National Institute of Standards & Technology, Acquisition & Assistance Div., Bldg. 301, Rm B117, Gaithersburg, MD 20899

59 -- DRAW OUT LOW VOLTAGE AIR CIRCUIT BREAKERS SOL 53SBNB860146 DUE 090798 POC Contract Specialist, Tamara Grinspon -- (301) 975-4390 -- Contracting Officer, David J. Orris -- (301) 975-4154 WEB: NIST Contracts Homepage, http://www.nist.gov/admin/od/contract/contract.htm. E-MAIL: NIST Contracts Office, Contract@nist.gov. Solicitation Number 53SBNB860146 is hereby modified as follows: The due date for receipt of quotations by the National Institute of Standards and Technology (NIST) has been changed. The new due date is September 7, 1998.*****Technical questions have been raised with respect to the combined synopsis/solicitation published in the Commerce Business Daily on August 20, 1998. These questions (Q), each followed by the respective answer (A), are as follows: Re: CLIN Item 001-Westinghouse DB-75: (Q1) Is the circuit breaker electrically or mechanically operated? (A1) Electro/Mechanical -- Closed by a D.C. coil; opened by springs electronically tripped.*** (Q2) If electrically operated, what are the control voltages? (A2) Coil Rating -- 125 volts D.C. ***(Q3) If electrically operated, are there any accessories (U.V.R. or Bell alarms)? (A3) Auxiliary contacts for "open" and "closed". *** (Q4) Mounting. Is the breaker a bolt-in, 1 position, or 3 position? (A4) 3 position- open, test, closed.***(Q5) If electrically operated, do you have a print or connection diagram #? (A5) No print or diagram available.***Re: CLIN Item 002-Westinghouse DB-50: (Q6) Is the circuit breaker electrically or mechanically operated? (A6) Electro/Mechanical -- closed by D.C. Coil; opened by springs, electronically tripped.*** (Q7) If electrically operated, what are the control voltages? (A7) Coil rating -- 125 volts D.C.*** (Q8) If electrically operated, are there any accessories (U.V.R. or Bell Alarms)? (A8) Auxiliary contacts for "open" and "closed". *** (Q9) Mounting. Is the breaker a bolt-in, 1 position, or 3 position? (A9) 3 position -- open, test, closed.*** (Q10) If electrically operated, do you have a print or connection diagram #? (A10) No print or diagram available.*** Re: CLIN Item 008-Carriere Kit: (Q11) You have "CT rating 1800/600 amp". Does that slash mean you want a multi-tap CT? (A11) The Carriere "CT" required is a multi-tap sensor designed to function with the required Carriere static trip unit.*****All interested, responsible firms should submit quotes, by 3:00 PM, Washington, DC time, on September 7, 1998, to the National Institute of Standards and Technology, Acquisition and Assistance Division, ATTN: Tamara Grinspon, Building 301, Room B117, Gaithersburg, Maryland 20899-0001. Faxed quotes will NOT be accepted. Posted 09/01/98 (W-SN244309). (0244)

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