Enclosure Types

NEMA Type 1 Indoor Enclosures

The standard Power-Zone 4 switchgear enclosure is NEMA Type 1, general purpose. NEMA Type 1 enclosures are dead front, metal-enclosed structures.

Power-Zone 4 Switchgear, NEMA Type 1, Indoor Enclosure

Standard Features

Secondary wiring areas
Removable, steel top plates over conduit entrance
Hinged front doors with latches
Circuit breaker or instrument compartment
Bus compartment
Cable compartment
Capability for future expansion
Two-piece removable side and back plates
1 1/2-inch-high base channels
Electro-deposition paint process on structural parts
ANSI #49 paint color
Customer nameplates for each compartment

Available Options

Strip heaters in circuit breaker, bus, and cable compartments
Overhead circuit breaker lifting device or floor crane (2 types)
Gasketing around doors and between sections
Filtering of doors and vents*^,*
Lockable, hinged rear doors
Lockable, hinged front doors
18-inch-high pull box*
Bottom plates
Rodent barriers
Custom paint
White instrument mounting pans

NEMA Type 3R Walk-In Enclosures

Power-Zone 4 switchgear is also available in a NEMA Type 3R walk-in enclosure for outdoor installation.

NEMA Type 3R, Walk-In Outdoor Enclosure

Standard Features

Exhaust fan ventilation/inside temperature control
Exterior lighting
Undercoating
Inside emergency lighting
Choice of Top or Bottom entry/exit for incoming and outgoing cables

Available Options

Front aisle with steel entrance door equipped with panic hardware
Lockable, hinged rear doors
Interior fluorescent lighting
Three-way light switch and convenience GFCI receptacles near the entrance door
Strip heaters in circuit breaker and bus compartments
Overhead circuit breaker lifting device (traveling lifter assembly)
Removable gasketed steel cover plates over conduit entrance
One-piece construction for ease of installation

NOTE: Assembly may be required if shipped split.

NOTE:

Refer to Special Applications for elevation/altitude de-rating requirements.
Refer to Figures 91, 92, 105 and 106 for NEMA 3R dimensions.
Not available with arc resistant switchgear.
From NEMA, the definition of NEMA Type 3R is: Enclosures constructed for either indoor or outdoor use to provide a degree of protection to personnel against access to hazardous parts; to provide a degree of protection of the equipment inside the enclosure against ingress of solid foreign objects (falling dirt); to provide a degree of protection with respect to harmful effects on the equipment due to the ingress of water (rain, sleet, snow); and that will be undamaged by the external formation of ice on the enclosure.

For applications in high winds, barriers around the equipment or an electrical house is recommended. Contact Schneider Electric for specific application needs.

Drip Resistant Enclosures

Drip Resistant enclosures are NEMA 1 (indoor) rated enclosures supplied with an additional drip hood, which offers additional degree of protection against dripping. Drip Resistant enclosures are an add-on option to the standard Power-Zone 4 switchgear section.

Drip Resistant Enclosure


Drip hood is ANSI 49 as standard. Shown in blue for clarity.

References

Document Number: 80298-003-02, Drip/Sprinkler Resistant Installation for Power-Zone 4 Low Voltage Switchgear
Document Number: 80280-DS-006, Drip Hood and Sprinkler Resistant Guidelines
2012 Canadian Electrical Code, CEC Rule # 26-008 Sprinkler Equipment and Appendix B*
2012 CEC Code Handbook
UL50E

NOTE:

Standard overhead lifters are not available for drip resistant design.
Not available with arc resistant switchgear

Sprinkler Resistant Enclosures

Sprinkler resistant enclosures are NEMA 1 (indoor) rated enclosures supplied with an additional drip hood, gasketing, vent louvers, and transparent covers, which provide an additional degree of protection against dripping and light splashing of liquids. Sprinkler resistant enclosures are an add-on option to the standard Power-Zone 4 switchgear section.

Sprinkler Resistant Enclosure


(Gasketing is behind covers and doors) Drip hood and vent louvers are ANSI 49 as standard. Shown in blue for clarity.

References

Document Number: 80298-003-02, Drip/Sprinkler Resistant Installation for Power-Zone 4 Low Voltage Switchgear
Document Number: 80280-DS-006, Drip Hood and Sprinkler Resistant Guidelines
2012 Canadian Electrical Code, CEC Rule # 26-008 Sprinkler Equipment and Appendix B*
2012 CEC Code Handbook
UL50E

LV Design Sprinkler Resistant Test

Duration of one hour.
Quantity of water applied to surface under test is at least 0.016 in./unit surface/minute (25 mm/area/hour).
Spray angle up to 45 degrees from the vertical.
Water Pressure of 5 psi.

NOTE:

Standard overhead lifters are not available for drip resistant design.
Not available with arc resistant switchgear

Indoor Water Resistant Enclosures

Indoor Water Resistant (IWR) enclosures are NEMA 1 (indoor) rated enclosures supplied with a door-over-door construction, a 12 inch additional roof, and other special features which are tested as a system to meet the ANSI C37.20.1 specification, Rain Test for Outdoor Low Voltage Switchgear. IWR enclosures are an add-on option to the standard Power-Zone 4 switchgear section.

Indoor Water Resistant Enclosure

Standard color is ANSI 49. Customer requested a special color in above image.

References

Document Number: 80298-151-03, Indoor Water-Resistant (IWR) Enclosure Installation For Use on Power-Zone 4 Low Voltage Switchgear and Power-Style QED-6 Switchboards
Document Number: 80280-DS-002, Power-Zone 4 and QED-6 IWR Enclosure Mounting Pad Dimension Information
CSA-C22.2 No. 94-M91-Jan. 1991
Subjected to 3R Rain Test per ANSI/IEEE C37.20.1-2002, sect. 6.2.10
UL50E
Square D Self-Certified 3R Rain: Test # P000645L2

NOTE:

Standard overhead lifters are not available for drip resistant design.
Special floor crane option required.
Does not cover external icing, outdoor corrosion protection, gasket or other tests used for Type 3R enclosures.
Not available with arc resistant switchgear.