Install Instructions

7
STEP 1.4 (ProMelt Cable Only)
Select the cables you need.
WATTAGE: Decide what heat output is required. Your design must consider weather conditions and how critical it is
to clear the heated area.
50 watts per square foot: sufficient to clear most moderate and heavy snowfall rates
38 watts per square foot: sufficient to clear most light to moderate snowfall rates
SIZE: Select a cable in Table 2 to fit the Heated Area measured in Step 1.2. ProMelt Cable is manufactured in a variety
of sizes as shown. If the exact size of cable is not found in the Table, select the next smaller cable size.
AMPS and VOLTS: Pay careful attention to the amps to make sure your controls, circuit breaker panel, and all wiring
will have the proper capacity. Design circuit protection and wiring to handle 125 percent of heating cable load:
-20 amp circuit for load up to 16 amps
-30 amp circuit for load up to 24 amps
-40 amp circuit for load up to 32 amps
-50 amp circuit for load up to 40 amps
-70 amp circuit for load up to 50 amps
277V
Model
50 W/sqft
3” Spacing
(Sq Feet)
38 W/sqft
4” Spacing
(Sq Feet)
Cable
Length
(Feet)
Amp
Draw Ohms
SC50277018 18 24 71 3.2 77 - 95
SC50277030 30 29 118 5.4 55 - 68
SC50277035 35 46 138 6.3 36 - 45
SC50277045 45 59 178 8.1 29 - 37
SC50277055 55 72 218 9.9 24 - 31
SC50277060 60 79 238 10.8 19 - 25
SC50277070 70 92 277 12.6 17 - 21
SC50277075 75 98 297 13.5 14 - 18
SC50277080 80 105 317 14.4 12 - 16
SC50277090 90 118 357 16.2 11 - 15
SC50277105 105 137 417 19.0 11 - 14
SC50277115 115 150 456 20.8 9 - 12
240V
Model
50 W/sqft
3” Spacing
(Sq Feet)
38 W/sqft
4” Spacing
(Sq Feet)
Cable
Length
(Feet)
Amp
Draw Ohms
SC50240015 15 20 59 3.1 64 - 79
SC50240025 25 33 98 5.2 46 - 57
SC50240030 30 39 118 6.3 30 - 38
SC50240040 40 53 158 8.3 26 - 33
SC50240045 45 59 178 9.4 20 - 25
SC50240055 55 72 218 11.5 18 - 23
SC50240060 60 79 238 12.5 14 - 18
SC50240065 65 85 257 13.5 12 - 16
SC50240075 75 98 297 15.6 11 - 15
SC50240080 80 105 317 16.7 10 - 13
SC50240090 90 118 357 18.8 9 - 12
SC50240105 105 137 417 21.9 8 - 11
120V
Model
50 W/sqft
3” Spacing
(Sq Feet)
38 W/sqft
4” Spacing
(Sq Feet)
Cable
Length
(Feet)
Amp
Draw Ohms
SC50120008 8 10 29 3.3 31 - 38
SC50120015 15 20 59 6.3 15 - 19
SC50120020 20 26 78 8.3 13 - 17
SC50120040 40 53 158 16.7 5 - 7
SC50120053 53 69 208 22.1 4 - 6
Table 2 (cable sizes)
208V
Model
50 W/sqft
3” Spacing
(Sq Feet)
38 W/sqft
4” Spacing
(Sq Feet)
Cable
Length
(Feet)
Amp
Draw Ohms
SC50208014 14 19 55 3.4 60 - 74
SC50208020 20 26 78 4.8 36 - 46
SC50208030 30 39 118 7.2 30 - 38
SC50208035 35 46 138 8.4 23 - 29
SC50208040 40 53 158 9.6 18 - 23
SC50208045 45 59 178 10.8 14 - 19
SC50208055 55 72 218 13.2 13 - 17
SC50208060 60 79 238 14.4 11 - 15
SC50208065 65 85 257 15.6 10 - 13
SC50208075 75 98 297 18.0 9 - 12
SC50208080 80 105 317 19.2 8 - 11
SC50208090 90 118 357 21.6 7 - 9