Conduit Nipple Grounding Bushing with Integrated Lug and Insulator
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Solution Overview
Problem
There is a need for a conduit nipple that can be grounded and insulated to minimize electrical conductor chafing when used between electrical enclosures or between an electrical enclosure and a conduit body, while also providing secure connections and vibration reduction.
Innovation Solution
A conduit nipple grounding bushing with a body having mounting pads for a grounding lug, a snap-on insulator, and an insuliner, made from materials like zinc alloy and plastic, which includes serrations for bonding and vibration reduction, and features for secure connection through locknuts or threaded engagement, ensuring smooth conductor passage and proper grounding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conduit nipple is used to connect electrical enclosures, then electrical connections are established, but conductor chafing occurs due to lack of insulation
Solution Approach 1:
The snap-on insulator is a telescoping structure that nests over the conduit nipple body, with an inner telescoping portion that fits inside the body and an outer telescoping portion that extends outward to provide insulation. This nested design provides comprehensive conductor protection without adding significant external complexity.
Solution Approach 2:
The insulator is divided into distinct segments: a first end portion, an inner telescoping portion, and an outer telescoping portion. This segmentation allows each part to perform its specific function - the first end portion interfaces with the enclosure, the inner portion provides internal insulation, and the outer portion provides external insulation and vibration reduction.
2Reliability
If a grounding lug is added to the conduit nipple, then electrical grounding is achieved, but the device structure becomes more complex
Solution Approach 1:
The grounding lug is integrated directly into the conduit nipple body as a unified structure, with the lug formed as an extension of the body itself. The mounting pad is built into the body surface, eliminating the need for separate grounding components and simplifying the overall device structure while ensuring reliable electrical grounding.
3Stability of the object's composition
If serrations are added to the conduit nipple surface, then vibration reduction is achieved, but manufacturing complexity increases
Solution Approach 1:
Serrations are applied only to specific localized areas of the conduit nipple body - specifically on the first end portion where it interfaces with the electrical enclosure. This localized application provides vibration reduction at the critical connection point without requiring the entire surface to be serrated, thereby reducing manufacturing complexity.
4Object-affected harmful factors
If a snap-on insulator with multiple portions is used, then conductor protection is improved, but the device complexity increases
Solution Approach 1:
The snap-on insulator employs a nested telescoping design where the inner telescoping portion fits within the conduit nipple body and the outer telescoping portion extends outward. This nested structure provides multi-layered conductor protection (internal insulation, external insulation, and vibration reduction) while maintaining a compact form factor that minimizes added complexity.
Data Source
AI summary
A conduit nipple grounding bushing to connect between two electrical enclosures or an electrical enclosure and a conduit body, comprising a body having a first portion and a second portion forming a hollow cylindrical interior for the passage of conductors therethrough, the body having a first opening at a first end of the body and a second opening at a second end of the body, the first portion having an outer surface with one or more mounting pads along a circumferential area, each of said one or more mounting pads configured for receipt of a grounding lug, and an end surface dimensioned to contact an electrical box about a knockout hole thereof, and wherein the second portion has exterior threads configured to pass through a knockout hole of an electrical box and dimensioned for receipt of a locknut if the conduit nipple grounding bushing is connected between two electrical boxes or for threaded engagement with a threaded hub of a conduit body if the conduit nipple grounding bushing is connected between an electrical box and a conduit body; and a grounding lug dimensioned for securement to one of the mounting pads by a screw, wherein the mounting pad includes a threaded bore for receipt of said screw.