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INTRODUCTION

Purpose

• Understand electrical enclosure standards & ratings

Objectives

• Learn how to identify potential enclosure use environments

• Understand the different rating & certification systems

Learning Time

• 15 minutes

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PROTECT FROM THE ELEMENTS

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Industrial automation equipment can be used in almost any environment imaginable. Enclosures must protect critical components from harmful elements to extend their life and prevent expensive operations downtime.

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UNDERSTANDING ENCLOSURE ENVIRONMENTS

1. UNDERSTAND THE ENVIRONMENT IN WHICH ENCLOSURES ARE TO BE USED

• Identify indoor or outdoor • Identify potential

contaminants

2. SELECT THE RATING BASED ON LOCATION AND USE ENVIRONMENT

• Select the Type or IP rating necessary to provide the protection required in the environment

3. SELECT THE ENCLOSURE AND MATERIAL WITH THE PROPER RATINGS

• Select the best solution platform that is ratings compliant

Understand the use environment, select the right enclosure 3

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Understand environment to select the right enclosure

INDUSTRIAL ENCLOSURE ENVIRONMENTS WHAT TO ASK WHEN CLASSIFYING AN INDUSTRIAL ENCLOSURE ENVIRONMENT

WATER, OIL OR LIQUIDS

Does the enclosure need to protect against water, oil or other liquids?

INDOOR OR OUTDOOR

Is the enclosure intended to be located indoors or outdoors?

DUST, DIRT OR SOLIDS

Does the enclosure need to protect against dust, dirt or other solid contaminants?

FALLING OR FORCED

Is the solid or liquid contaminant falling or being forced into the enclosure?

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Commonly recognized industry standards for protection ratings

INDUSTRY STANDARDS ORGANIZATIONS

CSA – CANADIAN STANDARDS ASSOCIATION

CSA Standard C22.2

NEMA – NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION

NEMA Standards Publication 250 – Enclosures for Electrical Equipment

UL – UNDERWRITERS LABORATORIES INC.

UL 50 – Enclosures for Electrical Equipment

UL 508A – Industrial Control Panels

IEC – INTERNATIONAL ELECTROTECHNICAL COMMISSION

IEC 60529 – Classification of Degrees of Protection Provided by Enclosures

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Significant differences between industry standards

INDUSTRY STANDARDS COMPARISON

CSA – CANADIAN STANDARDS ASSOCIATION

• Testing in certified

laboratory

• Inspections to ensure compliance

• Specifies construction and performance requirements

NEMA - NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION

• Manufacturer

self-declared

• Specifies construction and performance requirements

UL – UNDERWRITERS LABORATORIES INC.

• Testing in certified

laboratory

• Inspections to ensure compliance

• Specifies construction and performance requirements

IEC – INTERNATIONAL ELECTROTECHNICAL COMMISSION

• Manufacturer

self-declared

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NEMA, UL, & CSA RATINGS NORTH AMERICAN TYPE RATINGS SIMILAR ACROSS NEMA, UL AND CSA

Identify enclosure type rating by evaluating use environment

TYPE RATING

INDOOR/ OUTDOOR

PROTECTION FROM TYPICAL APPLICATIONS

TYPE 1 Indoor • Incidental personal contact • Dust and falling dirt

• Climate controlled indoor shelters • Low contamination electrical rooms • Offices and warehouses

TYPE 12 Indoor • Incidental personal contact • Dust and falling dirt • Dripping non-corrosive liquid

• Indoor security and fire applications • Light industrial facilities

TYPE 3R Outdoor • Incidental personal contact • Rain, snow and sleet

• Wireless telecommunications • Outdoor utilities

TYPE 4 Indoor/Outdoor • Incidental personal contact • Dust and falling dirt • Windblown dust and fibers • Hosedown / splashed water

• Cement plants • Outdoor plants • Rubber tire manufacturing • Industrial plants

TYPE 4X Indoor/Outdoor • Incidental personal contact • Dust and falling dirt • Windblown dust and fibers • Hosedown / splashed water • Corrosive agents

• Marine applications • Wastewater treatment facilities • Food and beverage processing plants • Pharmaceuticals and cleanrooms • Petroleum and chemical processing

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INGRESS PROTECTION RATING COMMONLY USED WORLDWIDE OUTSIDE NORTH AMERICA

IEC/IP RATING SYSTEM

I P

Protection against Solid Objects 0 - 6

Protection against Liquids 0 - 8

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IEC/IP ratings cannot be directly compared to NEMA/UL/CSA 8

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IP RATING

PROTECTION FROM SOLIDS

PROTECTION FROM LIQUIDS

TYPICAL APPLICATIONS

IP20/IP30 • Objects 12mm/ 2mm in diameter

• No protection • Climate controlled indoor shelters • Low contamination electrical rooms • Offices and warehouses

IP54/IP55 • Dust (limited ingress) • Water spray • Low pressure jets

• Indoor security and fire applications • Light industrial facilities

IP66 • Dust (no ingress) • Strong water jets • Petroleum and chemical processing • Wastewater treatment facilities • Pharmaceuticals and cleanrooms

IP69K • Dust (no ingress) • High temperature • High pressure water jets

• Food and beverage processing

IEC/IP RATING SYSTEM

Identify enclosure IP rating by evaluating use environment 9

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CHOOSING INDUSTRIAL ENCLOSURE MATERIALS

Environmental ratings a primary factor in material selection

TYPE 1 TYPE 12 TYPE 3R TYPE 4 TYPE 4X

IP20/IP30 IP54/55 IP66 IP69K

MILD STEEL

MILD STEEL MODULAR

STAINLESS STEEL

NON-METALLIC

ALUMINUM

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HOFFMAN TESTING & CERTIFICATION CAPABILITIES

COMPLETE IN-HOUSE, GLOBAL TESTING CAPABILITY ENSURES FULL COMPLIANCE WITH ALL INDUSTRY STANDARDS

Hoffman has an onsite UL & CSA Certified Laboratory 11

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SUMMARY

THINGS A DESIGN ENGINEER NEEDS TO KNOW

1) How to classify an industrial automation enclosure use environment

2) Different standards for industrial automation enclosures

3) NEMA or UL Type ratings and their meaning

4) IP ratings and their meaning

5) Where typical Type or IP ratings are used

6) How to select an enclosure material to meet the rating required

7) Hoffman’s extensive testing and certification capabilities

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Understand the environment, select the right enclosure