• The junction has four (4) ½” knockouts; two (2) on the bottom and
one on each side. Use a tool such as a flat screwdriver to remove
the knockouts. Remove only the required knockouts by hitting the
perimeter and not the center as shown in Figure 1.
• It is not recommended to run wires through the knockouts without
using a watertight strain relief or conduit.
• Use the appropriate ½” PG or NPT watertight cable strain relief
depending on your installation and the cable diameter. Table 2 shows
some of the ½” NPT options.
• Knockouts are designed to attach to any standard ½” rigid or flexible
conduit.
• Steel or nylon lock nuts can be used. Make sure lock nuts are properly tightened to avoid ingress of humidity or
water inside the junction box.
• Cables used to wire ES-C panels may be single or two conductors, from 14 AWG up to 10 AWG gauge.
• For cables exposed outdoors, use only sunlight resistant cables rated for 90ºC and wet locations. Table 1 shows
the outdoor sunlight resistant cable options.
• For cables installed in conduit, types THWN-2, RHW-2 and XHHW-2 are recommended.
Wire Type
Insulation (Jacket)
Characteristics
Watertight Strain Relief
USE-2
XLP/XLPE cross-linked
polyethylene
Underground
service entrance
1
/
2
” NPT with 1 or 2 round
holes. Steel or nylon lock nut.
TC (Tray)
Thermoplastic (PVC, Nylon).
XLP/XLPE for conductors.
2-conductor,
direct burial
1
/
2
” NPT with 1 oval hole.
Steel or nylon lock nut.
PV Wire
XLP/XLPE cross-linked
polyethylene
Thicker jacket per UL4703
Ungrounded arrays,
Transformerless inverters.
1
/
2
” NPT with 1 round hole.
Steel or nylon lock nut.
Table 1. Sunlight 90ºC Wet Resistant Cables.
Manufacturer
Part Number
(Black & Gray)
Opening
(Cable range)
Cable Type Fit
Hummel
CD16NS-01 &
CD16NS-02
One oval, 0.24” x 0.55”
TC (Tray) AWG #14/2,
12/2 &10/2
Hummel
CD13NR-BK &
CD13NR-GY
One round, 0.2” to 0.35”Ø
PV Wire AWG #14,12 &10
USE-2 AWG #14,12 & 10
Hummel
CD13N4-BK &
CD13N4-GY
Two round, 0.2” Ø
USE-2 AWG #14,12 & 10
Heyco
3231 & 3232
One round, 0.17” to
0.45ӯ
PV Wire AWG #14,12 &10
USE-2 AWG #14,12 & 10
Table 2. Watertight Strain Reliefs
• The panel contains factory installed bypass diodes located inside the junction box. These diodes are designed
to protect the panel against partial shading conditions and should not be removed.
• Diodes can be easy replaced in the field if necessary. Use only Super Barrier type diodes SBR10U45SD1, 45V,
10A or equivalent
.
Diodes should be installed as shown in Figure 2.
Copyright © 2009 Evergreen Solar, Inc.
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Figure 1. Knockout Removal
