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                Safety Eligibility Letter LS-70
  
  **Hardware Type:**
            Luminaire Supports
                          **Code:**
            LS-70
                          **Date:**
            02/09/2011
                          **Testing Criteria:**
            NCHRP 350
                          **Manufacturer:**
            Akron Foundry Company
                          **Device Description:**
            Cast Aluminum Breakaway Transformer Bases
                          **View PDF:**
            ls70.pdf (127.03 KB)
    
    "FHWA Logo"

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 BaseLS-17
			August 6, 1990
			Akron Foundry
			CS-300 and CS-370 Al Transformer Bases (tests of Feralux bases)
			Transformer BaseLS-18
			August 6, 1990
			Akron Foundry
			F-1300 and F-1302 Al Transformer Bases (tests of Pole Lite bases)
			Transformer BaseLS-19
			August 6, 1990
			Akron Foundry
			TB-3-17, TB-5-9, TB-6-9 Transformer Bases, 11.5 to 15.5" BC
			Transformer BaseLS-22
			September 19, 1990
			Akron Foundry
			Chart summarizing approval letters LS-2, LS-4, LS-9, LS-15, LS-19
			Transformer BaseLS-58
			February 8, 2005
			Akron Foundry
			Addition of Stack Pack washers to TB1-17
			Transformer BaseLS-61
			December 15, 2006
			Akron Foundry
			Revised bolt circle on Akron Foundry TB-6-9
			Transformer BaseLS-62
			December 15, 2006
			Akron Foundry
			Revised bolt circle on Feralux CS-300
			Transformer BaseLS-63
			December 15, 2006
			Akron Foundry
			Revised bolt circle on Pole-lite F-1300
			Transformer BaseEnclosed 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 SafetyEnclosures U.S. DEPARTMENT OF TRANSPORTATION

**Federal Highway Administration**

1200 NEW JERSEY AVENUE, SE

WASHINGTON, DC 20590

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