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Metal Enclosures Technical Specifications


An enclosure is a housing constructed to provide a degree of protection from accidental contact with the enclosed equipment and external environmental conditions. Metal enclosures are designed to house electrical, electronic, hydraulic or pneumatic controls/instrumentation. Metal enclosures provide a degree of protection against dirt, dust, oil, and water.

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Click Here for Hoffman to Hammond Part # Cross Reference

Metal Enclosures - Industry Definitions
Metal Enclosures - Enclosure Ratings
Metal Enclosures - Corrosion Information
Metal Enclosures - IEC 529 Protection Grades
Metal Enclosures - NEMA to IEC Cross-Reference
Metal Enclosures - Saginaw Industry Standards
Metal Enclosures - Hammond Disconnect Selection Guides
Metal Enclosures - Hammond Series 2000 Modular Enclosure Assembly Info
Metal Enclosures - Sources of Standards


Industry Definitions

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General Definitions Pertaining To Electrical Enclosures
Cover: An unhinged portion of an enclosure that covers an opening.

Degree of Protection: The extent of protection provided by an enclosure against access to hazardous parts, against ingress of foreign solid objects and/or against ingress of water and verified by standardized test methods.

Design Tests: Tests to demonstrate performance of a product designed to applicable standards. (Note: Design tests are not intended to be production tests.) NEMA 250-2003.

Door: A hinged portion of an enclosure that covers an opening. NEMA 250-2003.

Hazardous (Classified) Locations: Those areas, which may contain hazardous (classified) materials in sufficient quantity to create an explosion. See Article 500 of the National Electrical Code. NEMA 250-2003.

Hazardous (Classified) Materials: Those gases, vapors, combustible dusts, fibers, or flyings, which are explosive under certain conditions. NEMA 250-2003.

Hazardous Parts: Parts that are hazardous to approach or touch.
Indoor Locations: Those areas, which are protected from exposure to the weather. NEMA 250-2003.

Knockout: A portion of the wall of an enclosure so fashioned that it may be removed readily by a hammer, screwdriver, and pliers at the time of installation in order to provide a hole for the attachment of an auxiliary device or raceway, cable, or fitting. NEMA 250-2003.

Non-Hazardous Locations: Areas, which do not contain hazardous (classified) materials in sufficient quantity to create an explosion. NEMA 250-2003.

Non-Ventilated: Constructed so as to provide no intentional circulation of external air through the enclosure. NEMA 250-2003.

Oil-Resistant Gaskets: Those made of material, which is resistant to oil, or oil fumes. NEMA 250-2003.

Outdoor Locations: Those areas, which are exposed to the weather. NEMA 250-2003.

Ventilated: Constructed so as to provide for the circulation of external air through the enclosure to remove excess heat, fumes, or vapors. NEMA 250-2003.


Enclosure Ratings (NEMA Standards)

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Definitions Pertaining to Non-Hazardous Locations

Type 1 Enclosures are constructed for indoor use to provide a degree of protection to personnel against access to hazardous parts and to provide a degree of protection of the equipment inside the enclosure against ingress of solid foreign objects (falling dirt).

Type 2 Enclosures are constructed for indoor 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 dirty, 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).

Type 3 Enclosures are 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) and windblown dusty, 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.

Type 3R Enclosures are 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.

Type 3S Enclosures are 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 and windblown dust) to provide a degree of protection with respect to harmful effects on the equipment due to the ingress of water (rain, sleet, snow), red for which the external mechanisms) remain operable when ice laden.

Type 3X Enclosures are 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) and windblown dusty, to provide a degree of protection with respect to harmful effects on the equipment due to the ingress of water (rain, sleet, snow), that provides an additional level of protection against corrosion and that will be undamaged by the external formation of ice on the enclosure.

Type 3XR Enclosures are 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), that will be undamaged by the external formation of ice on the enclosure that provides an additional level of protection against corrosion, and that will be undamaged by the external formation of ice on the enclosure.

Type 3SX Enclosures are 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 and windblown dusty, to provide a degree of protection with respect to harmful effects on the equipment due to the ingress of water (rain, sleet, snowy, that provides an additional level of protection against corrosion, and for which the external mechanisms) remain operable when ice laden.

Type 4 Enclosures are 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 and windblown dusty, 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), and that will be undamaged by the external formation of ice on the enclosure.

Type 4X Enclosures are 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 (windblown dusty, 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.

Type 5 Enclosures are constructed for indoor 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 and settling airborne dust, lint, fibers, and flyings), 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).

Type 6 Enclosures are 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 (hose directed water and the entry of water during occasional temporary submersion at a limited depths), and that will be undamaged by the external formation of ice on the enclosure.

Type 6P Enclosures are 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 (hose directed water and the entry of water during prolonged submersion at a limited depths), that provides an additional level of protection against corrosion and that will be undamaged by the external formation of ice on the enclosure.

Type 12 Enclosures are constructed (without knockouts) for indoor 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 and circulating dust, lint, fibers, and flyings), 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).

Type 12K Enclosures are constructed (with knockouts) for indoor 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 (failing dirt and circulating dust, lint, fibers, and flyings), 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).

Type 13 Enclosures are constructed for indoor 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 and circulating dust, lint, fibers, and flyings), to provide a degree of protection with respect to harmful effects on the equipment due to the ingress of water (dripping and light splashing), and to provide a degree of protection against the spraying, splashing, and seepage of oil and non-corrosive coolants.



Corrosion Information

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Corrosion Resistance of Various Enclosure Materials

Deciding on the appropriate material depends on various factors with a major consideration being resistance properties of the material to various chemical laden environments. Below is a general summary of the suitability of the materials offered in Hammond´s product lines. Please consult us for specific questions you may have for a particular environment.


Corrosion Resistance
Suggested Applications for Corrosion Resistant Materials

Material TypeNEMA Rating Suggested Application
Stainless Steel Type 3044XIndoor/outdoor applications. Ideal for hose-down and wet areas (e.g. food processing, water treatment, dairies, breweries, etc.)
Stainless Steel Type 3164XIndoor/outdoor applications. Ideal for most all environments especially marine uses.
Aluminum4Indoor/outdoor applications. Ideal for marine uses as well as environments containing solvents, petrochemicals, some acids and most sulfates and nitrates.


IEC 529 Protection Grades

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IEC (International Electrotechnical Commission)

The IEC has established an enclosure grading system that produces an IP rating. (For example, IP 54 - "5" is the first character - refer to tables I & II. "4" is the second character - refer to table III - following page).


Table I - Degrees of Protection against Hazardous Parts
(Degree of protection is indicated by the first characteristic numeral)


NumberBrief DescriptionDefinition
0Non Protected 
1Protected against access to hazardous
parts with the back of a hand.
The access probe, sphere of 50 mm ø, shall have adequate clearance from hazardous parts.
2Protected against access to hazardous
parts with a finger.
The jointed test finger of 12mm ø, 80 mm length, shall have adequate clearance from hazardous parts.
3Protected against access to hazardous
parts with a tool.
The access probe of 2.5 mm ø shall not penetrate.
4Protected against access to hazardous
parts with a wire.
The access probe of 1.0 mm ø shall not penetrate.
5Protected against access to hazardous
parts with a wire.
The access probe of 1.0 mm ø shall not penetrate.
6Protected against access to hazardous
parts with a wire.
The access probe of 1.0 mm ø shall not penetrate.

Note: In the case of the first characteristic numerals 3, 4, 5 and 6, protection against access to hazardous parts is satisfied if adequate clearance is kept. Due to the simultaneous requirement specified in Table II the definition "shall not penetrate" is given in Table I.

Table II - Degree of Protection against Solid Foreign Objects
(Degree of protection is indicated by the first characteristic numeral)

NumberBrief DescriptionDefinition
0Non Protected 
1Protected against solid foreign objects of
50 mm ø and greater.
The object probe, sphere of 50 mm ø, shall not fully penetrate.¹
2Protected against solid foreign objects of
12.5 mm ø and greater.
The object probe, sphere of 12.5 mm ø, shall not fully penetrate.¹
3Protected against solid foreign objects of
2.5 mm ø and greater.
The object probe of 2.5 mm ø shall not penetrate at all.¹
4Protected against solid foreign objects of
1.0 mm ø and greater.
The object probe of 1.0 mm ø shall not penetrate at all.¹
5Dust-protected Ingress of dust is not totally prevented, but dust shall not penetrate in a quantity to interfere with satisfactory operation of the apparatus or to impair safety.
6Dust-tightNo ingress of dust

¹ The full diameter of the object probe shall not pass through an opening of the enclosure.

Table III - Degrees of Protection against Water
(Degree of protection is indicated by the second characteristic numeral)

NumberBrief DescriptionDefinition
0Non Protected 
1Protected against vertically falling water dropsVertically falling drops shall have no harmful effects.
2Protected against vertically falling water drops when enclosure tilted up to 15°.Vertically falling drops shall have no harmful effects when the enclosure is tilted at any angle up to 15° on either side of the vertical.
3Protected against spraying waterWater sprayed at any angle up to 60° on either side of the vertical shall have no harmful effects.
4Protected against splashing waterWater splashed against the enclosure from any direction shall have no harmful effects.
5Protected against water jetsWater projected in jets against the enclosure from any direction shall have no harmful effects.
6Protected against powerful water jetsWater projected in powerful jets against the enclosure from any direction shall have no harmful effects.
7Protected against the effects of temporary immersion in water.Ingress of water in quantities causing harmful effects shall not be possible when the enclosure is temporarily immersed in water under standardized conditions of pressure and time.
8Protected against the effects of continuous immersion in water.Ingress of water in quantities causing harmful effects shall not be possible when the enclosure is continuously immersed in water under conditions which shall be agreed between manufacturer and user but which are more severe than for numeral 7.


NEMA TO IEC Cross-Reference

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(Cannot be used to convert IEC Classifications)

NEMA TYPEIP20IP22IP24IP54IP55IP66IP67
1 
2 
3 
3R 
4 
4X 
6
12, 12K 
13       

This cross reference is an approximation of NEMA and IEC classifications for reference only. Please consult the appropriate agencies for requirements and test qualifications for complete information.


Saginaw Industry Standards

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On each part number you will find the Industry Standards IS1 through IS11 indicating the specific Industry Standards that apply to the specific part.

IS1 - Industry Standards
NEMA Type 12 and Type 13
UL Listed Type 12
CSA Type 12
IEC 60529 IP 55

IS2 - Industry Standards
NEMA Type 4, 12 and Type 13
UL Listed Type 4 and 12
CSA Type 4 and 12
IEC 60529 IP 66

IS3 - Industry Standards
NEMA Type 3R, 12 and Type 13
UL Listed Type 3R and 12
CSA Type 3R and 12
IEC 60529 IP 55

IS4 - Industry Standards
NEMA Type 3R, 4, 12 and Type 13
UL Listed Type 3R, 4 and 12
CSA Type 3R, 4 and 12
IEC 60529 IP 66

IS5 - Industry Standards
NEMA Type 4, 4X, 12 and Type 13
UL Listed Type 4, 4X and 12
CSA Type 4, 4X and 12
IEC 60529 IP 66

IS6 - Industry Standards
NEMA Type 3R, 4, 4X, 12 and Type 13
UL Listed Type 3R, 4, 4X and 12
CSA Type 4, 4X and 12
IEC 60529 IP 66

IS7 - Industry Standards
NEMA Type 3R
UL Listed Type 3R
CSA Type 3R
IEC 60529 IP 32

IS8 - Industry Standards
NEMA Type 1
UL Listed Type 1
CSA Type 1
IEC 60529 IP 30

IS9 - Industry Standards
UL Component Recognized
CSA Component Recognized

IS10 - Industry Standards
UL Component Recognized

IS11 - Industry Standards
UL Component Recognized Type 3R

Special instructions apply for IS3, IS4 and IS6 to maintain the environmental rating of Type 3R for these parts. Instructions are located on the enclosure door. Drip shield is required on IS3, drip shield is recommended on IS4 and IS6. Drain holes are required on all.


Hammond Disconnect Selection Guides

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Hammond's disconnect enclosures provide ready-made and cut inserts for many types of disconnects from ABB Controls, Allen Bradley, Cutler Hammer, General Electric, Siemens I-T-E Max-FlexT, Square D. Choosing the right enclosure requires the right disconnect, so below are some helpful guides to aid in choosing the right disconnect enclosure:




Hammond Series 2000 Modular Enclosure Assembly Information

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The Series 2000 Modular Console System offers designers numerous assembly and configuration choices. This system allows units to be "stacked" in multiple combinations to provide equipment support and display functions exactly where you want them.


Series 2000 Modular Console Configurations



How to Configure Your System:
Please use the following steps to configure your system.
STEP 1 - Protection requirements
  Type 12 beige textured = "2CR." part numbers
Type 4 grey smooth = "2CP." part numbers
Type 4X stainless steel = "2CS." part numbers
STEP 2 - Width requirements (24, 36, 48, 60 inch)
STEP 3 - Basic component requirements:
  Bottom - (a) base, (b) dual access base, or (c) pedestal
Top - (a) standard desk and desk cover, (b) deep desk and desk cover, (c) standard turret, (d) deep turret, (e) standard desk/turret combination, (f) deep desk/turret combination, (g) another base and base cover, or (h) data terminal
Stand Alone - Consolet
STEP 4 - External Accessories (if applicable): plinth, footrest, window doors or depth extension
STEP 5 - Internal Accessories (if applicable): electrical mounting panels, electronic mounting rails, swing frames, etc.


Sources of Standards

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National Electrical Manufacturers Association
www.nema.org
NEMANational Electrical Manufacturers Association
  • 1300 N.17th St., Suite 1752, Arlington, VA 22209
Underwriters Laboratories Inc.
www.ul.com
ULUnderwriters Laboratories Inc.
  • 2600 N.W. Lake Rd., Camas, WA 98607-8542
Canadian Standards Association
www.csa.ca
CSACanadian Standards Association
  • 5060 Spectrum Way, Suite 100, Mississauga, Ontario L4W 5N6 CANADA
Joint Industry Council c/o AMT - The Association for Manufacturing Engineering
www.amtonline.org
JICJoint Industry Council c/o AMT - The Association for Manufacturing Engineering
  • 7901 Westpark Dr., McLean, VA 22101
Electronic Industries Alliance
www.eia.org
EIAElectronic Industries Alliance
  • 2500 Wilson Blvd. # 310, Arlington, VA 22201-3834




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