Page 7 - 2020 March E-issue

Technical Corner

disposal of municipal solid waste, until such time as
the Task Forces fnal report and recommendations are
issued and implemented.
This months article will discuss the need for transformer primary/secondary disconnecting means
Te Rochester Engineer (October 1971) within a building further down the system well past the service entrance main distribution panel.
As the fnal segment in this long-running series of
articles on the RES Afliates, this issue celebrated
th
the 25 Anniversary of the Rochester Section, The scenario requires a new step-down transformer (480-120/208) in its own room which will feed
Illuminating Engineering Society. Formed in 1947, with an initial 34 a Main Circuit Breaker panelboard located in an adjacent room. The primary overcurrent protection
members, the Rochester Section had grown to nearly 100 members, device is located out of sight and further than 50 away.
including fve corporate sustaining members. Te National Society, with
more than 10,000 members, in some 100 Sections, sponsored meetings,
seminars and presentations on the rapidly developing technologies in Do we need an additional primary disconnect switch located next to the transformer within the same
the feld of indoor and outdoor lighting. Te October RES Luncheon room? Where does the secondary disconnect need to be?
Series was announced; How Deep the Freeze? - When the Taw?,
by Frank E. Holley, Marine Midland Bank, Urban Renewal in the
Southeast Loop Area , by Michael Houseknecht, City of Rochester Starting with the primary disconnect. NEC article 450.14 was added in the 2011 code cycle. It requires
Department of Urban Renewal, Te SOFLENS Story , by William a disconnect switch, not overcurrent protection, in sight and within 50’ (per definition of within sight)
F. Coombs, Bausch & Lomb, and Te Port of Rochester , by William OR if in a remote location, the disconnect should be lockable and its location field marked on the
A. Carr, Director of the Port of Rochester. Tree short RES Evening
Courses were announced, in cooperation with the NY State School transformer.
of Industrial and Labor Relations of Cornell University; Technology
and Citizenship , by Dr. Christopher Lindley, a current City Council I do believe the overcurrent device within a panel on the 480V side would qualify as long as it is
Candidate, Interpersonal Relations , by Richard A. Wetzel, Xerox lockable, and the transformer is field marked. So, no additional disconnect required.
Corporation, and Organizational Behavior , Dr. Forrest W. Fryer,
Xerox Corporation. In a special message to unemployed engineers, the
RES invited unemployed engineers to complete a form that registered Although NEC 450.14 is silent with regards to if its referring to just the primary or both the primary
them for a re-orientation program to qualify them for re-employment and secondary, I think its safe to say its referring to just the primary disconnect. Using the illustrated
in a diferent engineering discipline. If response was sufcient, the RES
would proceed to initiate such a program in the greater Rochester area, book, it offers nice bonus verbiage of a feeder tap feeding multiple transformers, which solidifies the
at no cost to those enrolling. assumption. Keep in mind the secondary has different rules to follow.
November 3, 1971 (Board Meeting, Bausch & Lomb) Yes, the secondary has specific tap rules to follow all located in NEC section 240.21(C), which we
Te Board approved the Afliate membership application of the
Rochester Chapter, American Institute of Plant Engineers. One won’t go into here but will use to justify that you could put overcurrent protection in a different room, in
additional Regular Membership was also approved. RES Director, our case a main circuit breaker, and omit an additional disconnecting means next to the transformer as
John Schickler, announced the rescheduling of Info Expo (postponed long as the tap rule length restrictions have been met.
from November 1971) to April 27 29, 1972. Led by a larger, more
connected committee, the three-day event would include exhibits,
seminar programs and an RES 75 Anniversary Dinner. Edwin Interesting note, NEC 450.14 doesn’t indicate to field label the transformer with the secondary load it
th
Anthony reported that there would be a delay in presenting the fnal feeds. Its probably best to just do it rather than not.
report for Operation RESOURCE, due to difculties in reaching
total agreement on the fndings of some of the sub-committees. RES
Director, Roger Kober reported that RES Luncheon meeting attendance Hopefully this article finds you well and can be used as a reference for your project needs.
had been disappointing, and he was recommending that, instead of
weekly, they be schedule on alternate weeks. Te Board approved this If anyone would like to contribute to the RES magazine and add an article or would
change in scheduling, beginning in January of 1972.
like to request information on a specific topic (not limited to Electrical) just email me
at beliasz@bergmannpc.com. As always, any comments are appreciated! Thank
Subsequent articles in this series will describe the RES' continuing outreach to other
technical societies as it considered its role in this and the larger community, along you for reading.
with more of the activities of the RES as it moved to be of greater service to its
membership, especially those sufering from current economic crises, and adopted a
greater role in shaping the future of the City and its environs. Noted also, will be the
contributions made by RES members in the struggle to meet the challenges coming out
of World War II and the the Korean Confict, as well as a hoped-for period of post- Brett Eliasz, P.E., LEED AP BD+C ,
war growth and prosperity. Tese articles will also feature an impressive array of RES RES Director
activities in support of post-war re-emergence of Rochester area industry.
We welcome your questions and comments on this series.
res news - history res - technical corner MARCH2020 The ROCHESTER ENGINEER | 7