Outlet Box Cable Protector Screw Isolation

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Solution Overview

Problem

Electrical cables in outlet boxes often suffer insulation damage due to contact with externally threaded mounting screws, which can lead to short circuits during the termination of fixtures.

Innovation Solution

An electrical outlet box design incorporating a cable protector that separates the mounting screw from the cables, either as a separately attachable element, an indented portion of the side wall, or integrally formed with the box, creating a channel to prevent contact and abrasion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If mounting screws are used to secure fixtures to the outlet box, then the fixture can be firmly mounted, but the cables may come into contact with the screws causing insulation damage

Engineering Contradiction:

Improvemounting strengthVSAvoidcable insulation damage

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

A cable protector is introduced as an intermediary component between the mounting screw and the cables. The protector extends from the mounting tab toward the bottom wall of the box, creating a physical barrier that separates the screw from the cables while allowing the screw to securely mount the fixture.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The outlet box is segmented into functional zones by the cable protector, which divides the internal space into a mounting zone (where the screw operates) and a cable zone (where cables are protected). This segmentation allows the mounting function to be performed without exposing cables to harmful contact.

Inventive Principle:

Principle #1Segmentation

2Reliability

If the outlet box includes a cable protector, then cable protection is improved, but the device complexity increases

Engineering Contradiction:

Improvecable protectionVSAvoidbox structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The cable protector is merged with the mounting tab structure, forming an integrated component. The protector can be integrally formed with the side wall or attached to the mounting tab, reducing the number of separate parts and simplifying the overall box structure while maintaining protective functionality.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The cable protector serves multiple functions: it protects cables from screw contact, provides structural support for the mounting tab, and can act as a spacer to maintain proper positioning. This multi-functionality reduces the need for additional components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS8097806B2Cable protector for electrical outlet box

Publication Date: 2012.01.17 THOMAS & BETTS INTERNATIONAL INC

AI summary

An electrical outlet box assembly includes an electrical outlet box and a cable protector. The outlet box includes a box interior for accommodating an electrical fixture and an electrical cable terminated to the fixture. The outlet box includes a mounting tab having a threaded aperture therethrough. The mounting screws are insertable through the aperture of the mounting tab. The cable protector is positioned adjacent the mounting tab for separating the mounting screw from the interior of the box for preventing contact between the mounting screw and the cable terminated therein.