Grounded Non-Metallic Floor Box Assembly for Corrosion Resistance

Solution Overview

Problem

Conventional electrical floor boxes made of metal are expensive, prone to corrosion, and require disassembly for conduit installation, while non-metallic boxes fail to meet grounding requirements.

Innovation Solution

A non-metallic base with a conductive grounding bus system, comprising a conductive bracket and bridge, allows for effective grounding through a metallic top, enabling efficient installation and corrosion resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a metallic base is used in conventional electrical floor boxes to provide grounding conductivity, then grounding requirements are met, but the cost increases and corrosion susceptibility increases

Engineering Contradiction:

Improvegrounding conductivityVSAvoidcorrosion

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The grounding function is segmented from the base structure. The base can be non-metallic while a separate metallic grounding bus or conductive elements are integrated to provide grounding paths, allowing the base material to be chosen for corrosion resistance while grounding requirements are met through dedicated conductive components

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The floor box assembly uses composite construction combining non-metallic base materials (for corrosion resistance) with metallic grounding elements (for conductivity). This composite approach allows each material to perform its optimal function - the non-metallic base resists corrosion while integrated metallic grounding buses provide reliable electrical grounding paths

Inventive Principle:

Principle #40Composite materials

2Reliability

If a metallic base is used in conventional electrical floor boxes to provide grounding continuity, then grounding requirements are met, but the cost increases

Engineering Contradiction:

Improvegrounding continuityVSAvoidcost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The grounding function is segmented from the base structure. The base can be non-metallic while a separate metallic grounding bus or conductive elements are integrated to provide grounding paths, allowing the base material to be chosen for corrosion resistance while grounding requirements are met through dedicated conductive components

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention uses cost-effective non-metallic base materials instead of expensive metallic bases, while integrating affordable metallic grounding elements only where necessary for electrical connectivity. This selective use of materials reduces overall manufacturing cost while maintaining grounding continuity

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If conventional electrical floor boxes are made entirely of metal, then grounding is provided, but flexibility and adaptability are reduced

Engineering Contradiction:

Improvegrounding provisionVSAvoidmaterial flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The floor box assembly uses composite construction combining non-metallic base materials (for corrosion resistance) with metallic grounding elements (for conductivity). This composite approach allows each material to perform its optimal function - the non-metallic base resists corrosion while integrated metallic grounding buses provide reliable electrical grounding paths

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The grounding function is segmented from the base structure. The base can be non-metallic while a separate metallic grounding bus or conductive elements are integrated to provide grounding paths, allowing the base material to be chosen for corrosion resistance while grounding requirements are met through dedicated conductive components

Inventive Principle:

Principle #1Segmentation

4Stability of the object's composition

If conventional electrical floor boxes require disassembly for conduit installation, then structural integrity is maintained, but installation time and complexity increase

Engineering Contradiction:

Improvestructural integrityVSAvoidinstallation time

Core Design Contradiction:

Stability of the object's compositionVSLoss of time

Solution Approach 1:

Conduit pathways and access points are pre-formed or pre-configured in the floor box structure during manufacturing. This preliminary action allows conduit installation to proceed without disassembling the floor box, as installers can simply route conduits through pre-designed openings or attach conduits to pre-positioned mounting points, significantly reducing installation time while maintaining structural integrity

Inventive Principle:

Principle #10Preliminary action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution provides cost-effective, corrosion-resistant electrical floor boxes that meet grounding requirements without disassembly, facilitating easy conduit installation and maintaining electrical connectivity.

Implementation Method 1

A grounding bus is configured to form a grounding path with an electrical device positioned in the at least one compartment

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS12620793B2Electrical floor box assembly and method of installing same

Publication Date: 2026.05.05 HUBBELL INC

AI summary

An electrical floor box assembly includes a grounding bus to provide a grounding path for one or more electrical devices positioned in the floor box. The floor box includes a base and a top. The top is configured to be removably secured to the base to at least partially close an interior space of the base. The top includes an opening for providing access to a user to the interior space of the base when the top is secured to the base.