MAXIMUM CIRCUIT LENGTH (FEET) BY CIRCUIT BREAKER SIZE
Maximum
- - - - - -
NOTES:
1. Circuit breakers are sized per article 427-4 of N.E.C.
2. When using 2 or more heater cables of different wattage ratings in parallel on a single circuit breaker, use the 15A
column amperage of 15 amps, divide it by the maximum footage to arrive at an amps/foot figure for each cable. You
can then calculate circuit breaker sizes for these combination loads. These amps/foot factors include the N.E.C. sizing
factor in Article 427- 4.
3. Heater cables with CB optional constructions contain a metal ground shield as required by Article 427-23 of the NEC.
4. Article 427-22 of the NEC requires ground-fault equipment protection f or e ach branch circuit supplying electric
heating equipment. Exceptions to this requirement can be found in the 1996 NEC.
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NELSON
NC CONSTANT WATTAGE HEATER CABLE INFORMATION
Power Ratings by System Voltages:
240/120 VAC
W/Ft. Voltage Cat. No.
12.0 240 NC212
10.0 240 NC210
8.0 120 NC8
6.0 240 NC26
4.0 120 NC4
3.0 120 NC212
2.5 120 NC210
1.5 120 NC26
Maximum Allowable Wattage Based on
Maintenance Temperature:
SPECIFICATION/APPLICATION
220/115 VAC
W/Ft. Voltage Cat. No.
10.0 220 NC212
8.5 220 NC210
7.3 115 NC8
5.0 220 NC26
3.7 115 NC4
2.7 115 NC212
2.3 115 NC210
1.4 115 NC26
W/Ft. Voltage Cat. No.
12.0 208 NC4
9.0 208 NC212
8.0 120 NC8
7.5 208 NC210
4.5 208 NC26
4.0 120 NC4
3.0 120 NC212
2.5 120 NC210
1.5 120 NC26
208/120 VAC
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NELSON
NC CONSTANT WATTAGE HEATER CABLE INFORMATION
Catalog Numbers: Standard Feature Suffix:
Voltage NC4 NC8 NC26 NC210
120VAC 4.0 8.0 1.5 2.5 3.0
208VAC 12.0 - 4.5 7.5 9.0
220VAC - - 5.0 8.5 10.0
240VAC - - 6.0 10.0 12.0
277VAC - - 8.0 - -
SPECIFICATION/APPLICATION
RATED WATTS PER FOOT
Basic Catalog Numbers
NC212
-CB Tinned Copper Braid
Approvals:
FM
Ordinary Locations
Hazardous /Classified/ Locations
(-CB)
Class I; Division 2; Groups B, C, D
Class II; Division 2; Groups F, G
Class III; Division 2
Accessories:
• Connection Kits for Power Connection, Tee Splice, Splices and End Seals (Nelson LT, PLT and ALT Series)
• Thermostatic Controls (Nelson TA, TH, TE and HC Series)
• Junction Boxes, Tapes and Warning Signs
• Custom Control, Monitoring and Po wer Panels
Nelson Heat Tracing Systems products are supplied with a limited warranty. Complete Terms and Conditions may be found on Nelson's website at
www.nelsonheaters.com.
NELSON HEAT TRACING SYSTEMS • P O BOX 726 • TULSA, OK 74101 • 918-627-5530 • FAX 918-641-7336 • www.nelsonheaters.com 312-SA-001
© 2006 Nelson Heat Tracing Systems May 2006
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