Oct. 20, 2023

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A local control station (LCS) is an integral part of industrial control systems that allows operators to manage and control equipment and processes in hazardous or explosive environments. When choosing an explosion-proof LCS, safety and compliance are paramount. In this buying guide, we'll explore key factors to consider when purchasing explosion-proof local control stations.

 

1. Understand Hazardous Area Classification 

Explosive or hazardous areas are classified based on the type and frequency of flammable materials present. The classification, typically done in accordance with standards like the National Electrical Code (NEC) or the International Electrotechnical Commission (IEC), determines the level of protection required for LCS. Identify the specific hazardous area classification where the LCS will be installed, whether it's a Class I, II, or III location, and Division/Zone classification.

 

2. Compliance with Safety Standards

Safety standards and certifications are crucial when selecting an explosion-proof LCS. Ensure that the LCS complies with relevant international standards such as:

 

UL (Underwriters Laboratories) 1203: A common standard for explosion-proof and dust-ignition-proof electrical equipment in North America.

 

ATEX Directive: Applicable in the European Union for equipment used in potentially explosive atmospheres.

 

IECEx: An international certification system for explosive atmospheres, recognized in multiple countries.

 

Check that the LCS is appropriately labeled with these certifications to guarantee it meets safety requirements.

 

3. Enclosure Type and Material

The enclosure of an explosion-proof LCS must be robust and durable. Consider the following:

 

Material: Enclosures are typically constructed from materials such as aluminum or stainless steel, which are corrosion-resistant and suitable for harsh environments.

 

Type: The LCS should have an enclosure that meets the required protection level. Common types include NEMA 7 for Class I, Division 1 areas and NEMA 4X for Class I, Division 2 areas.

 

Gasket Seals: Ensure that the LCS has effective gasket seals to maintain the integrity of the enclosure, protecting it from the entry of hazardous materials.

 

4. Operating Temperature and Environmental Conditions 

The LCS must withstand the environmental conditions of the hazardous area. Factors to consider include:

 

Operating Temperature: Ensure the LCS is rated for the expected temperature range within the hazardous area. Some environments may require heaters or coolers to maintain the proper temperature.

 

Dust and Moisture Resistance: If the area is prone to dust or moisture, the LCS should have appropriate protection.

 

Impact Resistance: In areas with potential for impact, look for an LCS with the necessary impact protection ratings.

 

5. Component Configuration and Customization 

LCS units often have various components, such as switches, indicators, and terminals. Depending on the specific control needs of your application, consider:

 

Component Types: Choose components like push buttons, pilot lights, motor starters, or selector switches that match the control requirements.

 

Customization: Some LCS providers offer customization options to tailor the component configuration to your needs.

 

Spare Capacity: Ensure there is spare capacity for future expansion or additional controls.

 

6. Cable Entry and Conduit Options 

Cable entry and conduit options play a significant role in maintaining the integrity of the enclosure. Evaluate:

 

Cable Entry Types: The LCS should provide multiple cable entry options, including threaded hubs or conduit openings, to accommodate different conduit sizes and cable types.

 

Conduit Sealings: Verify that the conduit sealings are included and suitable for the hazardous area classification.

 

Conduit and Cable Clamping: Look for options to securely clamp and strain relieve conduits and cables to prevent damage and maintain safety.

 

7. Ease of Installation and Maintenance 

Consider the ease of installation and maintenance for the LCS:

 

Mounting Options: LCS units can be wall-mounted, floor-mounted, or integrated into control panels, so choose the installation method that suits your setup.

 

Accessibility: Ensure that the LCS provides easy access for maintenance without compromising safety.

 

Labeling: Clear and durable labeling of components and wiring simplifies both installation and maintenance.

 

8. Local Regulations and Inspections 

Local regulations may impact the use of explosion-proof LCS. Be aware of any specific requirements and ensure that the LCS complies with them. Periodic inspections by certified personnel may also be mandatory for safety and compliance.

For more information, please visit explosion proof panels.

 

9. Price and Warranty 

While cost is a factor, prioritize safety and compliance over price. High-quality, certified LCS units may come at a higher initial cost but offer long-term safety and reliability. Additionally, check the warranty offered by the manufacturer, as it can provide added assurance of the product's durability and performance.

 

10. Technical Support and Service 

Choose a reputable manufacturer or supplier with a history of providing quality products and good customer service. Knowledgeable technical support and readily available service and replacement parts can be crucial for maintaining your explosion-proof LCS.

 

In conclusion, selecting an explosion-proof local control station involves understanding hazardous area classifications, ensuring compliance with safety standards, considering enclosure materials and protection levels, assessing environmental conditions, customizing component configuration, evaluating cable entry options, ease of installation and maintenance, adhering to local regulations, considering price and warranty, and choosing a supplier with reliable technical support and service. By taking these factors into account, you can confidently select the right LCS for your hazardous area control needs.

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ATEX, FM, CE, UL, CSA explosion proof questions

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ATEX, FM, CE, UL, CSA explosion proof questions

ATEX, FM, CE, UL, CSA explosion proof questions

ScottAW

(Mechanical)

(OP)

9 May 06 09:29

I'm hoping a few of the more experienced safety code fellows can lend some insight here.  My company and I are trying to get an understanding of what the cost will be for us to get approval from ATEX, FM, CE, UL, and CSA for an electro-mechanical device to be used in an explosive environment.  By explosive, I am talking about an environment where there is high potential in the air, like a powder coating environment where the charges can reach upwards of 150 kilovolts.  Before we proceed with our designs, it's important that we understand what kind of finanical burden there will be to gain some of these approvals.

Any help appreciated.  Rough dollar amounts, links, suggestions, books to read up on this, etc.

RE: ATEX, FM, CE, UL, CSA explosion proof questions

4

Cster

(Mechanical)

8 Jun 06 23:27

Please note, without even knowing about your product other than its an electro-mechanical device, (motor, relay, switch, solinoid?, etc. don't know.), you are asking for certification from 4 different test houses, (UL, CSA, FM, & Some European Notified Body for ATEX certification).  

CE is a self declaration, where you are declaring your product complies with all applicable European directives, (i.e. Machinery directive, ATEX directive, EMC Directive, Low Voltage directive, Pressure directive, etc.).  

You mentioned the word ATEX, which is a European certification that is the dual of a Hazardous Locations Type certification.  You can do a one stop shop thing with UL as they do offer ATEX type certification through their European subsiderary UL International DEMKO in Denmark, who they own.  FM and CSA have a similar arrangement, through a company in the Netherlands called KEMA, but they don't own KEMA.  But you don't have to go though these channels.  Go to

Without pulling any punches, you should expect to pay some money and it may take a little time depending on everything that has to be done in testing and certifying.  

There are a lot of certification options out there for you, so you are going to have to provide a lot more details.  I could go on and on asking you things.  Do you know the standards or type of certification you are after?  

It looks like your product is going to operate in a Hazardous Location.  You need to determine the Classes, Groups and Divisions or Classes, Groups and Zones you'd like to have you product evaluated for.  Pick up the National Electrical Code and examine Article 500, Special Occupancy, Hazardous Locations.  This will help you with the domestic US certifications.  For the Canadian stuff you'll need to examine the Canadian Electrical Code.  Also note, for domestic certifications, you are going to have to comply with the applicable ordinary location requirements for your product.    

You are going to have to give more information, however, in order to get a more meaningful answer.  To give you a feel, though you should be really invested in this product if you plan to go for the whole shot like you have asked for.  It may benifit you to look at getting the certifications you are after in phases.  While contacting the test houses may be of some benifit to you at this time, please know they will push for a project to cover the time they will spend consulting you and examining you product.  As a courtesy they will provide you with a free quote and spend a little time talking to you and answering your questions, but don't expect very much of this.  So, you should do as much research, design, and testing of your product up front.  When you are ready to involve them be ready to tell them exactly what you want so as to make the process run much smoother.     

I hope this helps you.

ScottAW,Please note, without even knowing about your product other than its an electro-mechanical device, (motor, relay, switch, solinoid?, etc. don't know.), you are asking for certification from 4 different test houses, (UL, CSA, FM, & Some European Notified Body for ATEX certification).CE is a self declaration, where you are declaring your product complies with all applicable European directives, (i.e. Machinery directive, ATEX directive, EMC Directive, Low Voltage directive, Pressure directive, etc.).You mentioned the word ATEX, which is a European certification that is the dual of a Hazardous Locations Type certification. You can do a one stop shop thing with UL as they do offer ATEX type certification through their European subsiderary UL International DEMKO in Denmark, who they own. FM and CSA have a similar arrangement, through a company in the Netherlands called KEMA, but they don't own KEMA. But you don't have to go though these channels. Go to www.europa.eu to find a list of all European test houses who are designated as "Notified Bodies", capable of issuing product certifications in accordance with the ATEX directive 94/9/EC. For ATEX certification you very well likely could need a Production Quality Assurance Notification, PQAN. This has to do with your quality system and how you consistantly replicate the production of ATEX Certified products. This will be a separate cost to initiate and maintain. Here it will greatly help you if you have a ISO 9000 (1) quality system in place. If you don't have one in place than its going to cost you a little more up front and the expiration period, or need for reassessment will be more frequent, (possibly every year as opposes to once every 3 years if you have ISO 9000).Without pulling any punches, you should expect to pay some money and it may take a little time depending on everything that has to be done in testing and certifying.There are a lot of certification options out there for you, so you are going to have to provide a lot more details. I could go on and on asking you things. Do you know the standards or type of certification you are after?It looks like your product is going to operate in a Hazardous Location. You need to determine the Classes, Groups and Divisions or Classes, Groups and Zones you'd like to have you product evaluated for. Pick up the National Electrical Code and examine Article 500, Special Occupancy, Hazardous Locations. This will help you with the domestic US certifications. For the Canadian stuff you'll need to examine the Canadian Electrical Code. Also note, for domestic certifications, you are going to have to comply with the applicable ordinary location requirements for your product.You are going to have to give more information, however, in order to get a more meaningful answer. To give you a feel, though you should be really invested in this product if you plan to go for the whole shot like you have asked for. It may benifit you to look at getting the certifications you are after in phases. While contacting the test houses may be of some benifit to you at this time, please know they will push for a project to cover the time they will spend consulting you and examining you product. As a courtesy they will provide you with a free quote and spend a little time talking to you and answering your questions, but don't expect very much of this. So, you should do as much research, design, and testing of your product up front. When you are ready to involve them be ready to tell them exactly what you want so as to make the process run much smoother.I hope this helps you.

RE: ATEX, FM, CE, UL, CSA explosion proof questions

ScottAW

(Mechanical)

(OP)

9 Jun 06 08:34

Cster -

Thanks for the in-depth insight you provided!

I was able to gather some information, including a rough quote, for our project.  Turns out that for all of the above certifications that were desireable to have it would be a 30-40k expense, which was quite a bit higher than we expected, but not completely unexpected as it's a lot of time and effort to test for the various certs.

The particular environment we were looking at is basically a painting environment where the paint guns use a high voltage drop relative to the body that is being painted to bond the pain on. (simple description)  For products used in this environment, it is very important that they are explosion proof in such as way that they do not cause any electrical shorts and arcing issues.

Appreciate the time you took to explain the various agencies, it will be useful for future encounters! :)

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