Hello Anti-Copy Paste Engineer,

Before we start today's learning.

I want to share some good news.

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I used to feel junction boxes are so simple.

Some Cables come in.

Some Cables go out.

Do I really need to know anything about it?

But after reviewing 100’s of mistakes in Junction Box Datasheets.

Here is my experience

That could help you save time and Cost.

Here's what I check in a Junction Box Datasheet.

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1. Type of Junction Box

Core Requirements to Specify First, decide the overall type. How many pairs do you need?

Common choices are:

• 5 Pair
• 10 Pair
• 20 Pair

The same applies for triad cables.

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2. IP Rating Requirements

Where is the Junction Box installed? Your IP requirement changes with location.

Indoor vs. Outdoor:

• Indoor: Usually IP21 or IP54.
• Outdoor: Stricter ratings like IP65 or IP66.

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3. Select the JB Material

You have two main choices. Metallic vs. Non-Metallic.

• Non-Metallic: Usually made of GRP.
• Metallic: Commonly SS304 or SS316.

Pro tip: Watch out for corrosive site conditions. Harsh environments require painted metallic boxes.

Sounds crazy, but yes, sometimes you need to paint an SS316 junction box as well.

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4. Hazardous Area Requirements

Safety is the top priority. You must specify Exe, Exd, or Exi.

• Exd (Flameproof): Can contain an internal blast safely. Sparks stay inside the box.

• Exe (Increased Safety): Does not allow sparks

Further divided into:

1. Exeb
2. Exec

Pro tip: Remember Exe cannot contain an internal blast safely.

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In Which Zones Can We Use Exe?

The standard splits Ex e into two levels.

• Ex eb

Designed for Zone 1.

Also safe for Zone 2.

• Ex ec: Designed for Zone 2 only.

Common Question.

Short Answer: Yes, you absolutely can do this.

• It is a highly preferred industry practice.
• It is often called indirect entry.

Why do we do this?

• Ex d enclosures have heavy, bolted flanges.
• They are difficult and slow to open.
• Ex e JBs are lightweight and accessible.
• Maintenance becomes much faster and easier.

How does it work safely?

• The sparking component stays inside Ex d.
• The field wiring stays inside Ex e.
• You must seal the boundary between them.
• Use a certified Ex d barrier gland.
• Install it at the Ex d enclosure exit.
• Run the cable to the Ex e JB.
• Terminate using an Ex e cable gland.
• Connect wires to certified Ex e terminals.

In short for Exd Instrument Side use Exd glands and for Exe JB side use the Exe Gland.

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5. Upfront Share Terminal Specifications

Terminal Names must be defined

Like You want 1,2,S

or

You want 1,2,3.

Here “S” stands for Shield.

If your project needs 1,2,S.

And the vendor gives 1,2,3.

You are in a fix.

So upfront get it clarified.

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6. Define Shielding Requirement

• Shielding:

Do you want to Connect individual to overall shield.

This might require jumpers.

If you want it to be pre-wired (Please inform vendors).

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7. Specify Terminal Color and Type

Here's a guide on terminal Color

The Ex i Standard:

• The universal color is Light Blue.
• This is a strict industry standard.
• It screams "low energy circuit" instantly.

The Non - Ex i Standard:

• The standard color is usually Grey.
• Some vendors also use Black terminals.
• These handle higher, unsafe energy levels.
• Keep them away from blue terminals.

Protective Earth (PE)

• Always use Green-and-Yellow stripes.
• This applies to all junction boxes.
• They bond the shield to earth.
• They connect enclosures to plant ground

Terminal Types

Can be specified as screw, spring, or stud.

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8. Define the Cable Entry

Following configurations are available for cable entry:

• Bottom
• Top
• Side

PS: Common selection is usually Bottom entry or side entry.

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9. Specify the Earthing Requirement

Protective Earth (PE):

• Also called the body earth.
• It protects people from shocks.
• Connected to the metallic enclosure.
• Requires internal and external studs.

Signal Earth (SE):

• Also called the clean earth.
• It protects your delicate signals.
• Keeps noise out of 4-20mA.
• Overall cable shields connect here.

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Bus Bars and Continuity Plates (When to select what)

The Earthing Bus Bar:

• A solid copper collection point.
• Often isolated for signal earth.
• Gathers all shields to one place.

Pro tip: Don’t forget Continuity plate for GRP junction Boxes.

Since they are non-metallic.

The Continuity Plate:

• Crucial for non-metallic GRP boxes.
• Connects all cable glands together.
• Ensures a continuous earth path.
• Usually made of brass or copper.

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10. How is your junction box mounted?

Common Mounting Types are:

• Wall
• Pipe
• Structure

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11. Lifting Lugs in Junction Box

Especially Needed for heavy boxes.

This has to also be checked in the GA drawing of Junction Boxes.

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12. Specify Cable Glands

Typical Gland Sizes You have two main systems.

Metric Threads (ISO):

• The global standard for instrumentation.
• M20 is the most common.
• Used for single pair cables. M25 or M32 for multipair.
• Used for thicker home-run cables.
• Select Glands based on Cable O.D.

NPT Threads (Imperial):

• Standard for North American projects.
• 1/2" NPT matches M20 usually.
• 3/4" NPT for larger multipair.
• Tapered threads seal very tightly.

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13. Specify Plug Requirements

Spares entries are never left empty.

Common Materials:

• Use Polyamide Plugs during transport.
• Replace with metal (usually Nickel Plated Brass) for operation.

Pro tip: If your Junction Box is IP 66.

Then the plugs must also be certified.

Else you lose your IP protection of the Junction Box.

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14. Specify the Name Plate

It must show all critical details.

Here are a few details you must check out:

• The Tag Number: The unique plant identifier.
• Manufacturer Name: Exactly who built it.
• Year Built: For warranty and lifespan tracking.

If it is installed in a Hazardous Area: (Include Below)

➜ Ex Code: Shows the exact protection method.

Examples like Ex d IIC T4.

➜ The IP Rating: Shows water and dust protection.

Must match your datasheet spec.

➜ Operating Limits: Example Safe working environment range.

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ACV Cohort

Introducing ACV – Advanced Control Valve Cohort.

This is a program made for Busy Professionals wanting to quicky master control valves.

In this fast-track program you will master

• Valve Sizing Software

• Valve Selection & Engineering.

• Valve Material Selection.

• Valve Engineering Standards.

• Valve Datasheet preparation and GAD review.

Excited to learn.

You can join 800+ Engineers below

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#2- Engineering Standard

IEC 60079

Think of IEC 60079 like a massive umbrella.

It covers all explosive atmosphere rules globally.

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Further Segregation of IEC 60079

➜ IEC 60079-0: General Requirements

• This is the foundation of everything.

• All equipment must pass these tests first.

• It defines basic testing and marking rules.

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The Main Ex Types Explained

Let's break down the most common ones.

➜ IEC 60079-1: Ex d (Flameproof)

• It contains the explosion inside safely.

• It uses heavy, robust metal enclosures.

➜ IEC 60079-2: Ex p (Pressurization)

• It keeps hazardous gas completely outside.

• It flushes enclosures with clean air.

➜ IEC 60079-7: Ex e (Increased Safety)

• It prevents sparks from ever happening.

• It relies on high-quality terminal insulation.

➜ IEC 60079-11: Ex i (Intrinsic Safety)

• It limits the circuit energy completely.

• It cannot generate an igniting spark.

➜ IEC 60079-18: Ex m (Encapsulation)

• It traps the spark in solid resin. • It completely seals the electronic components.

➜ IEC 60079-31: Ex t (Dust Protection) • It is built specifically for combustible dust. • It relies on tight physical enclosure sealing

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#3 -Career Tip

The Number One Career Tip

The number one tip is simple. It has worked for decades.

➜ Provide Value first.

➜ Expect zero returns initially.

Most people get this completely backward.

• 95% want the promotion first.
• They want the money first.
• Then they offer true value.
• But this rarely ever works.

The Long-Term Payoff

Do this consistently for a year.

Opportunities will actively chase you.

You will hand-pick the best ones.

Try this in your daily life.

You will see absolutely insane results.

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How you can apply as an Engineer

Start by helping your team out.

• Review a colleague's Datasheet voluntarily.
• Find a recurring plant problem.
• Create a simple solution for it.

Share it with your manager directly.

Pro Tip : Don't ask for a raise immediately.

Just solve the engineering headache first.

Be the go-to person for solutions.

1. Fix that tricky Control Valve issue.
2. Explain the fix to your team.
3. You become undeniably valuable this way.
4. The promotions will naturally follow you.

This is far better strategy than just asking for a promotion.

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#4 - How I can help

Advanced Control Valve (ACV)

In this Cohort, you'll be able to :

• Independently Size Control Valves in software.

• Independently Select and make control valve datasheets.

• Independently Review Control valve TBT and GAD Drawings.

and gain expertise on this Most-demand skill without spending a huge amount of time (months or years reading books) or doing homework assignments, even if you have zero control valve experience before.

If interested in learning,

You can join the Advanced Control Valve list below.

800+ Engineers excited for ACV

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#5 - Rate Today's lesson

How was todays email lesson?

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Needs Serious Improvement

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Until next week,

Happy Learning and Keep Smiling.

Asad Shaikh

Your super passionate Control Valve Friend!!

See you next week!

​www.Asad-Shaikh.com​