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Topic: Number of bends between pull points

User: kenaslan, Location: Billings MT

Asked on: Tuesday, February 4, 2025 at 7:22 pm EST
Answered on: Thursday, March 6, 2025 at 8:15 am EST

Question: There has been some discussion here and there on the maximum number of bends in any conduit run. I believe that we all agree that it is 360 degrees or 4 quarter bends. The code states "There shall not be more than the equivalent of four quarter bends (360 degrees total) between pull points, for example, conduit bodies and boxes." IMO The definition of a "pull point" is a box or conduit body with a removable cover. No removable cover, no pull point. There are some that suggest the idea that you can unscrew a FLMC connector and pull the wire then put it back together again meets the intent of the code. I believe that is wrong. The amount of bends in the FLMC MUST be added to the conduit run in order to get the correct number of bends. Once a box or conduit body is encountered we restart the count toward 360 degrees again. Has anyone found a NEC definition for "Pull Point"? Anyone for the Code Panel have any insights? I have a "constructability manager" with the responsibility is to build it as cheap as possible. They believe that because "pull point" is not defined in the code, they can define it any way they want.

You've hit upon a common point of contention in the electrical industry. Your understanding aligns with best practices and the general intent of the code, but the lack of a precise definition opens the door for (mis)interpretation. Let's break it down

Your Interpretation (Which is Correct in my Opinion):
360-Degree Limit

You correctly understand the fundamental rule: no more than 360 degrees of bends between pull points.


Pull Point Definition

You're on solid ground defining a pull point as a box or conduit body with a removable cover. This is key. The ability to easily access the raceway to facilitate pulling conductors is what makes it a pull point.

FLMC Bends

The bends in FLMC
absolutely count toward the 360-degree limit. The fact that it's flexible doesn't exempt it from contributing to pulling friction.

Restarting the Count

Correct again. Once you reach a box or conduit body with access, you reset the bend count.

Why Your Constructability Manager is Wrong (and Potentially Violating the Code in Spirit)



Misinterpreting the Lack of Definition

The
absence of a rigid definition doesn't grant free license to redefine well-understood terms. In the electrical trade, "pull point" has a very specific, practical meaning.

FLMC Connector as a Pull Point is Absurd

Un-screwing an FLMC connector is not a pull point in any reasonable sense. It's a connection, not a place designed for and easily used for pulling conductors. It compromises the integrity of the connection. Pulling and re-tightening connectors will almost always cause problems.

Ignoring Pulling Friction

The 360-degree rule isn't arbitrary. It's based on the physics of pulling conductors and managing friction. By cramming in more bends, they're risking:
Damaged conductors (nicks, scrapes, insulation damage) Exceeding the allowable pulling tension on the conductors Making future repairs or modifications extremely difficult or impossible.

The Problem: Lack of Explicit Definition in the NEC


You are correct. The NEC does not provide a specific definition of "pull point." This is a major weakness. It relies on the knowledge and expertise of the user to understand the intent and application of the rule.

Why This Matters (Beyond Code Compliance)



Safety

Damaged conductors can lead to shorts, ground faults, and fires. Overstressed conductors can fail prematurely.


Reliability

A poorly installed conduit system is prone to problems.

Maintainability

Making it difficult to pull conductors will increase the cost and time required for future repairs, upgrades, or replacements.


Liability

If a fire or electrical failure is traced back to a code violation (even a "gray area" violation), your company could be liable.

What You Can Do


Document Everything

Meticulously document your concerns in writing. Explain the reasoning behind your interpretation, citing the physics of pulling conductors and the potential negative consequences of exceeding 360 degrees.2.

Seek Clarification (Official Channel)



Official Interpretation Request

The formal way to get an official interpretation is through an "Official Interpretation Request" to the NFPA (the organization that publishes the NEC). This is a slow process, but it results in a formal opinion.


Local Authority Having Jurisdiction (AHJ)

Discuss the situation with your local electrical inspector or AHJ. Their interpretation is the one that matters most in your jurisdiction. Get their opinion in writing, if possible.3.

Focus on Best Practices

While you can't strictly prove your interpretation based on a definition, you can argue that it aligns with industry best practices and the intent of the code.4.

Calculate Pulling Tension

If possible, calculate the estimated pulling tension for the proposed conduit run, taking into account all bends (including the FLMC). If the tension exceeds the allowable limits for the conductor type and size, you have a strong argument against the design. Software like Accubend can calculate pulling tension.5.

"Value Engineering" vs. Cutting Corners

Explain the difference between genuine value engineering (finding smarter ways to achieve the same result) and simply cutting corners. Emphasize that compromising safety and reliability for short-term cost savings is not value engineering.6.

Escalate the Issue

If your documentation and arguments don't persuade your constructability manager, escalate the issue to a higher level of management, emphasizing the potential risks and liabilities.7.

Refuse to Participate in Unsafe Practices

If all else fails, and you believe the proposed installation is unsafe and violates the spirit of the code, be prepared to refuse to participate. Consult with an attorney if necessary to understand your rights and obligations.

In Conclusion:


You are on the right track. The lack of a clear definition of "pull point" is a problem, but it doesn't give license to ignore the fundamental principles of safe and reliable electrical installations. Stand your ground, document everything, and be prepared to escalate the issue if necessary. Safety and code compliance should always take precedence over short-term cost savings. Flag for review

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