Okay, I understand your question. You're interpreting a section (which you haven't provided, but I'll address in general terms) about transition fittings and wondering if it could be used to justify using these fittings as a pulling point for electrical conductors, particularly when incorporating a flexible section for expansion.

Here's a breakdown of why this is generally a very bad idea and why I doubt the code section allows it, even if it seems to imply it



Transition Fittings are Not Designed for Pulling Forces

Transition fittings, especially those used to connect rigid conduit to flexible conduit (like Sealtight or liquidtight flexible metal conduit), are primarily designed to: Provide a secure and environmentally protected connection between different types of conduit. Maintain grounding continuity. Provide a smooth transition to prevent damage to conductors during normal operation.They are

NOT typically designed to withstand the significant axial pulling forces exerted when pulling conductors through a long conduit run. Potential for Fitting Failure

Attempting to use a transition fitting as a pull point can lead to several problems:

Damage to the Fitting

The fitting could crack, break, or become distorted under the pulling force. This could compromise the integrity of the conduit system, create a shock hazard, and invalidate the UL listing of the fitting.

Separation

The fitting could separate from either the rigid conduit or the flexible conduit, causing the conductors to bind or become damaged inside the conduit.

Damage to the Conductors

The sharp edges or internal components of the fitting could damage the insulation of the conductors during pulling.

Compromised Seal

If the fitting is designed to be liquidtight or raintight, the pulling force could compromise the seal, allowing moisture to enter the conduit system.

Code Requirements Focus on Pull Boxes and Access

Electrical codes (like the NEC in the US) require the use of pull boxes, junction boxes, or conduit bodies at specific intervals in a conduit run to facilitate the pulling of conductors. These boxes are specifically designed to provide access and withstand pulling forces. The code also specifies maximum pulling tensions for conductors and conduit fill requirements, all of which are designed to protect the conductors and ensure a safe and reliable installation.

Expansion Joints and Flexible Conduit

While using flexible conduit as an expansion joint is a common practice, the flexible conduit itself is generally not the primary pull point for long runs. Instead, the flexible conduit is typically installed after the conductors have been pulled through the rigid conduit sections on either side. The flexible section is then used to accommodate movement or vibration after the conductors are in place.

Why Your Interpretation is Likely Incorrect (Without Seeing the Actual Section)

Even if the section mentions transition fittings, it's highly unlikely it's explicitly authorizing their use as pull points. Here's what the section might be addressing:

Listing and Suitability

The section might be emphasizing that transition fittings must be listed for their intended purpose (connecting different types of conduit) and suitable for the environment.

Installation Requirements

The section might outline proper installation methods for transition fittings, such as tightening torque requirements or the use of specific sealants.

Grounding and Bonding

The section might address the proper grounding and bonding of transition fittings to maintain electrical safety.

What You Should Do Instead


Use Approved Pull Points

Always use pull boxes, junction boxes, or conduit bodies as pull points. These are designed and listed for that purpose.2.

Pull Conductors in Sections

Break up long conduit runs into shorter sections with pull points in between.3.

Install Flexible Conduit After Pulling

Install the flexible conduit section after the conductors have been pulled through the rigid conduit sections.4.

Use Lubricant

Use an approved wire-pulling lubricant to reduce friction and pulling force.5.

Check Conductor Insulation

After pulling, inspect the conductors for any signs of damage to the insulation.

To get a definitive answer



Provide the exact text of the section you are referencing. This is crucial for proper interpretation. Consult with a qualified electrical inspector. They can provide guidance based on local codes and best practices.In summary, while using flexible conduit as an expansion joint is acceptable, using transition fittings as pull points is generally a bad idea because they are not designed to withstand the necessary pulling forces. Flag for review