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SLHCBL
Maximum Circuit Length in Feet Vs. Circuit Breaker Size
Start-up Temperature
Circuit
Heat Cable
Breaker
50°F
32°F
-4°F
Type
Size
(10°C)
(0°C)
(-20°C)
10 amp
120
110
105
15 amp
180
175
158
SLHCBL5120
20 amp
240
215
190
30 amp
259
245
240
40 amp
266
255
250
10 amp
240
220
210
15 amp
360
350
315
SLHCBL5240
20 amp
479
430
380
30 amp
518
490
480
40 amp
531
510
500
10 amp
73
69
65
15 amp
118
110
98
SLHCBL10120
20 amp
148
140
130
30 amp
220
200
182
40 amp
255
240
220
10 amp
146
138
130
15 amp
236
220
195
SLHCBL10240
20 amp
295
280
260
30 amp
440
400
364
40 amp
510
480
440
10 amp
50
47
42
15 amp
75
65
63
SLHCBL15120
20 amp
100
90
83
30 amp
143
135
125
40 amp
190
175
168
10 amp
100
93
83
15 amp
150
130
125
SLHCBL15240
20 amp
200
180
165
30 amp
285
270
250
40 amp
380
350
335
10 amp
39
33
34
15 amp
58
55
50
SLHCBL20120
20 amp
75
71
68
30 amp
115
105
100
40 amp
153
143
133
10 amp
77
70
67
15 amp
115
110
100
SLHCBL20240
20 amp
150
142
135
30 amp
230
210
200
40 amp
306
286
265
®
© BriskHeat
Self Regulating Heating Cable
Heat Output (Watts per Foot)
21
D = 20 W/FT
D
-40°F
C = 15 W/FT
18
(-40°C)
B = 10 W/FT
A = 5 W/FT
90
15
C
143
180
12
225
B
9
240
180
6
285
A
360
3
450
0
480
32(0)
68(20)
104(40)
140(60)
176(80)
212(100) 248(120)
58
Pipe Temperature, °F(°C)
88
118
Voltage Adjustment Factors
175
Watt/ft Output Adjustment Factor
230
Product Type
208 VAC
116
SLHCBL5240
0.87
175
SLHCBL10240
0.88
235
SLHCBL15240
0.88
350
SLHCBL20240
0.86
460
40
Max Circuit Length Adjustment Factor
60
80
Product Type
208 VAC
120
SLHCBL5240
0.99
160
SLHCBL10240
0.99
80
SLHCBL15240
0.98
120
SLHCBL20240
1.00
160
240
320
32
48
63
95
125
63
95
125
190
250
Figure 17
Corporation. All rights reserved.
23
Ground Fault Protection
Ground fault circuit breakers are required on all heater constructions per the National Electric Code. Typically, 30ma trip devices are
required due to the capacitive leakage of the heating cable construction.
Waterproofing
Moisture penetration of the electrical system is the single largest source of problems in a heating cable system installation. Therefore,
particular care must be given to the proper sealing of all electrical connections and splices. Heating cable sealing kits will provide a
proper seal for the heating cable itself, when used per kit instructions. All other electrical connections (heater to power wiring,
thermostat connections, panel and breaker connections, etc.) should be sealed or moisture proofed in some fashion. Either mastic
shrink tube or an aerosol electrical insulative sealant should be used on all connections to reduce any moisture penetration. The
sealant will also reduce the potential for corrosion on exposed metal parts.
TESTING
Recommendations
Electrical tests are recommended at specific points in the receipt and installation of the heating cable. This periodical testing is
designed to prevent the expenditure of wasted labor in the event of damage to the product. Installation costs of the cable and thermal
insulation are much greater that the heating cable. Quick identification of any heating cable damage is the most economic approach to
an installation. An insulation resistance test is recommended at the following point of the installation process:
UPON RECEIPT of the heating cable
277 VAC
BEFORE thermal INSULATION installation
1.07
IMMEDIATELY AFTER thermal insulation installation
1.08
1.08
As part of a PERIODIC MAINTENANCE program
1.07
Procedure
The insulation resistance test is used to check for damage to extruded jackets. Connections for the megger are made as shown in
277 VAC
Figures 18 & 19.
1.08
1.06
1.06
1.08
500 VDC
MEGGER
Note: Test should use at least a 500 VDC megger. Do not use a megger with an excess of 2500 VDC. Minimum acceptable readings
should be 20 megohms per circuit, regardless of length.
FOR HEATING CABLES WITH BRAID
Test from heating cable bus to braid
Figure 18
®
© BriskHeat
Corporation. All rights reserved.
24
Self Regulating Heating Cable
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