Okay, let's break this down. The short answer is: No, not all fittings in a Class 1, Division 2 area need to be explosion-proof (EP).

Here's a more detailed explanation based on common code interpretations (primarily based on US NEC - National Electrical Code): Class 1, Division 2 Fundamentals

In a Class 1, Division 2 area, ignitable concentrations of flammable gases, vapors, or liquids are not normally present in explosive concentrations. They are present only under abnormal conditions (e.g., a spill, a leak, or equipment malfunction). This is a key distinction from Division 1.

Acceptable Wiring Methods for C1D2 (simplified)



Rigid Metal Conduit (RMC)

This is a very common and robust choice.

Rigid Nonmetallic Conduit (RNC)

Can be used if suitable for the environment.

IMC (Intermediate Metal Conduit)

Another valid choice.

Type MC Cable

With listed gas/vaportight fittings.

TC-ER

If permitted for use in the environment.

Explosion-Proof vs. Suitable for Class 1, Division 2

The crucial point is that while

equipment containing arcing or heat-producing devices must be suitable for Class 1, Division 2 (meaning designed to prevent ignition of surrounding atmosphere under normal and abnormal conditions of the equipment itself), the conduit system doesn't necessarily need to be explosion-proof throughout the entire run. It needs to be suitable for the environment and provide a continuous, mechanically sound, and electrically continuous path to ground (if metal conduit). Seal-Offs are Critical

Your mention of seal-offs is the key here. Seal-offs are required:

To prevent the passage of gases, vapors, or flames from one portion of the electrical installation to another through the conduit where the conduit system enters or leaves a classified area. This is why you have them at the boundary. Within 18 inches of enclosures that contain arcing, sparking or high temperature components. This isolates the hazardous environment. Fittings



Standard Fittings (like "T"s, LR, LL)

In general, standard threaded fittings are permitted in C1D2 areas as long as they are part of a properly installed and sealed conduit system that is appropriate for the environment (e.g., corrosion resistance). They do NOT have to be explosion-proof if they don't contain devices that arc, spark or produce heat.

Exception

If a fitting itself contains a component that could be an ignition source (e.g., a terminal block in a junction box inside the fitting), then that fitting would need to be listed for Class 1, Division 2.

Material

Make sure your fittings are compatible with the conduit material (e.g., use galvanized fittings with galvanized RMC). Consider corrosion resistance if the environment warrants it.

Cat 6a Cabling



Cabling Concerns

The biggest concern is where the connection point for the Cat 6a cable is.

Connection Point

If the connection point (the physical RJ45 jack and where the conductors are terminated) is inside an enclosure, then that enclosure needs to be appropriately rated for Class 1, Division 2. This is extremely critical! You can't just have a standard RJ45 jack exposed to the C1D2 environment.

Cable Type

The cable itself should be suitable for the environment. For example, if the area is wet or corrosive, use a cable with appropriate jacketing.

Penetrations

Any penetrations into the enclosure must be properly sealed using appropriate fittings listed for the cable type and the hazardous location.

Access Points (APs)

The entire access point enclosure must be listed for Class 1, Division 2 if it is located within the classified area. You can't just use a regular AP and add a seal-off.

In summary


The conduit system (including most fittings) in a Class 1, Division 2 area does NOT need to be explosion-proof unless those fittings contain arcing or heat-producing devices.2. The conduit system MUST be properly sealed with seal-offs as required by code (at the boundary of the classified area and within 18 inches of enclosures with arcing, sparking or high temperature components).3. The conduit system must be suitable for the environment.4. Any enclosures containing devices that could be ignition sources MUST be listed for Class 1, Division 2.Recommendations



Consult the NEC (or your local electrical code)

Always refer to the latest edition of the applicable electrical code. Article 500 and related articles cover hazardous locations.

Consult with a Qualified Professional

Engage a qualified electrical engineer or hazardous location specialist to review your design and ensure compliance. This is crucial for safety.

Documentation

Thoroughly document your installation, including product specifications, certifications, and installation details.

Manufacturer's Instructions

Always follow the manufacturer's installation instructions for all equipment and fittings.

Disclaimer: I am an AI and cannot provide definitive engineering or legal advice. This information is for general guidance only. You must* consult with qualified professionals to ensure your installation meets all applicable codes and safety requirements. Incorrectly installed equipment in a hazardous location can have catastrophic consequences. Flag for review