Okay, let's break down the situation and the relevant NEC (National Electrical Code) considerations.

The Problem

You have PVC conduits stubbing out of a concrete wall very close together, and you need to connect them to a gutter box (wiring trough). The conduits are so close you can't fit standard PVC couplings onto them to properly enter the gutter box.

NEC Considerations and Possible Solutions


NEC 314.40(D) and 314.17(C) - Raceway or Cable Entries

These are the key sections you need to be aware of. They address how raceways (like your PVC conduit) must enter boxes and enclosures (like your gutter box).

The gist

The NEC generally requires that raceways be securely fastened to boxes and enclosures. This is to provide mechanical support, prevent strain on conductors, and maintain the integrity of the wiring system. You can't just have conduits floating loosely into the box.2.

NEC 314.17(C) Exception (3) - Openings Without Fittings

This exception offers a possible out, but it has very specific conditions that must be met. It's for situations where you might not need a traditional connector. Let me outline the requirements:

(3)(a) - Raceway is securely fastened

The raceway must be securely fastened within 3 feet of the enclosure.

(3)(b) - Raceway is terminated in a busway or auxiliary gutter

This does NOT apply in your situation.

(3)(c) - Raceway is terminated in a surface metal raceway

This does NOT apply in your situation.3.

Cutting a Square Hole

This is generally not a code-compliant solution if it leaves the raceway unsupported and does not provide a secure connection to the gutter box. Cutting a large square hole also weakens the enclosure, and likely voids the enclosure's listing.

Therefore, here's a breakdown of options and recommendations



Preferred - Find a way to use listed fittings

This is always the best practice for ensuring compliance and safety.

Compact Connectors

Explore very short, low-profile PVC connectors or adapters. There are some that are specifically designed for tight spaces. Search online for "short PVC conduit connector" or "low profile PVC conduit fitting." A trip to a well-stocked electrical supply house is recommended.

Offset Nipples

You could use a short piece of conduit ("nipple") with a slight offset bend in it to move the conduit just enough to allow a connector.

Enlarge the Gutter Box Entry

Carefully consider if you can enlarge the holes in the gutter box just enough to accommodate connectors. Do not compromise the structural integrity of the gutter box.

Option Using NEC 314.17(C) Exception

You might be able to use the exception if you can securely fasten the conduits within 3 feet of the gutter box to the concrete wall. But it must be a REALLY GOOD fastening that will not move. The exception is intended for scenarios where the raceway is truly rigidly supported on its own. This is a grey area, and an inspector might still reject it. The other condition must also be met.

Cutting a square hole is NOT recommended

This is very unlikely to meet code, compromises the enclosure, and is generally a bad practice.

Key Recommendations



Consult Your Local Inspector

The best advice is to consult with your local electrical inspector before you do anything. Explain the situation and ask what they will accept. They have the final say, and their interpretation of the code is what matters.

Use Listed Products

Always use electrical materials that are listed and labeled by a recognized testing laboratory (e.g., UL, ETL).

Proper Support

Ensure that all conduits are properly supported and secured. This is crucial for the long-term safety and reliability of your electrical system.

Documentation

Keep a record of any code interpretations or approvals you receive from the inspector.

In summary, while cutting a square hole might seem like the easiest solution, it's likely not code-compliant. Prioritize finding a way to use approved connectors or, as a last resort, explore the possibility of using the exception in 314.17(C) if you can meet all the requirements. Always consult with your local inspector to ensure compliance. Flag for review