4
Figure 5
– Roof Measurement
Step 2
. Use the estimated cable length calculated above to select the proper de-icing cable from Table 3. In general, choose the
longer cable if the length you need is between the sizes offered. If the difference is small (less than 5 feet or so), the shorter cable
can be used. You cannot change the cable length by cutting, splicing or altering it in any way.
If ice dams are occurring on roof areas that are significant distance apart, you may want to use a separate cable for each location,
rather than choosing one large cable. Also, if roof areas are large, separate cables for the roof area and gutter should be used.
Table 3 - Self-Regulating De-Icing Heating Cables
Cable #
Model No.
length(ft)
Volt(V)
Power Output(W)
On Pipe
@50°F / 10°C
On Pipe
@5°F / 40°C
In-Ice water
@32°F / 0°C
A
DR-9RC1006
6
120V
48
54
72
B
DR-9RC1012
12
120V
96
108
144
C
DR-9RC1018
18
120V
144
162
216
D
DR-9RC1024
24
120V
192
216
288
E
DR-9RC1050
50
120V
400
450
600
F
DR-9RC1075
75
120V
600
675
900
G
DR-9RC1100
100
120V
800
900
1200
H
DR-9RC1125
125
120V
1000
1125
1500
I
DR-9RC2200
200
240V
1600
1800
2400
J
DR-9RC2250
250
240V
2000
2250
3000
B.
For Problem in The Gutter Only
If ice dams are occurring in gutters only, measure the required
dimensions (see Figure 5) and calculate the length of the
cable needed for each area listed in Table 4. Add each
“area” calculation to determine the total cable length needed.
C.
For Roofs with Special Roof Area Applications
STEP 1
. For each area listed in Table 5, measure the required dimensions (see Figure 4 and Figure 6) and calculate the length of cable
needed. Add each “area” calculation to determine the total cable length needed.
STEP 2
. Use the estimated cable length calculated above to select the proper de-icing cable from Table 3. In general, choose the longer
cable if the length you need is between the sizes offered. If the difference is small (less than 5 feet or so), the shorter cable can be used.
You cannot change the cable length by cutting, splicing or altering it in any way.
If ice dams are occurring on roof areas that area significant distance apart, you may want to use a separate cable for each location, rather
than choosing one large cable. Also, if roof areas are large, separate cables for the roof area and gutter should be used.
