Cut Sheet
Class I, Division 1 and 2, Groups B, C, D
Class II, Division 1 and 2, Groups E, F, G
Class III
NEMA 3, 4
Enclosures and Junction Boxes
EnclosurEs and Junction BoxEs: Hazardous location conduit outlEt BoxEs
Visit our website at www.appletonelec.com or contact us at (800) 621-1506.
© November 2011
500
GR 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/Millimeters
Volume
Capacity
in
3
/dm
3
Form
Number
Catalog Number
Malleable Iron
Body With
Aluminum Cover
Aluminum
Body with
Aluminum Cover
GRE
1/2 3.38/85.9 18.0/.29 1 GRE50 GRE50-A
3/4 3.38/85.9 18.0/.29 1 GRE75 GRE75-A
1 3.38/85.9 18.0/.29 1 GRE100 GRE100-A
1-1/4 3.94/100.1 31.0/.51 2 GRE125 GRE125-A
1-1/2 4.88/124.0 72.0/1.18 3 GRE150 GRE150-A
GRC
1/2 3.38/85.9 18.0/.29 1 GRC50 GRC50-A
3/4 3.38/85.9 18.0/.29 1 GRC75 GRC75-A
1 3.38/85.9 18.0/.29 1 GRC100 GRC100-A
1-1/4 3.94/100.1 31.0/.51 2 GRC125 GRC125-A
1-1/2 4.88/124.0 72.0/1.18 3 GRC150 GRC150-A
2 4.88/124.0 76.0/1.25 3 GRC200 GRC200-A
GRL
1/2 3.38/85.9 18.0/.29 1 GRL50 GRL50-A
3/4 3.38/85.9 18.0/.29 1 GRL75 GRL75-A
1 3.38/85.9 18.0/.29 1 GRL100 GRL100-A
1-1/4 3.94/100.1 31.0/.51 2 GRL125 GRL125-A
1-1/2 4.88/124.0 72.0/1.18 3 GRL150 GRL150-A
2 4.88/124.0 76.0/1.25 3 GRL200 GRL200-A
GRLB
1/2 3.38/85.9 18.0/.29 1 GRLB50 GRLB50-A
3/4 3.38/85.9 18.0/.29 1 GRLB75 GRLB75-A
1 3.38/85.9 18.0/.29 1 GRLB100 GRLB100-A
1-1/4 3.94/100.1 31.0/.51 2 GRLB125 GRLB125-A
1-1/2 4.88/124.0 72.0/1.18 3 GRLB150 GRLB150-A
2 4.88/124.0 76.0/1.25 3 GRLB200 GRLB200-A
GRN
1/2 3.38/85.9 18.0/.29 1 GRN50 GRN50-A
3/4 3.38/85.9 18.0/.29 1 GRN75 GRN75-A
1 3.38/85.9 18.0/.29 1 GRN100 GRN100-A
1-1/4 3.94/100.1 31.0/.51 2 GRN125 GRN125-A
1-1/2 4.88/124.0 72.0/1.18 3 GRN150 GRN150-A
GRT
1/2 3.38/85.9 18.0/.29 1 GRT50 GRT50-A
3/4 3.38/85.9 18.0/.29 1 GRT75 GRT75-A
1 3.38/85.9 18.0/.29 1 GRT100 GRT100-A
1-1/4 3.94/100.1 31.0/.51 2 GRT125 GRT125-A
1-1/2 4.88/124.0 72.0/1.18 3 GRT150 GRT150-A
2 4.88/124.0 76.0/1.25 3 GRT200 GRT200-A
GRX
1/2 3.38/85.9 18.0/.29 1 GRX50 GRX50-A
3/4 3.38/85.9 18.0/.29 1 GRX75 GRX75-A
1 3.38/85.9 18.0/.29 1 GRX100 GRX100-A
1-1/4 3.94/100.1 31.0/.51 2 GRX125 GRX125-A
1-1/2 4.88/124.0 72.0/1.18 3 GRX150 GRX150-A
2 4.88/124.0 76.0/1.25 3 GRX200 GRX200-A
In Class I, Division 1, Group B atmospheres, all conduit runs must have a sealing fitting (not supplied) field-installed adjacent to the enclosure.
① Other covers available—see GR and GRF Conduit Outlet Box Covers page. Order separately.
For malleable iron body and cover, add suffix -M.
Form number designates body and matching cover sizes. To order body without cover, add suffix -LC to catalog number.
PVC coating available, add suffix -PVC to catalog number.