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
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© November 2011
503
GR and GRF Conduit Outlet Box Covers
Explosionproof, Dust-Ignitionproof
Covers and O-rings Fit Bodies with Corresponding Form Numbers.
Hub Type
Cover Opening
Inches/Millimeters
Fixture Stem Size
Inches/Millimeters
Form
Number 
Catalog Number
Malleable Iron Aluminum
Surface
3.38/85.9 1 GRK-1M GRK-1
3.94/100.1 2 GRK-2M GRK-2
4.88/124.0 3 GRK-3M GRK-3
Sealing
3.38/85.9 1 GRK-1SC GRK-1SC-A
3.94/100.1 2 GRK-2SC GRK-2SC-A
4.88/124.0 3 GRK-3SC GRK-3SC-A
2”DeepDome
UL Listed: E185964
3.38/85.9 1 — GRK-1DC
UnionHub 3.38/85.9 0.75/19.1 1 GRK-75U GRK-75UA
Hub
3.38/85.9 0.50/12.7 1 GRK-50 GRK50-A
3.38/85.9 0.75/19.1 1 GRK-75 GRK75-A
Canopy
Length4-1/2”
3.38/85.9 0.50/12.7 1 GRK-50C —
3.38/85.9 0.75/19.1 1 GRK-75C —
3.38/85.9 1.00/25.4 1 GRK-100C —
Catalog Number
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 GRG-1
2 GRG-2
3 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 1+2 GRTB6-12
6positionterminalblockkit 3 GRTB6-3
12positionterminalblockkit 3 GRTB12-3
 In Class I, Division 1, Group B atmospheres, all conduit runs must have a sealing fitting (not supplied) field-installed adjacent to the enclosure.
 Form numbers designate cover and matching body sizes.
 PVC coating available, add suffix -PVC to catalog number.
 Terminal block is UL listed for 300 Volt, 25 Amp. CSA certified for 300 Volt, 13 Amp.