Enclosures
HPS products are available in Type 1, 2, 3R, 3RX, 4, and 4X enclosures. HPS also offers an enhanced version of Type 3R in the form of Type 3RE and 3RE Plus for outdoor applications. See detailed description of enclosure types below.
Not all product lines or kVA sizes are compatible with all enclosure types. Please use the E-Quotes Lite product configurator to determine which options are most commonly available.
Comparison of Enclosure Types for Indoor and Outdoor Non-Hazardous Locations
| Indoor | Indoor/Outdoor | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CSA C22.2 No 94.2 Enclosure Type | 1a | 2a | 5 | 12 | 12K | 13 | 3 | - | 3Ra | - | 3S | - | 4 | 4X | |
| NEMA 250 Enclosure Type | 1a | 2a | 5 | 12 | 12K | 13 | 3 | 3X | 3Ra | 3RXa | 3S | 3SX | 4 | 4X | |
| Equivalent IEC 60529 IP designation | IP20 | IP22 | IP53 | IP54 | IP54 | IP54 | IP55 | IP55 | IP24 | IP24 | IP55 | IP55 | IP66 | IP66 | |
| Provides a degree of protection against these environmental conditions |
Accidental contact with live parts | X | X | X | X | X | X | X | X | X | X | X | X | X | X |
| Falling dirt | X | X | X | X | X | X | X | X | X | X | X | X | X | X | |
| Dripping and light splashing of non-corrosive liquids |
X | X | X | X | X | X | X | X | X | X | X | X | X | ||
| Circulating dust, lint, fibers and flyings |
X | X | X | X | X | X | X | X | X | ||||||
| Settlingd dust, lint, fibers and flyingsd | X | X | X | X | X | X | X | X | X | X | |||||
| Wind-blown dust | X | X | X | X | X | X | |||||||||
| Rain, snow, and external formation of ice or sleetb | X | X | X | X | X | X | X | X | |||||||
| Horizontal blowing rain, snow or sleet | X | ||||||||||||||
| External formation of ice or sleetc | X | X | |||||||||||||
| Hose down and splashing water | X | X | |||||||||||||
| Corrosion | X | X | X | X | |||||||||||
| Oil and coolant seepage | X | X | X | ||||||||||||
| Oil and coolant seepage, spraying and splashing | X | ||||||||||||||
Notes
a - These enclosures may be ventilated
b - External operating mechanism(s) is not required to operate when the enclosure is ice covered
c - External operating mechanism(s) shall be operable when the enclosure is ice covered
d - These fibers are flyings are non-hazardous and are not considered Class III type ignitable fibers or combustible flyings
e - Since IEC 60529 does not specify degrees of protection for many conditions considered within CSA C22.2 No. 94.5, the IEC classifications cannot be exactly equated to North American Type numbers. the North American Type numbers meet or exceed the test requirements for the associated IP classifications. This table cannot be used to convert from IEC classifications to North American Type designations.
References: CSA C22.2 No. 94.2, CSA C22.1 (CEC), NEMA 250, NEMA document - NEMA Enclosure Types
Disclaimer: This table is for reference purposes only. Please refer to appropriate standard for enclosure selection to meet your application specifications.
Enclosure Types
TYPE 3R
This is a general purpose ventilated enclosure 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 the ingress of solid foreign objects (falling dirt); and 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.
Transformer Enclosure Accessories
Rodent Kit
Ensure the safe operation of your transformer by protecting from unwanted visitors with the optional rodent kit. Rodent kits are available for DH1-DH10 Type 3R enclosures.
Grounding Kit
For applications requiring more than one ground connection, HPS offers an optional grounding kit. The grounding kit is available for DH1-DH10 Type 3R enclosures.
TYPE 3RE
This is a general purpose ventilated enclosure 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 the ingress of solid foreign objects (falling dirt and circulating dust); and to provide a degree of protection with respect to harmful effects on the equipment due to the ingress of water (rain, sleet, circulating snow); and that will be undamaged by the external formation of ice on the enclosure.
TYPE 3RE Plus
HPS Type 3RE Plus enclosures provide the ultimate solution for safeguarding Medium Voltage transformers against the most unforgiving outdoor conditions, including relentless rain and snowstorms.
The increase in outdoor installations, driven by the growing adoption of EV charging and renewable energy, highlights the significance of our solution in safeguarding critical electrical equipment.
Resilience to Snow and Rain: Through rigorous testing it withstood wind speeds of up to 120 km/h (with snow) and snow particles as tiny as 350 microns. Additionally, it excelled in rain tests, enduring wind speeds of up to 130 km/h, with a water discharge rate of 7.5 GPM.
Enhanced Outdoor Design: Designed for outdoor applications with advanced features such as louvers, filters, and a slanted enclosure roof.
Simple Filter Replacement: Easily replace filters even when the transformer is energized.
Certification & Testing: UL certified and has a notable level of protection with proven test results.
Note: While our enclosure is designed to withstand severe weather conditions, we recommend consulting with our experts to ensure proper protection for your specific needs. Your safety is our priority.
TYPE 4
This is a general purpose non-ventilated enclosure 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 the ingress of solid foreign objects (falling dirt and circulating dust); and to provide a degree of protection with respect to harmful effects on the equipment due to the ingress of water (rain, sleet, circulating snow); and that will be undamaged by the external formation of ice on the enclosure.
TYPE 4X
This is a general purpose non-ventilated enclosure 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 the ingress of solid foreign objects (windblown dust); and to provide a degree of protection with respect to harmful effects on the equipment due to the ingress of water (rain, sleet, snow, splashing water, and hose directed water); that provides an additional level of protection against corrosion; and that will be undamaged by the external formation of ice on the enclosure. (Note: not submersible). Please see our TENV product options here.
TYPE 12
This is a general purpose non-ventilated enclosure constructed (without knockouts) for indoor use only 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 the ingress of solid foreign objects (falling dirt and circulating dust, lint, fibers, and filings); and to provide a degree of protection with respect to harmful effects on the equipment due to the ingress of water (dripping and light splashing). (Note: not submersible).