You're right, good, clear images of PVC duct banks terminating inside concrete manholes can be surprisingly difficult to find online! Here's a breakdown of common practices based on my knowledge and research

1. Termination Fittings (End Bells, Bushings, or Connectors):
Generally, Yes, you should use a termination fitting. It's best practice for several reasons: Protection

Fittings, especially end bells or bushings, protect the cables being pulled through from abrasion against the rough concrete edge. Concrete can be very abrasive.

Cable Bending Radius

Some fittings help maintain the proper bending radius of the cables as they transition from the conduit into the larger space of the manhole.

Sealing (Sometimes)

While not always required, some fittings can provide a degree of sealing to prevent water or debris from entering the conduit system from the manhole. This is especially important if the manhole is prone to flooding.

Identification

If the conduit system runs are not obvious from a visual inspection, labeling at the termination point can be beneficial for future work and system maintenance.

Common Fittings



End Bells

These are flared fittings that provide a smooth, rounded entrance for cables. They're a good choice when pulling large or sensitive cables.

Conduit Bushings

Simpler and often less expensive than end bells. They provide a smooth, rounded edge to protect cables.

PVC Adapters/Connectors

Used to transition from the PVC conduit to a different type of fitting or to provide a secure connection to the manhole wall, especially if using a specific type of sealant.

Why you might see "flush cut" in some unclear images



Poor Installation

Unfortunately, not all installations follow best practices. A flush cut might indicate a shortcut taken during installation.

Retrofits/Repairs

Sometimes, during repairs, a damaged fitting might be removed and not replaced immediately, leaving a flush cut.

Photo Quality

Low-resolution or poorly lit photos can make it difficult to discern whether a fitting is present.

2. Opening Shape (Window vs. Individual Holes)



Individual Holes

This is more common, especially for smaller duct banks. Each conduit has its own dedicated hole through the manhole wall.

Pros

Simpler to form during manhole construction. Can provide better individual support for each conduit. Easier to seal each penetration.

Cons

Can be more time-consuming to install the conduits precisely.

"Window" Opening (Larger Opening for Multiple Conduits)

This is used for larger duct banks, where many conduits enter the manhole at the same point.

Pros

Easier to form during manhole construction. Easier to install multiple conduits simultaneously.

Cons

Requires more careful planning to ensure proper spacing and support for each conduit within the window. Sealing can be more challenging. You'll likely need some kind of duct spacer/separator block inside the manhole where the conduits exit. Cable bending radius can be a concern if the window is too small or the conduits are too close together.

Important Considerations for Both Scenarios



Spacing

Proper spacing between conduits is critical for heat dissipation and ease of cable pulling.

Support

The conduits must be adequately supported both inside and outside the manhole to prevent sagging or damage. Consider using duct spacers in the manhole.

Sealing

Regardless of the opening shape, it's important to seal the penetrations around the conduits to prevent water ingress and maintain the integrity of the manhole. Use a duct seal or mastic around the point where it penetrates the manhole wall.

Code Compliance

Always follow local electrical codes and industry best practices when designing and installing duct banks and manholes.

Cable Fill

Make sure that the cable fill does not exceed the NEC standards for each conduit.

Where to Look for Better Images



Engineering Firms

The websites of civil and electrical engineering firms that specialize in underground utilities often have project portfolios with detailed photos.

Utility Companies

Search the websites of local power and telecommunications companies. They sometimes have resources or case studies showing their infrastructure.

Construction Material Suppliers

Check the websites of companies that manufacture and sell duct bank materials (conduit, fittings, spacers, etc.). They might have installation guides or product photos.

Technical Manuals

Look for engineering manuals or textbooks on underground utility construction. They often have detailed diagrams.

Try Different Search Terms: Use variations of your search terms: "PVC conduit termination manhole" "Underground duct bank manhole" "Electrical manhole conduit entry"* "Utility vault conduit termination"While I can't provide a specific perfect image, understanding these principles will help you interpret any pictures you find and ensure you're following best practices. Flag for review