J3 wiring chart – Hubbell Electric Heater Company J User Manual
Page 17
J3 Wiring Chart
kW
Volt
Ph
Unit
Amp
Draw
Phase-
Phase
Resistance
(Ohms)
Min.
Feed
Breaker
or Fuse
Size
Internal
Power
Wire
Size
Element
Jumper
Wire
Size
Copper
Power Feed
Wire Size
Conduit
Size
Diagram
2.9
120
1
23.8
5.0
30
12
12
10
½"
4
5.7
120
1
47.5
2.5
60
10
12
6
¾"
4
208
1
47.6
4.4
60
10
12
6
¾"
4
208
3
27.5
8.7
35
12
12
8
½"
10 (NT)
208
1
51.9
4.2
65
10
12
6
¾"
4
208
3
28.8
8.3
40
12
12
8
½"
10 (NT)
240
1
47.5
5.1
60
10
12
6
¾"
4
240
3
27.4
10.1
35
12
12
8
½"
10 (NT)
277
1
41.2
6.7
55
10
12
6
¾"
4 (WT)
380
3
16.8
25.3
25
12
12
12
½"
14
415
3
15.9
30.2
20
12
12
12
½"
14
480
3
13.7
40.4
20
12
12
14
½"
14
600
3
11.0
63.2
15
12
12
14
½"
14
9.9
10.4
11.4
J3 Wiring Chart Notes:
1. Power feed wire sizing is based on using 75°C Cu THHN wire with feeder branch
protection rated at 125%.
2. Internal wire sizing is based on using 200°C SEW-2 or PTFE wiring in a raceway
with an ambient temperature up to 60°C.
3. Normal phase-to-phase resistance tolerance is ±5%.
4. 277, 380,415, 480, and 600-volt phase-to-phase resistance values are shown with the
transformer disconnected.
J4 Wiring Chart
kW
Volt
Ph
Unit
Amp
Draw
Phase-
Phase
Resistance
(Ohms)
Min.
Feed
Breaker
or Fuse
Size
Internal
Power
Wire
Size
Element
Jumper
Wire
Size
Copper
Power Feed
Wire Size
Conduit
Size
Diagram
208
1
54.1
3.8
70
8
8
4
1"
4
208
3
31.2
7.7
40
8
8
8
½"
10 (NT)
220
1
57.3
3.8
75
8
8
4
1"
4
220
3
33.1
7.7
45
8
8
8
½"
10 (NT)
230
1
59.8
3.8
75
8
8
4
1"
4
230
3
34.5
7.7
45
8
8
8
½"
10 (NT)
240
1
62.5
3.8
80
8
8
4
1"
4
240
3
36.1
7.7
50
8
8
8
½"
10 (NT)
480
3
18.0
30.7
25
12
12
10
½"
10 (WT)
208
3
75.0
3.2
95
6
8
3
1"
10 (NT)
240
3
65.0
4.3
85
8
10
4
1"
10 (NT)
480
3
32.5
17.1
45
12
12
8
½"
10 (WT)
13.8
11.3
12.6
15
27
J4 Wiring Chart Notes:
1. Power feed wire sizing is based on using 75°C Cu THHN wire with feeder branch
protection rated at 125%.
2. Internal wire sizing is based on using 200°C SEW-2 or PTFE wiring in a raceway
with an ambient temperature up to 60°C.
3. Normal phase-to-phase resistance tolerance is ±5%.
4. 480-volt phase-to-phase resistance values are shown with the transformer disconnected.