1200 New Jersey Ave., SE

 Washington, D.C. 20590

FHWA:HSSI:NArtimovichr:ms:x61331:2/7/11

File: s://directory folder/HSST/Artimovich/LS70_Akron.dotx

cc: HSSI (NArtimovich; JDewar) 

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).
2

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

 
3

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,

Michael S. Griffith

Director, Office of Safety Technologies

Office of Safety 

Enclosures