Enclosures

Indoor Enclosures
Interior Mounts to Box Studs	MH Box	Front (Type 1) Enclosure for 400–600 A Interiors
Mono-Flat Front (Type 1 Enclosure) for 100–250 A Interiors	Concealed Hinge Used on 100–600 A Trim Fronts	NEMA 1 Enclosure with Vented Hinged Trim Front with 3 Point Latch (required if 175 A or 200 A QO(VH) circuit breakers are installed)

Indoor Enclosure Accessories
Flush Lock (standard) Catalog No. PK4FL		Sliding Vault Lock (optional) Catalog No. PK5FL		Key NSR-251 Catalog No. LP9618

Enclosure Types

Type	Environment	Protects Against
Type 1	Indoor	Contact with the enclosed equipment, falling dirt
Type 2	Indoor	Type 1, plus Dripping and light splashing of non-corrosive liquids
Type 3R	Indoor / Outdoor	Type 2, plus Rain, snow, and sleet
Type 4	Indoor / Outdoor	Type 3R, plus Will be undamaged by the external formation of ice on the enclosure Circulating dust, lint, fiber Settling airborne dust, lint, fibers Windblown dust Hosedown and splashing water
Type 4X	Indoor/outdoor	Type 4, plus Corrosive agents
Type 5	Indoor	Type 2, plus Settling airborne dust, lint, fibers, and flyings
Type 12	Indoor	Type 2, plus Circulating dust, lint, fibers, and flyings Settling airborne dust, lint, fibers, and flyings Oil and coolant seepage

Indoor Enclosures (NEMA Types 1 and 2)

Boxes (MH):

Galvanized steel with removable endwalls, one is provided with knockouts and the other is blank.
Standard enclosure sizes:
- 20 in. (508 mm) wide x 5.75 in. (146 mm) deep, 600 A main lug interior max. or 400 A main circuit breaker max.
- 20 in. (508 mm) wide x 8.75 in. (223 mm) deep, for PowerPacT L main circuit breaker interior.
Enclosure and interior mounting instructions are found in the information manual shipped with the interior.
Interiors mount directly to studs in the MH enclosure. Interior mounting brackets are not required.
Type 2 enclosure includes a driphood.
- Surface-mounted trim only.
NOTE: Also available with knockouts / blank endwalls both ends.

NOTE: A wide variety of enclosure widths and height extensions are available for factory assembled panelboards.

NEMA 1 NQ Enclosure Commercial Reference Structure

Standard Width (20”) and Depth (5.75”) NEMA 1 Enclosures
MH 50 BE
				BE – Both End Walls blank; KE – Knockouts in Both End Walls; Blank – Knockouts in one End Wall, the other is blank (standard)
		50 –	Nominal Length (inches); 26” minimum 92” maximum
	MH – Enclosure Family (NEMA 1, 2 Covers)
Deep (8.75”) NEMA 1 Enclosures
MH 62 D9
				D9 – 8.75” deep; both end walls are blank blank – 5.75” deep
		50 –	Nominal Length (inches); 26” minimum 92” maximum
	MH – Enclosure Family (NEMA 1, 2 Covers)
Wide Gutter (26” width) NEMA 1 Enclosures (both end walls are blank)
MH 68 D9 L3R3
					L3R3 – 3” extension to left & right gutter L6 – 6” left gutter extension (factory assembled only) R6 – 6” right gutter extension (factory assembled only)
				D9 – 8.75” deep; both end walls are blank blank – 5.75” deep
		68 –	Nominal Length (inches); 44” minimum 92” maximum
	MH – Enclosure Family (NEMA 1, 2 Covers)

Trims Fronts (NC):

Finished with gray baked enamel over cleaned phosphatized steel (ANSI 49).
Flush or surface mounted (Type 2 surface only).
Door has flush lock. Uses NSR-251 key.
Directory card located on the inside of the door.
Trim fronts for 400–600 A interiors are vented and mount to the enclosure with trim screws. Door hinges are concealed.
Optional hinged trim fronts are available. These meet most door-in-door specifications.
NEMA 1 trim fronts may be factory ordered with special features such as outer door locks, padlock hasp, or welded metal directory card holders.

Hinged Trim on Surface Mounted Enclosure

NOTE: Special trim fronts are also available, including: welded metal directory card holders; three point latches; custom paint colors, stainless steel, custom door locks, taller and/or wider trim fronts.

NEMA 1 NQ Trim Front Commercial Reference Structure

Standard Width (20”) and Depth (5.75”) NEMA 1 Enclosures
NC 50 V F 3P HR
							HR – Hinged Right; Blank – Mono-Flat (standard)
						3P – three-point latch trim front; Blank – flush mounted lock (standard)
					F – Flush mount; S – Surface mount
				V – Vented; (standard for 400 and 600 A interiors) Blank – not vented (standard for 100 and 225 A interiors)
		50 –	Nominal Length (inches); 26” minimum (62” minimum for hinged 3-point latch) 92” maximum
	NC – Trim Front Family (NEMA 1, 2 Covers)
Wide Gutter (26” width) Trim Fronts
NC 68 V S 3P HR L3R3
								L3R3 – 3” extension to left & right gutter L6 – 6” left gutter extension (factory assembled only) R6 – 6” right gutter extension (factory assembled only)
							HR – Hinged Right; Blank – Mono-Flat (standard)
						3P – three-point latch trim front; Blank – flush mounted lock (standard)
					F – Flush mount; S – Surface mount
				V – Vented; (standard for 400 and 600 A interiors) Blank – not vented (standard for 100 and 225 A interiors)
		68 –	Nominal Length (inches); 44” minimum (68” minimum for 3-point latch) 92” maximum
	NC – Trim Front Family (NEMA 1, 2 Covers)
NQ 14” Wide Panelboard Trim Fronts
NQC5 32 S
				F – Flush mount; S – Surface mount
		32 –	Nominal Length (inches); 26” minimum 56” maximum
	NQC – Trim Front Family (NEMA 1 Covers)

Rainproof (Type 3R) and Dust Resistant (Type 5 and 12) Enclosures

Rain and Dust Resistant Enclosures
New Vented NEMA Type 3R Enclosure	Type 3R, 5, and 12 Enclosure	Vault Handle with Lock Catalog No. PK4NVL

Finished with gray baked enamel over cleaned phosphatized galvanized steel (ANSI 49).
Provisions for two ground bars.
Directory card holder on inside of door.
No knockouts.
Uses NSR-251 key.
NEMA 3R / 5 / 12 enclosure features:
- removable drain screw for Type 3R applications.
- gasketed door has vault handle with lock.
- 21" wide.
- 6.5" deep.
Vented NEMA Type 3R Enclosure features:
- inner and outer doors have handle with lock.
  - outer door secured with quarter-turn fasteners and screws.
- 26" wide.
- 8.75" deep.