Mike Dolt Enterprises Logo Mike Dolt Enterprises

Topic: LB with bonding screw?

User: solarken, Location: Hudson, OH, USA

Asked on: Wednesday, January 29, 2025 at 12:13 pm EST
Answered on: Thursday, March 6, 2025 at 7:59 am EST

Question: Any manufacturer make LB's with EGC binding screw inside for terminating wire-type EGC when transitioning from PVC conduit to EMT?

While I can't provide a definitive list of every manufacturer, the answer is likely yes, though they might not be exclusively marketed for transitioning from PVC to EMT. Here's why and what to look for: Purpose

The purpose of having an EGC binding screw in an LB fitting is to provide a reliable grounding point when transitioning from non-metallic conduit (like PVC) to metallic conduit (like EMT). This ensures that the EMT conduit system is properly grounded, maintaining a low-impedance path for fault current.


Terminology

Manufacturers might not explicitly label them as "LB's with EGC binding screw for transitioning from PVC to EMT." They'll likely be referred to as:

"Grounding LBs"
"Service Entrance LBs" (sometimes these have grounding provisions) "LBs with Grounding Lug" "Metallic Conduit Bodies with Grounding Screw" How to Find Them


Look at Manufacturer Catalogs & Websites

Major electrical manufacturers like
Arlington, Bridgeport, RACO, Thomas & Betts (ABB), Hubbell, Appleton, and others will have LB fittings in their catalogs. Look for product descriptions that specifically mention a grounding screw, lug, or provision for connecting a grounding conductor.2.

Use Online Retailer Filters

Online electrical supply retailers (e.g., Grainger, Platt Electric, Graybar, Amazon) often have filters that allow you to narrow down your search based on features like "Grounding Lug Included" or "Grounding Screw."3.

Check the Cut Sheets/Spec Sheets

Always download and review the cut sheet or specification sheet for a product before purchasing. These documents will provide detailed information about the fitting's features, including whether it has a grounding screw.4.

Look for UL Listing

Check that the LB fitting is UL listed (or ETL or other recognized testing laboratory). The listing mark indicates that the fitting has been tested and certified to meet safety standards, including grounding requirements.


Important Considerations



Material Compatibility

Ensure the LB fitting material (e.g., aluminum, steel) is compatible with both the PVC and EMT conduit.


Code Compliance

Always follow the National Electrical Code (NEC) and local electrical codes when installing and grounding electrical systems. Article 250 of the NEC covers grounding requirements.

Proper Installation

Ensure the grounding conductor is securely connected to the binding screw and that all connections are tight and clean.


Size

Make sure the LB fitting is the appropriate size for the conduit you are using.

In short: Look for metallic LB fittings with grounding screws or lugs in the product descriptions and spec sheets from reputable electrical manufacturers.
Flag for review

Previous Question Next Question