KING SR User Manual

SRK00 Pipe Connection Kit

Installation, Operation and Maintenance Instructions

IMPORTANT: Save These Instructions!

DESCRIPTION:

Item Qty Description

A 1
B 1
C 1
D 1
E 3
F 4
G 1
H 2

I 1
X 1
Y 1
Z 1

www.king-electric.com 1

Bracket for pipe mounting
Weatherproof sealtite box fitting
Weatherproof seal
Lock nut
Electrical wire nuts
Labels

Black heat shrink tube (1/2” dia. x 1” length)
Black heat shrink tubes (1/8” dia. x 5-1/2” length)
Green/Yellow heat shrink tube (1/4” dia. x 6” length)
Black heat shrink tube (3/4” dia. x 5” length)
Woven braid sleeve ( ½” dia. x 4” length)
Black heat shrink cap ( ½” dia. x 1-1/4” length)

Rev 11.04.12

SR self-regulating heating cables
are designed for a variety of pipe
freeze protection as well as roof

and gutter deicing applications.
The heat output (wattage)

increases and decreases based on
the temperature, so the cable
adjusts automatically to varying
climate conditions. This unique
feature ensures maximum energy
efficiency by increasing the heat
output only when it is needed. No
thermostat is required.

DESCRIPTION

The SRK00 hard wire power connection kit is to be used with King SR self regulating heating cables only. The kits are not
approved to be used with other brands of heating cable. The kit contains enough material for making one hard wire power
connection and one end seal. King SR cables are approved for both pipe freeze protection and roof and gutter deicing
applications. The kit is to be used with copper wire only, do not use aluminum power supply wires

ADDITIONAL MATERIALS REQUIRED

• UL Listed weatherproof junction box when used outdoors.

• The junction box requires a provision for 1/2-inch conduit or 1/2-inch NPT threaded hub.

• For heating cable with no outer-jacket, a metallic junction box must be used to ensure proper grounding.

• Adjustable hose clamp when mounted on pipe.

• The application may require additional accessories; for example, SRK03 application tape for pipe applications or SRK13

roof clips and/or SRK15 downspout hangers for roof and gutter deicing.

TOOLS REQUIRED

• Adjustable wrench or pliers, needle nose pliers, diagonal cutters, utility knife, screwdriver, propane torch or heat gun,
crimp tool.

WARNING

Fire and shock hazard. Improperly installed heating cable can cause electrical shock, arcing, and fire.
Carefully follow all the instructions provided read the cautions and warnings.

1.Heating cables must be installed in compliance with the national electric code (NEC) in addition to state, provincial and local
codes. Check with your local inspector for specific code requirements (or regulations or standards) in your area.

2.Save these instructions and transfer them to future owner(s).

3.Never install on pipes that could potentially exceed 150º F, (65º C).

4.Do not substitute components or use or use vinyl electrical tape.

5. Cable should not run through the building walls, ceilings or floors.

6.For safety, King recommends that all heating cables are placed on a Ground Fault Equipment Protection (GFEP) circuit.
Consult your local electrical inspector to determine the specific requirements in your area.

7.The black heating core is conductive and can short. It must be properly insulated with heat shrink tubing.

8.Keep components and heating cable ends dry during installation.

9.Damaged bus wires can overheat or cause an electrical short. Do not energize cable if the bus wires are damaged.

10.Do not break the braid or bus wire strands when stripping the jacket or conductive core.

11.Bus wires will short if they come in contact with each other. Never spice the bus wires together, they must remain
separate.

12. Heat-damaged components can short, the use a heat gun is preferred. Use a torch with a soft, yellow ,low-heat flame, not
a high heat blue focused flame. Keep the flame moving to avoid overheating, blistering, or charring the heat-shrinkable
tubes. Avoid heating other components and replace any heat damaged parts prior to energizing the cable.

13.Use only fire-resistant insulation materials such as fiberglass wrap.

14. Do not twist he cable during installation.

15.De-energize all supply power circuits before installation or servicing.

16. Do not embedded the heating cable.

17.Post warning labels supplied with the cable at the power supply and along the pipe on the outside of the insulation.

18.Do not bend the cable to less than a 1/2” radius.

19.Do not Install cable on shingle roofs in freezing temperatures; as this may cause damage to the shingles.

20.Cables are intended for freeze protection of water pipes only. Not intended for use with other liquids or hazardous
materials.

21. Install cable in accessible areas only.

Caution: Charring or burning the heat-shrinkable tubes in this kit will produce fumes that may cause eye, shin, nose, and

throat irritation. Ensure proper ventilation during installation to avoid this health risk.

Important: For the warranty to be valid, installer must comply with all requirements outlined in these guidelines. All design

information provide her is based upon a standard installation with heating cable fastened to an insulated pipe.

Electrical codes: Article 427 of the National Electrical Code and Section 62 of CAN/CSA-C22.1, Canadian Electrical Code

govern the installation of King SR heating cable for pipe freeze protection.

www.king-electric.com 2

Rev 11.04.12

SR Heating Cable Selection and Design

Use table 1 to select the heating cable size for insulated metal pipes and use table 2 to select heating cables for
insulated plastic pipes. Read across the table to find the pipe size, then drop down the column to the row
corresponding to the lowest design air temperature column for the application and chose the thickness of the
insulation that will be used. The cell that intersects will give the power (watts/ft.) of the cable required and it may also
have a number (2) in the cell which represents using 2 cables. Run the cable straight along the bottom of the pipe. If

two cables are required, attach them at the 4 and 8 o’clock positions as shown in figure 1 page 4. Spiral tracing the

cable is not recommended as it is labor intensive.

Table 1' – SR cable selection for metal pipes (w/ft.)

Lowest

Air Temp.

0ºF

(-18ºC)

-20ºF

(-29ºC)

-40ºF

(-40ºC)

Insulation

Thickness

1/2” 3 3 3 3 5 5 5 5 8 8 10

1” 3 3 3 3 3 3 3 5 5 8 8

1-1/2” 3 3 3 3 3 3 3 3 5 5 5

2” 3 3 3 3 3 3 3 3 3 5 5

1/2” 3 5 5 5 5 5 8 8 10 10

1” 3 3 3 3 3 5 5 5 8 8 10

1-1/2” 3 3 3 3 3 3 3 5 5 8 8

2” 3 3 3 3 3 3 3 3 5 5 8

1/2” 5 5 5 5 8 8 10 (2) 8 (2) 8 (2) 10

1” 3 3 3 5 5 5 8 8 8 10 (2) 8

1-1/2” 3 3 3 3 3 5 5 5 8 8 10

2” 3 3 3 3 3 3 3 5 5 8 8
3” 3 3 3 3 3 3 3 3 3 5 5

1/2” 3/4” 1” 1-1/4” 1-1/2” 2” 2-1/2” 3” 4” 6” 8”

Table 2' – SR cable selection for plastic pipes (w/ft.)

Lowest

Air Temp.

0ºF

(-18ºC)

-20ºF

(-29ºC)

-40ºF

(-40ºC)

Insulation

Thickness

1/2” 3 5 5 5 8 8 8 10 (2) 8 (2) 10

1” 3 3 3 5 5 5 5 5 5 8 8

1-1/2” 3 3 3 3 3 3 5 8 8 8 10

2” 3 3 3 3 3 3 3 5 5 8 8

1/2” 5 5 8 8 10 10 (2) 8 (2) 8 (2) 10

1” 3 3 5 5 5 8 8 8 10 (2) 8 (2) 10

1-1/2” 5 5 5 5 5 5 5 8 8 10 (2) 8

2” 3 3 3 3 3 5 5 5 8 8 10

1/2” 8 8 8 8 10 10 (2) 8 (2) 10

1” 5 5 5 8 8 8 10 10 (2) 8

1-1/2” 5 5 5 5 5 8 8 8 10 (2) 8 (2) 10

2” 5 5 5 5 5 5 5 8 8 10 (2) 8
3” 3 3 5 5 5 5 5 5 5 8 10

1/2” 3/4” 1” 1-1/4” 1-1/2” 2” 2-1/2” 3” 4” 6” 8”

*

*

*

* *

* * *

* *

' The tables are based on a using fiberglass insulation or equivalent while maintaining a 40ºF (4ºC) pipe

temperature with a 10% safety factor and 20 mph wind speed.

* Contact King for the proper cable selection

www.king-electric.com 3

Rev 11.04.12

Model

SR123

SR243

SR125

SR245

SR128

SR248

SR1210

SR2410

Model

208 V

220 V

SR243

SR245

SR248

SR2410

Circuit Breaker Protection and Cable Length Design for Pipe Freeze Protection

Table 3: Maximum Single Cable Length

The maximum length of a single cable run is noted in Table 3
and cannot be exceeded. If the application requires a longer
cable run, then multiple cables and additional power circuits
must be used.

When using 240 volt SR cable on 208, 220 or 277 volt
applications, the power output (wattage) must be adjusted.
Refer to Table 4 for the adjusted watts/ft of the cable when
operated at a voltage other than 240 volt.

Circuit protection depends on the length of cable required
and the start-up temperature since the cable will draw more
power (wattage) when cold. Multiple cables can be run from
a single power circuit up to a maximum combined length as
noted in Table 5. Larger amperage circuits breakers can
handle longer combined cable lengths, but the maximum
length for a single cable run does not change. The NEC
requires the use of ground fault protection breakers for
heating cable.

NOTE: 240 volt cable lengths in Table 5 are also good for
208, 220, and 277 volt.

Volts Watt/ft

120V 3 w/ft 325 ft. (99M)
240V 3 w/ft 650 ft. (198M)
120V 5 w/ft 270 ft. (82M)
240V 5 w/ft 540 ft. (165M)
120V 8 w/ft 210 ft. (64M)
240V 8 w/ft 420 ft. (128M)

120V 10 w/ft 180 ft. (55M)
240V 10 w/ft 360 ft. (110M)

Table 4: Wattage Adjustment (W/Ft)

240V

3.0 2.5 2.7 3.4

5.0 4.3 4.6 5.5

8.0 7.0 7.44 8.6

10.0 9.0 9.4 10.5

Maximum

Single Run Length

277V

Table 5: Circuit Protection Per Combined Cable Length for Pipe Freeze Protection

Volts

120 V

Volts

240 V

Start up

Temp.

50ºF (10ºC)

0ºF

(-18ºC)

-20ºF

(-29ºC)

Start up

Temp.

50ºF (10ºC)

0ºF

(-18ºC)

-20ºF

(-29ºC)

Circuit

Breaker*

15 Amp 325 ft. (99M) 225 ft. (69M) 145 ft. (44M) 115 ft. (35M)
20 Amp 435 ft. (133M) 270 ft. (82M) 195 ft. (59M) 150 ft. (46M)
30 Amp 655 ft. (200M) 450 ft. (138M) 290 ft. (88M) 230 ft. (70M)
40 Amp 875 ft. (267M) 540 ft. (164M) 390 ft. (188M) 300 ft. (92M)
15 Amp 230 ft. (70M) 155 ft. (47M) 100 ft. (30M) 85 ft. (26M)
20 Amp 305 ft. (93M) 205 ft. (72M) 130 ft. (40M) 110 ft. (34M)
30 Amp 460 ft. (140M) 310 ft. (94M) 195 ft. (59M) 155 ft. (47M)
40 Amp 615 ft. (188M) 410 ft. (144M) 260 ft. (80M) 220 ft. (68M)
15 Amp 205 ft. (63M) 135 ft. (41M) 90 ft. (27M) 75 ft. (23M)
20 Amp 275 ft. (84M) 180 ft. (55M) 115 ft (35M) 100 ft. (30M)
30 Amp 415 ft. (127M) 270 ft. (82M) 175 ft. (53M) 145 ft. (44M)
40 Amp 555 ft. (169M) 360 ft. (110M) 230 ft. (70M) 200 ft. (60M)

Circuit

Breaker*

15 Amp 650 ft. (198M) 460 ft. (140M) 295 ft. (90M) 230 ft. (70M)
20 Amp 865 ft. (264M) 540 ft. (165M) 390 ft. (119M) 305 ft. (93M)
30 Amp 1300 ft. (396M) 920 ft. (280M) 590 ft. (180M) 460 ft. (140M)
40 Amp 1725 ft. (529M) 1080 ft. (330M) 780 ft. (238M) 610 ft. (186M)
15 Amp 460 ft. (140M) 310 ft. (94M) 200 ft. (61M) 165 ft. (50M)
20 Amp 615 ft. (188M) 415 ft. (127M) 265 ft. (81M) 220 ft. (67M)
30 Amp 925 ft. (282M) 620 ft. (189M) 395 ft. (120M) 325 ft. (99M)
40 Amp 1235 ft. (377M) 830 ft. (254M) 420 ft. (128M) 440 ft. (134M)
15 Amp 410 ft. (125M) 275 ft. (84M) 175 ft. (53M) 150 ft. (46M)
20 Amp 545 ft. (166M) 379 ft. (113M) 235 ft (72M) 195 ft. (59M)
30 Amp 820 ft. (250M) 540 ft. (165M) 350 ft. (107M) 290 ft. (83M)
40 Amp 1095 ft. (334M) 758 ft. (226M) 420 ft. (128M) 390 ft. (118M)

SR123

3w/ft.

SR243

3w/ft.

SR125

5w/ft.

SR245

5w/ft.

SR128
8w/ft.

SR248
8w/ft.

SR1210

10w/ft.

SR2410

10w/ft.

www.king-electric.com 4

Rev 11.04.12

SR Heating Cable Selection and
Design (continued)

CALCULATE THE TOTAL HEATING CABLE LENGTH
Cable length = A+B+C+D+E+F
A Pipe length x number of cables
B 4 ft. x number of valves
C 2 ft. x number of flanges, supports, etc.

D 1 ft. for each power connection

E 2 ft. for each splice connection
F 3 ft. for each tee connection
= Total heating cable length (ft)

MAXIMUM CIRCUIT LENGTH ALLOWED

Ensure that your circuits do not exceed the maximum
circuit length listed in Table 3, page 4. If necessary,
use additional shorter circuits.

EXAMPLE

Pipe size: 2” metal pipe
Lowest air temp: -20°F
Insulation thickness: 1”
Cable selection: (1) 5w/ft. (From table 1, pg 3)
Pipe length: 80 ft.
Valves: 2
Pipe supports: 12
Power connections: 1
Splice connections: 1

HEATING CABLE REQUIRED
A Pipe length x number of cables 80 ft. x 1 = 80 ft.
B 4 ft. x number of valves 4 ft. x 2 = 8 ft.
C 2 ft. x number of flanges, supports, etc. 2 ft. x 12 = 24 ft.

D 1 ft. for each power connection 1 ft. x 1 = 1 ft.

E 2 ft. for each splice connection. 1 ft. x 1 = 1 ft.
F 3 ft. for each tee connection 3 ft. x 0 = 0 ft.
= Total heating cable length (ft) 114 ft.

Heating Cable Installation

GENERAL NOTES

1. Verify that the heating cable is the correct length, wattage
and voltage prior to installation.

2. All welding, hydrostatic testing, and painting of the pipe
should be completed before the heating cable installation.

3. The piping system must be inspected to ensure that it is
clean, dry and has no sharp or jagged edges that could
potentially damage the heating cable.

4. Do not install the heat tracing before completion of the entire
piping system.

5. The cables must be installed a minimum of 10 inches away
from wood or any other combustible materials.

6. The minimum cable bending radius is 1/2 inch.

STEP 1: PREPARE FOR INSTALLATION

1. Store the heating cable in a clean, dry place.

2. Perform a pressure test on the pipe prior to cable installation.

3. Remove any sharp surfaces on the pipe that could potentially
damage the outer jacket of the heating cable.

4. Walk the pipe system and plan the routing of the heating
cable on the pipe.

STEP2: CUT THE HEATING CABLE TO LENGTH

1. Cut the heating cable to length required. This can be done

before or after the cable is attached to the pipe.

2. Leave a minimum of 1 foot extra heating cable for connection
to the supply power.

3. For splice and tee connections, leave a minimum of 1 foot for
each section of heating cable.

4. King SR heating cable can to length without affecting its heat
output per foot.

5. When splicing and terminating be sure to protect the cable
ends from moisture, contaminants and mechanical damage.

Single Cable

Double Cable

Figure 1: Cable Placement on Pipe

STEP 3: ATTACH THE CABLE TO THE PIPE

1. Verify pipe to be traced is completely dry.

2. For straight tracing, install the heating cable on a the lower
half of the pipe; for example, in the 4 o’clock or 8 o’clock

position as shown in Figure 1.

3. Install the extra heating cable as required for valves,
flanges, etc.

4. Spiral tracing is not recommended as it is labor intensive.

5. If applying spiral tracing, begin by suspending a loop
of cable every 10 feet as shown. To determine the loop
length, divide the length of pipe length and multiply by

10.

6. Fasten the heating cable to the pipe at 2 foot intervals

using SRK03 fiberglass tape or nylon cable ties. Do not
use vinyl electrical tape, duct tape, metal bands or wire.

7. If there is excess cable at the end of the pipe, double
remaining cable back along the pipe.

www.king-electric.com 5

Rev 11.04.12