135702 Catalog

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J-1

Conduit Outlet Boxes and Bodies:
Explosionproof, Dust-Ignitionproof

GRSS

Effective September, 2005
Copyright 2005

Description

2,3

Features: All Conduit Outlet Boxes
and Bodies

4,5

GR Boxes

5

Dimensions

8

Covers

6

GRF Boxes

6

Dimensions

8

Covers

7

GRH Boxes

7

Dimensions

9

ELBY and ELBD Pulling Elbows

9

Elbow Type/Dimensions

10

GRSS Conduit Outlet Boxes

10

Box Type/Dimensions

11

CPU Boxes

11

Covers/Dimensions

12

GRU and GRUE Boxes

12

Dimensions

8

Covers GRU

17

Covers GRUE

13

GRJS Boxes

13

Covers/Dimensions

14

GRJ Boxes

14

Box Type/Dimensions

15

ER Boxes

15

Hub Type/Dimensions

16

GRUO and GRUJ Boxes

16

Covers/Dimensions

17

GRU Union-Hub Boxes

17

Covers/Dimensions

18

GU Boxes

18

Hub Type/Dimensions

19

Wiring Capacity

J

GU

Page

800-621-1506
www.appletonelec.com
PAGE 1

J-2

Conduit Outlet Boxes and Bodies:
Malleable Iron or Aluminum;
Explosionproof, Dust-Ignitionproof
UNILETS® for use with Threaded Metal Conduit.

Applications
Meet a wide range of classified area
requirements.
Corrosion-resistant–ideal indoors or
out.
For pulling of wires.
Connect conduit lengths and change
direction of conduit.
Provide access for maintenance.

•
•
•
•
•

Features: All Bodies and Boxes
Malleable iron bodies have high
tensile strength and ductility. Provides
great resistance to corrosion, impact,
and shock.
Accurately tapped, tapered hub
threads for tight, rigid joints and ground
continuity.
Furnished with covers.
General purpose wiring.

•
•
•
•

Features: GR and GRF

➊GR offers ten hub arrangements.
➋GRF has integral mounting flange.

• Function
J

as sealing fittings when
used with sealing covers (see NEC for
restrictions).
Inter nally threaded body with
externally threaded cover.
Covers have pry notches for bar or
wrench.
Accommodate sealing, dome, hub
and union hub covers, and canopies.
Standard O-rings provide raintight fit.
NEMA 3,4.
Internal ground screw standard.
Smooth, rounded integral bushing in
each hub type box protects conductor
insulation.

•
•
•
•
•
•

Features: GRH

➌Designed for use in Class I, Groups

A, B, C, and D; Class II, Groups E, F,
and G; and Class III.
Inter nally threaded body with
externally threaded covers.
Standard O-rings provide raintight fit.
NEMA 3,4.
Internal ground screw standard.
Smooth, rounded integral bushing in
each hub type box protects conductor
insulation.

•
•
•
•

14 GU

Features: ELBD

➍Exclusive built-in pulling rollers in

each end (2-1/2 thru 4” sizes) protect
cable from damage and make cable
pulling easier.

Effective September, 2005
Copyright 2005
PAGE 2

13 GRSS

800-621-1506
www.appletonelec.com

Conduit Outlet Boxes and Bodies:
Malleable Iron or Aluminum;
Explosionproof, Dust-Ignitionproof

J-3

UNILETS® for use with Threaded Metal Conduit.

• Excellent for use in wiring of motors,
panelboards, circuit breakers, entrances to buildings, etc.
Body and cover have ground mating
surfaces to meet classified-location
requirements.
Smooth, rounded integral bushing in
each hub type box protects conductor
insulation.

•
•

Features: ELBY
Serve as pulling fittings.
Make 90° bends in conduit.
Threaded cover opening permits
easy access for pulling conductors thru
hubs.
Easily removable threaded cover.

•
•
•
•

Features: CPU
Universal design with four threaded
universal hubs and three close-up
plugs.
Serve as mounting outlets for lighting
fixtures when used with hub cover.
Wide, accurately ground explosionproof mating surfaces.
Smooth, rounded integral bushing in
each hub type box protects conductor
insulation.

•
•
•

•
•
•
•
•

Features: GRJS
Universal design with five threaded
openings and three close-up plugs.
Compact round box for use where
space is limited.
Serve as mounting means for lighting
fixtures when used with hub cover.
Function as sealing fittings when

•
•
•

Effective September, 2005
Copyright 2005

•
•

Features: GRJ
Small, round conduit outlet boxes.

•

Function as sealing fittings when
used with sealing covers (see NEC for
restrictions).
Externally threaded body with internally threaded cover.
Smooth, rounded integral bushing in
each hub type box protects conductor
insulation.

•
•

Features: ER
Compact, rectangular conduit outlet
boxes are ideal in classified locations
where space is limited.
Six different hub arrangements.
Ground surface contact between
body and cover assures a flame-tight
joint.
Smooth, rounded integral bushing in
each hub type box protects conductor
insulation.

•
•
•

Features: GRUO and GRUJ
Threaded universal hubs for wiring
flexibility.
GRUO has eight hubs.
GRUJ offers up to eleven hubs.

•

• Ideally suited for use where space is
limited, such as for gasoline pumps.
Function as sealing fittings when
•used
with sealing cover (see NEC for
restrictions).
Externally threaded body with internally threaded covers.
Smooth, rounded integral bushing in
each hub type box protects conductor
insulation.

Features: GRSS and GRSSA
Multiple hubs permit flexibility.
Copper-free aluminum body and
cover provide superior corrosion
resistance.
Internal ground screw standard.

•
•

13

•

Features: GU
Designed for Class I, Groups B,C,D;
Class II, Groups E,F,G; and Class III.
Exter nally threaded body with
internally threaded cover.
Smooth, rounded integral bushing in
each hub type box protects conductor
insulation.
Internal ground screw standard.

•
•
•

14

•

Standard Materials
G R F, G R H , a n d G R J S :
Malleable iron bodies with aluminum
covers.
Aluminum GR Series: Copper-free
body and cover.
GU, GRUO, GRUJ, GRU (Union),
GRJ, CPU, ER, ELBD and ELBY:
Malleable iron bodies and covers.
GRU, GRUE, and GRSS: Aluminum
copper-free bodies and covers.
GRG O-Rings: Neoprene.

• GR,
•
•
•
•

Standard Finishes
Malleable iron bodies and
covers (except ELBY) triple-coat—(1)
zinc electroplate, (2) dichromate, and
(3) epoxy powder coat.
Aluminum bodies and covers: epoxy
powder coat.
ELBY malleable iron body and cover:
zinc electroplate and clear chromate.

•
•
•

Compliances
UL Standard 886.
Federal Spec. W-C-586B.
Appleton malleable iron products
conform to ASTM A47-77, Grade
32510, which has the following properties: tensile strength, 50,000 psi; yield,
32,000 psi; and elongation, 10%.
Appleton aluminum products are
produced from a high strength copperfree (4/10 of 1% max.) alloy.
Suitable for Class I, Div. 1 & 2, if
installed in compliance with NEC 5014(a)(b) and for Class II, Div. 1 & 2, if
in compliance with NEC 502-4(a)(b).
GR Series: CSA -LR25875-30.

•
•

•
•
•

Features: GRU (Union Hubs)
Union hubs permit easy wiring.

•

• Function

as sealing fittings when
used with sealing covers (see NEC for
restrictions).
Externally threaded body with internally threaded cover.
Smooth, rounded integral bushing in
each hub type box protects conductor
insulation.

•
•

•
•

800-621-1506
www.appletonelec.com
PAGE 3

J

Features: GRU and GRUE
Universal design with five threaded
universal hubs and three close-up
plugs.
Copper-free aluminum body and
cover provide resistance to corrosive
atmospheres.
Function as sealing fittings when
used with sealing covers (see NEC for
restrictions).
GRU has internally threaded body
and externally threaded cover with Oring for raintight fit, NEMA 3,4. GRUE
has externally threaded body and
internally threaded overlapping cover.
Covers have pry notches for bar or
wrench.
Smooth, rounded integral bushing in
each hub type box protects conductor
insulation.

used with sealing covers (see NEC for
restrictions).
Inter nally threaded body with
externally threaded cover.
Smooth, rounded integral bushing in
each hub type box protects conductor
insulation.

J-4

Class I, Div. 1 and 2
Groups B*,C,D
Class II, Div. 1 and 2
Groups E,F,G
Class III
NEMA 3,4

GR Conduit Outlet Boxes:
Explosionproof, Dust-Ignitionproof
UNILETS® for use with Threaded Metal Conduit.
Furnished with Internal Ground Screw and O-Ring.

Hub
Type

GRE

GRC

GRL

GRLB

J
GRN

GRT

GRX

Conduit
Size
(Inches)

Cover
Opening
(Inches)

Cubic
Inches

Form
No.†

Catalog Number*
Malleable Iron•
Aluminum•

1/2
3/4
1
1-1/4
1-1/2

3.38
3.38
3.38
3.94
4.88

18
18
18
31
72

1
1
1
2
3

GRE50
GRE75
GRE100
GRE125
GRE150

GRE50-A
GRE75-A
GRE100-A
GRE125-A
GRE150-A

1/2
3/4
1
1-1/4
1-1/2
2

3.38
3.38
3.38
3.94
4.88
4.88

18
18
18
31
72
76

1
1
1
2
3
3

GRC50
GRC75
GRC100
GRC125
GRC150
GRC200

GRC50-A
GRC75-A
GRC100-A
GRC125-A
GRC150-A
GRC200-A

1/2
3/4
1
1-1/4
1-1/2
2

3.38
3.38
3.38
3.94
4.88
4.88

18
18
18
31
72
76

1
1
1
2
3
3

GRL50
GRL75
GRL100
GRL125
GRL150
GRL200

GRL50-A
GRL75-A
GRL100-A
GRL125-A
GRL150-A
GRL200-A

1/2
3/4
1
1-1/4
1-1/2
2

3.38
3.38
3.38
3.94
4.88
4.88

18
18
18
31
72
76

1
1
1
2
3
3

GRLB50
GRLB75
GRLB100
GRLB125
GRLB150
GRLB200

GRLB50-A
GRLB75-A
GRLB100-A
GRLB125-A
GRLB150-A
GRLB200-A

1/2
3/4
1
1-1/4
1-1/2

3.38
3.38
3.38
3.94
4.88

18
18
18
31
72

1
1
1
2
3

GRN50
GRN75
GRN100
GRN125
GRN150

GRN50-A
GRN75-A
GRN100-A
GRN125-A
GRN150-A

1/2
3/4
1
1-1/4
1-1/2
2

3.38
3.38
3.38
3.94
4.88
4.88

18
18
18
31
72
76

1
1
1
2
3
3

GRT50
GRT75
GRT100
GRT125
GRT150
GRT200

GRT50-A
GRT75-A
GRT100-A
GRT125-A
GRT150-A
GRT200-A

1/2
3/4
1
1-1/4
1-1/2
2

3.38
3.38
3.38
3.94
4.88
4.88

18
18
18
31
72
76

1
1
1
2
3
3

GRX50
GRX75
GRX100
GRX125
GRX150
GRX200

GRX50-A
GRX75-A
GRX100-A
GRX125-A
GRX150-A
GRX200-A

* In Class I, Div. 1, Group B atmospheres, all conduit runs must have a sealing fitting (not supplied) field installed adjacent to the enclosure.
• Supplied with Aluminum covers.
† Form number designates body and matching cover sizes. To order body without cover, add suffix -LC to catalog number.
Other covers available—see GR Cover listing page and order separately.
See J-8 for optional Terminal Blocks.
Effective August, 2008
Copyright 2008
PAGE 4

800-621-1506
www.appletonelec.com

Class I, Div. 1 and 2
Groups B*,C,D
Class II, Div. 1 and 2
Groups E,F,G
Class III
NEMA 3,4

J-5

GR Conduit Outlet Boxes:
Explosionproof, Dust-Ignitionproof
UNILETS® for use with Threaded Metal Conduit.
Furnished with Internal Ground Screw and O-Ring.

Conduit
Size
(Inches)

Cover
Opening
(Inches)

Form
No.†

Catalog Number*
Malleable Iron
Aluminum

GRCA

1/2
3/4

3.38
3.38

1
1

GRCA50
GRCA75

GRCA50-A
GRCA75-A

GRLA

1/2
3/4

3.38
3.38

1
1

GRLA50
GRLA75

GRLA50-A
GRLA75-A

GRTA

1/2
3/4

3.38
3.38

1
1

GRTA50
GRTA75

GRTA50-A
GRTA75-A

Hub
Type

* In Class I, Div. 1, Group B atmospheres, all conduit runs must have a sealing fitting (not supplied) field installed adjacent to the enclosure.
• Supplied with Aluminum covers.
† Form number designates body and matching cover sizes. To order body without cover, add suffix -LC to catalog number.
Other covers available—see GR Cover listing page and order separately.
See J-8 for optional Terminal Blocks.

GR Series, Form 1
Dimensions in Inches
Hub Size (In.)

B

C

D

E

F

G

3.75
3.75
3.75

2.44
2.44
2.44

2.88
2.88
2.88

.75
.75
.94

.81
.81
.94

2.25
2.25
2.25

1.25
1.25
1.06

6.2
6.2
6.2

7.3
7.3
7.3

1.9
1.9
2.4

2.1
2.1
2.4

5.7
5.7
5.7

3.2
3.2
2.7

A

B

C

D

E

F

G

4.50
5.75
5.75

2.69
3.75
4.00

3.56
4.81
5.06

1.19
1.38
1.63

.88
.94
1.00

2.75
4.06
4.25

1.13
1.50
1.25

6.8
9.5
10.2

9.1
12.2
12.9

3.0
3.5
4.1

2.2
2.4
2.5

7.0
10.3
10.8

2.9
3.8
3.2

Dimensions in Centimeters
1/2
3/4
1

9.5
9.5
9.5

GR Series, Forms 2 and 3
Dimensions in Inches
Hub Size (In.)
1-1/4
1-1/2
2

Dimensions in Centimeters
1-1/4
1-1/2
2

11.4
14.6
14.6

For cubic inches information, see page J-19
Effective August, 2008
Copyright 2008

800-621-1506
www.appletonelec.com
PAGE 5

J

1/2
3/4
1

A

J-6

Class I, Div. 1 and 2
Groups B*,C,D
Class II, Div. 1 and 2
Groups E,F,G
Class III
NEMA 3,4

GRF Flanged Conduit Outlet Boxes:
Explosionproof, Dust-Ignitionproof
UNILETS® for use with Threaded Metal Conduit.
Furnished with Internal Ground Screw and O-Ring.

Conduit
Size
(Inches)

Cover
Opening
(Inches)

Form
No.†

Catalog Number*
Malleable Iron
Aluminum

GRFC

1/2
3/4
1

3.38
3.38
3.38

1
1
1

GRFC50
GRFC75
GRFC100

GRFC50-A
GRFC75-A
GRFC100-A

GRFL

1/2
3/4
1

3.38
3.38
3.38

1
1
1

GRFL50
GRFL75
GRFL100

GRFL50-A
GRFL75-A
GRFL100-A

GRFT

1/2
3/4
1

3.38
3.38
3.38

1
1
1

GRFT50
GRFT75
GRFT100

GRFT50-A
GRFT75-A
GRFT100-A

GRFX

1/2
3/4
1

3.38
3.38
3.38

1
1
1

GRFX50
GRFX75
GRFX100

GRFX50-A
GRFX75-A
GRFX100-A

Hub
Type

* In Class I, Div. 1, Group B atmospheres, all conduit runs must have a sealing fitting (not supplied) field installed adjacent to the enclosure.
† Form number designates body and matching cover sizes. To order body without cover, add suffix -LC to catalog number.
Other covers available—see GR Cover listing page and order separately.
For cubic inches information, see page J-19

J
Effective August, 2008
Copyright 2008
PAGE 6

800-621-1506
www.appletonelec.com

Class I, Div. 1 and 2
Groups A,B,C,D
Class II, Div. 1 and 2
Groups E,F,G
Class III
NEMA 3,4

J-7

GRH Conduit Outlet Boxes:
Explosionproof, Dust-Ignitionproof
UNILETS® for use with Threaded Metal Conduit.
Furnished with Internal Ground Screw and O-Ring.

Hub
Type

Conduit
Size (Inches)

Cover
Opening (Inches)

Catalog Number
Malleable Iron

GRHC

1/2
3/4
1

3.38
3.38
3.38

GRHC50
GRHC75
GRHC100

GRHL

1/2
3/4
1

3.38
3.38
3.38

GRHL50
GRHL75
GRHL100

GRHLB

1/2
3/4
1

3.38
3.38
3.38

GRHLB50
GRHLB75
GRHLB100

GRHT

1/2
3/4
1

3.38
3.38
3.38

GRHT50
GRHT75
GRHT100

GRHX

1/2
3/4
1

3.38
3.38
3.38

GRHX50
GRHX75
GRHX100

J

GRH Series
Dimensions in Inches
Hub Size (In.)
1/2
3/4
1

A

B

C

D

E

F

G

3.75
3.75
3.75

2.44
2.44
2.44

2.63
2.63
2.63

.75
.75
.94

.81
.81
.94

1.63
1.63
1.63

1.25
1.25
1.06

6.2
6.2
6.2

6.7
6.7
6.7

1.9
1.9
2.4

2.1
2.1
2.4

4.1
4.1
4.1

3.2
3.2
2.7

Dimensions in Centimeters
1/2
3/4
1

9.5
9.5
9.5

For cubic inches information, see page J-19

Effective September, 2005
Copyright 2005

800-621-1506
www.appletonelec.com
PAGE 7

J-8

Covers for GR and GRF Conduit Outlet Boxes
Covers and O-rings Fit Bodies with Corresponding
Form Numbers.

Hub
Type

Cover
Opening
(Inches)

Fixture
Stem Size
(Inches)

Form
No.†

Catalog Number
Malleable Iron
Aluminum

J

Surface

3.38
3.94
4.88

1
2
3

GRK-1M
GRK-2M
GRK-3M

GRK-1
GRK-2
GRK-3

Sealing

3.38
3.94
4.88

1
2
3

GRK-1SC
GRK-2SC
GRK-3SC

GRK-1SC-A
GRK-2SC-A
GRK-3SC-A

Dome
2” deep

3.38

1

Union Hub

3.38

3/4

1

GRK-75U

GRK-75UA

Hub

3.38
3.38

1/2
3/4

1
1

GRK-50
GRK-75

GRK50-A
GRK75-A

Canopy
Length
4-1/2”

3.38
3.38
3.38

1/2
3/4
1

1
1
1

GRK-50C
GRK-75C
GRK-100C

O-Rings—Buna-N
Provide Raintight fit when used on
following series: GR (Forms 1, 2 and 3),
GRF (Form 1), GRH, and GRU (Form 1).

1
2
3

GRK-1DC

Catalog Number
GRG-1
GRG-2
GRG-3

GRTB Terminal Strip
For use in standard GR series boxes Weidmuller type MK terminal Block*
with wire range of #22-#12 AWG. Mounts on 2 predrilled and tapped standard
holes (furnished in internal GR boxes).
6 position terminal block kit
6 position terminal block kit
12 position terminal block kit

1+2
3
3

GRTB6-12
GRTB6-3
GRTB12-3

*Terminal block is UL listed for 300 volts, 25 ampere. CSA certified for 300 volts, 13 ampere.
†Form numbers designate cover and matching body sizes.

Effective September, 2005
Copyright 2005
PAGE 8

800-621-1506
www.appletonelec.com

ELBY Series:
Class I, Div. 1 and 2
Groups B◆,C,D
Class II, Div. 1 and 2
Groups E,F,G
Class III
ELBD Series:
Class I, Div. 1 and 2
Group D
Class II, Div. 1 and 2
Groups E,F,G
Class III

J-9

ELBY and ELBD 90° Pulling Elbows:
Explosionproof, Dust-Ignitionproof
UNILETS® for use with Threaded Metal Conduit.

Catalog Number
Malleable Iron
Aluminum

Type and Size (Inches)

ELBY Capped Elbow
1/2
3/4
1
1-1/4

ELBY-50
ELBY-75
ELBY-100
ELBY-125

ELBY-50-A
ELBY-75-A
ELBY-100-A
ELBY-125-A

ELBD-50
ELBD-75
ELBD-100
ELBD-125
ELBD-150
ELBD-200

ELBD-50-A
ELBD-75-A
ELBD-100-A
ELBD-125-A
ELBD-150-A
ELBD-200-A

ELBD-250
ELBD-300
ELBD-350
ELBD-400

ELBD-250-A
ELBD-300-A
ELBD-350-A
ELBD-400-A

ELBD Pulling Elbow
1/2
3/4
1
1-1/4
1-1/2
2
2-1/2
3
3-1/2
4

Patented Roller Feature—
Listings in Italic Type

ELBY Series
Dimensions in Inches

1/2
3/4
1
1-1/4
1-1/2
2
2-1/2
3
3-1/2
4

J

Hub Size
(Inches)

ELBD Series
Dimensions in Inches

A

B

C

D

A

B

C

D

E

F

2.75
2.88
3.19
4.00

1.44
1.44
1.88
2.31

2.06
2.06
2.56
3.13

1.44
1.44
1.75
2.13

5.06
5.06
7.88
7.88
10.63
10.63
14.69
14.69
28.25
28.25

2.63
2.63
3.44
3.44
4.81
4.81
6.63
6.63
7.50
7.50

4.50
4.50
5.00
5.00
6.75
6.75
9.25
9.25
12.75
12.75

1.06
1.06
1.75
1.75
2.56
2.56
3.75
3.75
4.63
4.63

4.69
4.69
7.50
7.50
10.69
10.69
13.81
13.81
27.56
27.56

2.69
2.69
3.94
3.94
4.94
4.94
6.69
6.69
7.38
7.38

11.9
11.9
19.1
19.1
27.2
27.2
35.1
35.1
70.0
70.0

6.8
6.8
10.0
10.0
12.5
12.5
17.0
17.0
18.7
18.7

Dimensions in Centimeters
1/2
3/4
1
1-1/4
1-1/2
2
2-1/2
3
3-1/2
4

7.0
7.3
8.1
10.2

3.7
3.7
4.8
5.9

5.2
5.2
6.5
7.9

Dimensions in Centimeters
3.7
3.7
4.5
5.4

12.9
12.9
20.0
20.0
27.0
27.0
37.3
37.3
71.4
71.4

6.7
6.7
8.7
8.7
12.2
12.2
16.8
16.8
19.1
19.1

11.4
11.4
12.7
12.7
17.2
17.2
23.5
23.5
32.4
32.4

2.7
2.7
4.5
4.5
6.5
6.5
9.5
9.5
11.8
11.8

For cubic inches information, see page J-19
◆Shaded

area indicates items suitable for Class I, Group B, in addition to Class I, Groups C, D; Class II, Groups E, F, G; and Class III.

Effective September, 2005
Copyright 2005

800-621-1506
www.appletonelec.com
PAGE 9

J-10

Class I, Div. 1 and 2
Groups B*,C,D
Class II, Div. 1 and 2
Groups E,F,G
Class III

GRSS Conduit Outlet Boxes with Multiple Hubs:
Explosionproof, Dust-Ignitionproof
UNILETS® for use with Threaded Metal Conduit.
Furnished with internal ground screw and O ring gasket.

Box
Type

Conduit
Size (In.)

Cover Opening
(Inches)

Hubs

Plugs

Cubic
Inches

Catalog Number*
Aluminum

GRSS Outlet Box with Cover
Internally threaded aluminum bodies with externally threaded aluminum form 1 covers.
Has 7 hubs; 2 on each of the sides, 1 on the top, 1 on the bottom and 1 on the center
in the back. Furnished with 4 close-up plugs and O-Ring.
GRSS

1/2
3/4
1

3.38
3.38
3.38

7
7
7

4
4
4

29.0
29.0
29.0

GRSS50
GRSS75
GRSS100

GRSSA Outlet Box with Cover
Internally threaded aluminum bodies with externally threaded aluminum form 1 covers.
Has 13 hubs; 2 on each side, 2 each on top and bottom and 5 in the back.
Furnished with 5 close-up plugs and O-Ring.
GRSSA

1/2
3/4

3.38
3.38

13
13

5
5

29.0
29.0

GRSSA50
GRSSA75

Dimensions

J
For larger size boxes, refer to Catalog Section K.
For cubic inches information, see page J-19
* In Group “B” atmospheres, all conduit runs must have a sealing fitting (not supplied) field installed adjacent to the enclosure.
Effective September, 2005
Copyright 2005
PAGE 10

800-621-1506
www.appletonelec.com

Class I, Div. 1 and 2
Groups C,D
Class II, Div. 1 and 2
Groups E,F,G
Class III

J-11

CPU Universal Conduit Outlet Boxes and Covers:
Explosionproof, Dust-Ignitionproof
UNILETS® for use with Threaded Metal Conduit.

Box
Type

Conduit
Size (Inches)

Fixture
Stem
Size (Inches)

Cover
Opening
(Inches)

Catalog Number
Malleable Iron

3.81

CPU20

3.81
3.81

CPU20-50
CPU20-75

CPU Box with Blank Cover
(Form 20)
Furnished with four threaded
universal 3/4” hubs, four 3/4” to 1/2”
reducers, and three 1/2” close-up plugs.
1/2 or 3/4

CPU Box with Hub Cover
(Form 20)
Furnished with four threaded
universal 3/4” hubs, four 3/4” to 1/2”
reducers, and three 1/2” close-up plugs.
1/2 or 3/4
1/2 or 3/4

1/2
3/4

CPU Covers only
(Form 20)
Furnished with fastening screws.
Blank

3.81

CPSK20B

Hub Covers

1/2
3/4

3.81
3.81

CPSK20-50
CPSK20-75

J

1.312” / 3.33 cm

Cover

CPU Connection Block
Phenolic. With fastening strap and two mounting screws.
➤

➤

2.875” / 7.06 cm

5-Wire, 20-Ampere, 300 Volt

CB205

0.219” / 0.56 cm

CPU Dimensions

Effective September, 2005
Copyright 2005

For cubic inches information, see page J-19

800-621-1506
www.appletonelec.com
PAGE 11

J-12

Class I, Div. 1 and 2
Groups C,D
Class II, Div. 1 and 2
Groups E,F,G
Class III

GRU and GRUE Universal Conduit Outlet Boxes:
Explosionproof, Dust-Ignitionproof
UNILETS® for use with Threaded Metal Conduit. Furnished
with Internal Ground Screw. GRU furnished with O-Ring.

Conduit
Size
(Inches)

Cover
Body
Opening

Form
No.†

Catalog Number
Aluminum

1
1
1

GRU50-A*
GRU75-A*
GRU100-A

GRU Aluminum Box
Furnished with externally threaded
aluminum surface cover, O-Ring.
five threaded hubs, and three close-up
plugs. For additional covers, see Page 8.
1/2
3/4
1

3.38
3.38
3.38

GRUE Aluminum Box
Furnished with internally threaded
aluminum surface cover,
five threaded hubs, and three close-up
plugs.
GRUE50-A*
GRUE75-A*
GRUE100-A

J

1/2
3/4
1

3.38
3.38
3.38

GRU Series
Dimensions in Inches
Hub
Size (Inches)

A

B

1/2
3/4
1

3.75
3.75
3.75

2.25
2.25
2.44

2.69
2.69
2.88

9.5
9.5
9.5

5.7
5.7
6.2

6.8
6.8
7.3

1.8
1.8
2.4

3.5
3.5
3.7

10.3
10.3
13.8

5.1
5.1
5.6

Dimensions in Inches
Hub
Size (Inches)

A

B

C

D

E

F

G

1/2
3/4
1

4.25
4.25
4.25

2.25
2.25
2.44

2.75
2.75
3.00

4.06
4.06
5.44

2.06
2.06
2.25

5.7
5.7
6.2

7.0
7.0
7.6

C

D
.69
.69
.94

E
1.38
1.38
1.44

F

G

4.06
4.06
5.44

2.00
2.00
2.19

Dimensions in Centimeters
1/2
3/4
1
GRUE Series

.69
.69
.94

1.44
1.44
1.50

Dimensions in Centimeters
1/2
3/4
1

10.8
10.8
10.8

1.8
1.8
2.4

3.7
3.7
3.8

10.3
10.3
13.8

5.2
5.2
5.7

For cubic inches information, see page J-19
†For numbers designate body and matching cover sizes.
* CSA Certified
Effective September, 2005
Copyright 2005
PAGE 12

800-621-1506
www.appletonelec.com

Class I, Div. 1 and 2
Groups C,D
Class II, Div. 1 and 2
Groups E,F,G
Class III

J-13

GRJS Universal Conduit Outlet Box:
Explosionproof, Dust-Ignitionproof
UNILETS® for Use with Threaded Metal Conduit.

Box
Type

Conduit
Size (Inches)

Cover
Opening (Inches)

Catalog Number

GRJS Universal Box with Cover
Internally threaded malleable iron body with
externally threaded aluminum surface cover.
Complete with five threaded universal
openings and three close-up plugs.
1/2
2.56
3/4
2.56
1
2.56

GRJS50
GRJS75
GRJS100

GRJS Covers, Aluminum
GRJSK

GRJSK-50

Surface

Hub

GRJS Dimensions in Inches and Centimeters

1/2

2.56

GRJSK

2.56

GRJSK-50

Fraction/Decimal
Equivalents (Inches)
Decimal
0.06
0.13
0.19
0.25
0.31
0.38
0.44
0.50
0.56
0.63
0.69
0.75
0.81
0.88
0.94
1.00

J

Fraction
1/16
1/8
3/16
1/4
5/16
3/8
7/16
1/2
9/16
5/8
11/16
3/4
13/16
7/8
15/16
1

For cubic inches information, see page J-19
Effective September, 2005
Copyright 2005

800-621-1506
www.appletonelec.com
PAGE 13

J-14

Class I, Div. 1 and 2
Groups C,D
Class II, Div. 1 and 2
Groups E,F,G
Class III

GRJ Conduit Outlet Boxes: Malleable Iron;
Explosionproof, Dust-Ignitionproof
UNILETS® for use with Threaded Metal Conduit.
Furnished with Internal Ground Screw.

Conduit
Size (Inches)

Cover
Opening (Inches)

Catalog Number
Malleable Iron

GRJC

1/2
3/4

2.13
2.13

GRJC50
GRJC75

GRJCA

1/2
3/4

2.13
2.13

GRJCA50
GRJCA75

GRJEA

1/2
3/4

2.13
2.13

GRJEA50
GRJEA75

GRJL

1/2
3/4

2.13
2.13

GRJL50
GRJL75

GRJT

1/2
3/4

2.13
2.13

GRJT50
GRJT75

GRJTA

1/2
3/4

2.13
2.13

GRJTA50
GRJTA75

GRJX

1/2
3/4

2.13
2.13

GRJX50
GRJX75

2.13

GRJK-S

J

Box
Type

GRJ Covers
Surface

For cubic inches information, see page J-19
GRJ Dimensions in Inches and Centimeters

Effective September, 2005
Copyright 2005
PAGE 14

800-621-1506
www.appletonelec.com

Class I, Div. 1 and 2
Groups D
Class II, Div. 1 and 2
Groups E,F,G
Class III

J-15

ER Conduit Outlet Boxes:
Explosionproof, Dust-Ignitionproof
UNILETS® for use with Threaded Metal Conduit.

Conduit
Size (Inches)

Catalog Number
Malleable Iron

ERC

1/2
3/4

ERC50
ERC75

ERLB

1/2
3/4

ERLB50
ERLB75

ERLL

1/2
3/4

ERLL50
ERLL75

ERLR

1/2
3/4

ERLR50
ERLR75

ERT

1/2
3/4

ERT50
ERT75

ERTB

1/2
3/4

ERTB50
ERTB75

J

Box
Type

ER Dimensions

Dimensions in Inches
Hub
Size (In.)

A

B

C

D

E

F

G

H

1/2
3/4

3.69
4.00

1.50
1.75

2.00
2.13

5.00
5.44

.56
.69

.69
.69

1.50
1.75

1.06
1.13

3.8
4.5

5.1
5.4

12.7
13.8

1.4
1.8

1.8
1.8

3.8
4.5

2.7
2.9

Dimensions in Centimeters
1/2
3/4

9.4
10.2

For cubic inches information, see page J-19
*If bigger sizes needed, see GR Series on page J-4

Effective September, 2005
Copyright 2005

800-621-1506
www.appletonelec.com
PAGE 15

J-16

Class I, Div. 1 and 2
Groups C,D
Class II, Div. 1 and 2
Groups E,F,G
Class III

GRUO and GRUJ Conduit Outlet Boxes
with Multiple Hubs:
Explosionproof, Dust-Ignitionproof
UNILETS® for use with Threaded Metal Conduit.
Catalog Number
Malleable Iron

Number and Size of Hubs

GRUO Box with Cover
Externally threaded malleable iron body complete with
internally threaded malleable iron surface cover; eight conduit
hubs and close-up plugs for all but three 3/4” hubs.
Each Side
1—3/4”

Top
2—3/4”

Cover opening—3.25”

Bottom
2—3/4”
1—1”

Back
1—3/4”

GRUO-2

GRUJ Box with Cover
Externally threaded malleable iron body complete with internally
threaded malleable iron surface cover; choice of hub arrangements, furnished with close-up plugs for all
but three 3/4” hubs.
Each Side
2—3/4”
2—3/4”
2—3/4”

Top
2—3/4”
2—3/4”
2—3/4”

Bottom
1—3/4”
1—3/4”
1—3/4”

Back
None
4—3/4”
4—1”

GRUJ-1P
GRUJ-2P
GRUJ-3P

Cover opening—3.25”

GRU Covers

J

Malleable iron with internal threads.
For GRUO and GRUJ listed above.
Surface

GRUK-S

Cover opening—3.25”

For cubic inches information, see page J-19
Effective September, 2005
Copyright 2005
PAGE 16

800-621-1506
www.appletonelec.com

J-17

Class I, Div. 1 and 2
Groups C,D
Class II, Div. 1 and 2
Groups E,F,G
Class III
NEMA 3,4*

GRU Conduit Outlet Boxes with Union Hubs:
Explosionproof, Dust-Ignitionproof
UNILETS® for use with Threaded Metal Conduit.
Furnished with Internal Ground Screw.

Box Type

GRUT50

Conduit Size
(Inches)

Cubic Inch
Capacity

Catalog Number
Cover Opening
(Inches)
Malleable Iron Aluminum

GRU with Union Hubs
GRUT 1/2” thru 1” and GRUSE 1/2” thru 3/4” — Malleable iron externally threaded body
complete with internally threaded malleable iron surface cover.
GRUSE 1” — Copper free aluminum cover and body with externally threaded cover
GRUT

GRUSE

GRUT50

1/2

19

3.25

3/4

19

3.25

GRUT75

1

19

3.25

GRUT100

1/2

19

3.25

GRUSE50

3/4

19

3.25

GRUSE75

1

29

3.75

GRUSE100

GRUSE50
GRU Covers
Malleable iron with internal threads.Fit GRUT and GRUSE listed aboveg.
Surface
* Applies to GRUSE100 only.

GRUK-S

3.25

g Does not apply to GRUSE100

Dimensions
GRUT

GRUSE50 and GRUSE75
GRUT
Dimensions in Inches

J

Hub Size
(Inches) A
1/2
3/4
1

4.19
4.19
4.19

B
2.69
2.69
2.69

C

D

6.25
6.25
6.50

.75
.75
.94

E

F

8.25
8.25
8.75

2.31
2.31
2.31

Dimensions in Centimeters

GRUSE100

1/2
3/4
1

10.6
10.6
10.6

6.8
6.8
6.8

15.9
15.9
16.5

1.9
1.9
2.4

21.0
21.0
22.2

5.9
5.9
5.9

GRUSE 1/2” and 3/4”
Dimensions in Inches
Hub Size
(Inches)

A

B

C

1/2 and 3/4 4.19 2.56 6.13

D

E

.94

8.00

F

G

2.19 2.13

Dimensions in Centimeters
1/2 and 3/4 10.6 6.5

Effective August, 2008
Copyright 2008

15.6

2.4 20.3 5.7 5.4

800-621-1506
www.appletonelec.com
PAGE 17

J-18

Class I, Div. 1 and 2
Groups B*,C,D
Class II, Div. 1 and 2
Groups E,F,G
Class III

GU Conduit Outlet Boxes:
Explosionproof, Dust-Ignitionproof
UNILETS® for Use with Threaded Metal Conduit.
Furnished with Internal Ground Screw.

Hub
Type

Conduit
Size
(Inches)

Cover
Opening
(Inches)

Catalog Number*
Malleable Iron

J

GUC

1/2
3/4
1

3.38
3.38
3.38

GUC50
GUC75
GUC100

GUL

1/2
3/4
1

3.38
3.38
3.38

GUL50
GUL75
GUL100

GULB

1/2
3/4
1

3.38
3.38
3.38

GULB50
GULB75
GULB100

GUT

1/2
3/4
1

3.38
3.38
3.38

GUT50
GUT75
GUT100

GUX

1/2
3/4
1

3.38
3.38
3.38

GUX50
GUX75
GUX100

Dimensions in Inches and Centimeters
GU Series
Dimensions in Inches
Hub Size (Inches)

A

B

C

D

E

F

1/2
3/4
1

4.28
4.28
4.28

2.44
2.44
2.44

2.97
2.97
2.97

.75
.75
.94

.81
.81
.94

2.25
2.25
2.25

10.9
10.9
10.9

6.2
6.2
6.2

7.5
7.5
7.5

1.9
1.9
2.4

2.1
2.1
2.4

5.7
5.7
5.7

Dimensions in Centimeters
1/2
3/4
1

For cubic inches information, see page J-19
* In Group “B” atmospheres, all conduit runs must have a sealing fitting (not supplied) field installed adjacent to the enclosure.
Effective June, 2008
Copyright 2008
PAGE 18

800-621-1506
www.appletonelec.com

J-19

Wiring Capacity:
Explosionproof Conduit Outlet Boxes

Volume in Cubic Inches and Cubic Centimeters
Wiring Capacity
Size

CPU
ER
ER
GR
GR
GR

Form 20
1/2”
3/4”
Form 1
Form 2
Form 3 (1-1/2”)
Form 3 (2”)
All
All
All
All
-50C, -75C, -100C
1DC
1/2”, 3/4”
1/2”, 3/4”
1”
1/2”, 3/4”
1”
All
All
All
All
All

GRF
GRH
GRJ
GRJS
GRK (Canopy)GRK (Dome)
GRU (Union Hubs)
GRU (Universal)
GRUE
GRUJ
GRUO
GRSS
GRSSA
GU

Vol./cu. in.

Vol./cu. cm

21.0
4.8
7.3
18.0
31.0
72.0
76.0
18.0
13.8
7.3
12.5
16.0
6.0
19.0
13.5
17.5
15.3
18.5
25.0
25.0
29.0
29.0
19.0

344.1
78.7
119.3
295.0
508.0
1179.9
1245.4
295.0
226.2
119.3
204.8
262.2
98.3
311.4
221.2
286.8
250.7
303.2
409.7
409.7
475.2
475.2
311.4

JJ

Type

ELBD 90° Pulling Unilets
Size

1/2

3/4

1

1-1/4

1-1/2

2

2-1/2

3

3-1/2

4

Capacity in Cubic Inches
ELBD

7.0

7.0

25.0

25.0

69.0

69.0

240.0

240.0

540.0

540.0

3932.9

8849.0 8849.0

Capacity in Cubic Centimeters
ELBD

114.7

GRSS
Effective September, 2005
Copyright 2005

114.7 409.7

GU

409.7 1130.7 1130.7 3932.9

ELBD

800-621-1506
www.appletonelec.com
PAGE 19

J-20

®

J
Effective September, 2005
Copyright 2005
PAGE 20

800-621-1506
www.appletonelec.com



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