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FHWA Home / Safety / Roadway Departure / Safety Eligibility Letter

Safety Eligibility Letter LS-70

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U.S. Department of Transportation
Federal Highway Administration

1200 New Jersey Ave. S.E.
Washington, D.C. 20590

February 9, 2011

In Reply Refer To: HSST/LS-70

Mr. Robert Sik
Akron Foundry Company
P.O. Box 27028
Akron, Ohio 44314

Dear Mr. Sik:

This is in response to your letter of June 26, 2010, requesting the Federal Highway Administration’s (FHWA) acceptance of modifications to a number of your cast aluminum transformer bases. You wish to standardize the base bottom castings stocking only parts having ground mounting bolt-circle ranges of 13 thru 15 inches, or 10 thru 12 inches, as appropriate. We concur that these modifications, as described below, are acceptable for use on the National Highway System.

Your Cast Aluminum Breakaway Transformer Bases are manufactured as a two piece weldment. The TB1 series bottom casting is used for the following bases:
                          Akron Foundry’s TB1 — 20, TB1 — 17, TB5 — 9,
                          Pole-Lite F — 1302
                          Feralux CS — 370.
You wish to standardize these base bottom castings, stocking only parts having a ground mounting bolt-circle range of 13 inches thru 15 inches.

The TB2 series bottom casting is used for the following bases:
                          Akron Foundry’s TB2 — 20, TB2 — 17, TB6 — 9
                          Pole-Lite F — 1300
                          Feralux CS — 300.
You wish to standardize these bottom castings, stocking only parts having a ground bolt-circle range of 10 inches thru 12 inches.

Also, you asked FHWA to state that the bases TB5 — 9, Pole–Lite F — 1302, and Feralux CS — 370 are acceptable for use on ground mounting bolt circles ranging from 13 inches thru 15 inches with mounting ears cut–off at 5.12 inches, typical (10.25 inches overall ).

In addition, bases TB6 — 9, Pole–Lite F — 1300 & Feralux CS — 300 are acceptable for use on ground mounting bolt circles ranging from 10 inches thru 12 inches with mounting ears cut–off @ 3.62 inches, typical. (7.25 inches overall).

The Akron Foundry Breakaway T-base information sheet (enclosed for reference) summarizes your company’s breakaway transformer bases. In letters dated June 10, 2010, addressed to both Pole-lite & Feralux Inc., your provided sketches outlining your TB 1 Series bottom casting and your TB 2 Series bottom casting. We will keep these on file for reference.

Your breakaway bases have been found acceptable in the Federal Highway Administration Acceptance letters shown in the table below.

LS-14 May 30, 1990 Valmont Industries Cast Al transformer base No. 0283093 15 inch bolt circle Transformer Base
LS-17 August 6, 1990 Akron Foundry CS-300 and CS-370 Al Transformer Bases (tests of Feralux bases) Transformer Base
LS-18 August 6, 1990 Akron Foundry F-1300 and F-1302 Al Transformer Bases (tests of Pole Lite bases) Transformer Base
LS-19 August 6, 1990 Akron Foundry TB-3-17, TB-5-9, TB-6-9 Transformer Bases, 11.5 to 15.5" BC Transformer Base
LS-22 September 19, 1990 Akron Foundry Chart summarizing approval letters LS-2, LS-4, LS-9, LS-15, LS-19 Transformer Base
LS-58 February 8, 2005 Akron Foundry Addition of Stack Pack washers to TB1-17 Transformer Base
LS-61 December 15, 2006 Akron Foundry Revised bolt circle on Akron Foundry TB-6-9 Transformer Base
LS-62 December 15, 2006 Akron Foundry Revised bolt circle on Feralux CS-300 Transformer Base
LS-63 December 15, 2006 Akron Foundry Revised bolt circle on Pole-lite F-1300 Transformer Base

Enclosed for reference please find a set of drawings representing this condition which would be true for your complete line of bases. All previous conditions contained in the acceptance letters remain in effect.

 

Sincerely

/* Signature of Michael S. Griffith */

Michael S. Griffith
Director, Office of Safety Technologies
Office of Safety

Enclosures

Page last modified on September 27, 2013.
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