FIFTH SUPPLEMENTAL INDENTURE GOVERNING SENIOR FLOATING NOTES DUE 2015 OFGENERAL CABLE CORPORATION

Exhibit 4.2

FIFTH SUPPLEMENTAL INDENTURE GOVERNING

SENIOR FLOATING NOTES DUE 2015

OF GENERAL CABLE CORPORATION

This FIFTH SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of September 6, 2013, among Prestolite Wire LLC, a Delaware limited liability company (“Prestolite”), and General Cable Canada Holdings LLC, a Delaware limited liability company (“Canada Holdings” and together with Prestolite, the “Guaranteeing Subsidiaries”), each a subsidiary of General Cable Corporation, a Delaware corporation (the “Company”), the Company, the other Guarantors (as defined in the Indenture referred to below) and U.S. Bank National Association, as trustee under the Indenture referred to below (the “Trustee”).

WITNESSETH

WHEREAS, the Company and certain initial Guarantors have heretofore executed and delivered to the Trustee an indenture (the “Indenture”), dated as of March 21, 2007, providing for the issuance of Senior Floating Rate Notes due 2015 (the “Notes”); and

WHEREAS, the Company and certain Guarantors have heretofore executed and delivered to the Trustee the First Supplemental Indenture, dated as of October 31, 2007, pursuant to which seven additional Guarantors agreed to unconditionally guarantee all of the Company’s Obligations under the Notes and the Indenture on the terms and conditions set forth therein; and

WHEREAS, the Company and certain Guarantors have heretofore executed and delivered to the Trustee the Second Supplemental Indenture, dated as of April 18, 2008, pursuant to which one additional Guarantor agreed to unconditionally guarantee all of the Company’s Obligations under the Notes and the Indenture on the terms and conditions set forth therein; and

WHEREAS, the Company and certain Guarantors have heretofore executed and delivered to the Trustee the Third Supplemental Indenture, dated as of September 2, 2009, pursuant to which two additional Guarantors agreed to unconditionally guarantee all of the Company’s Obligations under the Notes and the Indenture on the terms and conditions set forth therein; and

WHEREAS, the Company and certain Guarantors have heretofore executed and delivered to the Trustee the Fourth Supplemental Indenture, dated as of September 25, 2012, pursuant to which one additional Guarantor agreed to unconditionally guarantee all of the Company’s Obligations under the Notes and the Indenture on the terms and conditions set forth therein; and

WHEREAS, on December 21, 2012, the U.S. Credit Agreement was amended to, among other things, remove General Cable Company, an unlimited liability company organized under the laws of Nova Scotia (the “Canadian Borrower”), and General Cable Canada Ltd., a corporation organized under the laws of Ontario (“Canada Ltd.” and collectively with the Canadian Borrower, the “Canadian Entities”), each as a borrower or guarantor under any U.S. Credit Facility and, as of such date, each Canadian Entity was released of its obligations as a Guarantor under the Indenture; and

WHEREAS, the Indenture provides that under certain circumstances the Guaranteeing Subsidiaries shall execute and deliver to the Trustee a supplemental indenture pursuant to which the Guaranteeing Subsidiaries shall unconditionally guarantee all of the Company’s Obligations under the Notes and the Indenture on the terms and conditions set forth herein (each a “Guarantee”); and

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WHEREAS, pursuant to Section 8.01 of the Indenture, the Trustee is authorized to execute and deliver this Supplemental Indenture.

NOW, THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the Guaranteeing Subsidiaries and the Trustee mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows:

1. CAPITALIZED TERMS. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture.

2. AGREEMENT TO GUARANTEE. The Guaranteeing Subsidiaries hereby agree to provide a Guarantee on the terms and subject to the conditions set forth in the Guarantee, attached hereto as Exhibit A, and in the Indenture including, but not limited to, Article 10 thereof.

3. NO RECOURSE AGAINST OTHERS. No past, present or future member, manager, director, officer, employee, incorporator, stockholder or agent of the Guaranteeing Subsidiaries, as such, shall have any liability for any obligations of the Company, the Guaranteeing Subsidiaries, or any other Guarantor, under the Notes, any Guarantee, the Indenture or this Supplemental Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder of the Notes or any Guarantee by accepting a Note waives and releases all such liability. The waiver and release are part of the consideration for issuance of the Notes and the Guarantee.

4. NEW YORK LAW TO GOVERN. THE INTERNAL LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED TO CONSTRUE THIS SUPPLEMENTAL INDENTURE WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY.

5. COUNTERPARTS. The parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement.

6. EFFECT OF HEADINGS. The Section headings herein are for convenience only and shall not affect the construction hereof.

7. THE TRUSTEE. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made solely by the Guaranteeing Subsidiaries and the Company.

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IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed and attested, all as of the date first above written.

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EXHIBIT A

FORM OF GUARANTEE (FLOATING RATE NOTES)

Each of the undersigned (the “Guarantors”) hereby jointly and severally unconditionally guarantees, to the extent set forth in the Indenture, dated as of March 21, 2007, by and among General Cable Corporation, as issuer, the Guarantors, as guarantors, and U.S. Bank National Association, as Trustee (as amended, restated or supplemented from time to time, the “Indenture”), and subject to the provisions of the Indenture, (a) the due and punctual payment of the principal of, and premium, if any, and interest on the Floating Rate Notes, when and as the same shall become due and payable, whether at maturity, by acceleration or otherwise, the due and punctual payment of interest on overdue principal of, and premium and, to the extent permitted by law, interest, and the due and punctual performance of all other obligations of the Company to the Noteholders or the Trustee, all in accordance with the terms set forth in Article Ten of the Indenture, and (b) in case of any extension of time of payment or renewal of any Floating Rate Notes or any of such other obligations, that the same will be promptly paid in full when due or performed in accordance with the terms of the extension or renewal, whether at stated maturity, by acceleration or otherwise.

The obligations of the Guarantors to the Noteholders and to the Trustee pursuant to this Guarantee and the Indenture are expressly set forth in Article Ten of the Indenture, and reference is hereby made to the Indenture for the precise terms and limitations of this Guarantee. Each Holder of a Floating Rate Note to which this Guarantee is endorsed, by accepting such Floating Rate Note, agrees to and shall be bound by such provisions.

IN WITNESS WHEREOF, the Guarantor has caused this Guarantee to be signed by a duly authorized officer.

September 6, 2013

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