Page 7 - 2020 February E-issue

Technical Corner

June 9, 1971 (Board Meeting, Treadway Inn)
Te Board approved six new applications for Regular
Membership and three for Junior Membership. This months article focuses on ambient temperature adjustments for raceways and cables exposed to sunlight on or
A proposal by Dr. Harry Sine of the Rochester above a rooftop. It will also speak to some of the changes over the past few NEC Code cycles, which are shown below.
Committee for Scientifc Information, that the
RES consider sponsoring an all-day symposium
on successfully run solid waste landflls, received
considerable discussion, following which the Board
approved $750 in funding to support the inclusion of
several experts on this subject.

Te Rochester Engineer (June 1971)
In thanking the RES staf and membership for their eforts during
the past year, outgoing President, G. Robert Leavitt pointed out some
recent successes of the Society, including Operation RESOURCE, the
upcoming Fall 1972 Info Expo, establishment of a very successful
RES Explorer Post, and the continuing work of the Education
Committee in bringing a variety of inspiring technical presentations
to the Engineering Community. An article celebrating the life-long
contributions of RES Executive Secretary O. Laurence Angevine
to the Rochester Engineering Community also announced the
establishment of a memorial fund in his honor. Te RES announced
the establishment of a relationship with the NYS Department of Labor
and the California Department of Human Resources for the purpose of You will see that these tables are very close and did not appear to change between these cycles. However, the NEC
matching engineers, scientists and employers in the Rochester area with 2017 has removed these tables and offers a 60 degree F adder to ambient temp only when the bottom of the raceway
employment opportunities through the use of computers programmed or cable is located less than 7/8 above the roof.
for this purpose. Candidate Registration Forms for accessing this service
would be available, upon request to the RES ofce, without regard to an The 2017 code also adds the exception that using type XHHW-2 cable eliminates the need to comply with any ambient
individuals RES membership status. temperature adjustments.

September 8, 1971 (Board Meeting, Bausch & Lomb) Example
Te Board approved four new Regular Membership applications,
one upgrade from Junior Member and one Associate Membership. A circuit for a 100A calculated load will need to be routed directly to the roof without any spacing from the roof surface.
Disappointing sales of booth space to local commerce and industry,
despite consultation with several local public relations and advertising Loads are not continuous and the neutral should not be considered a current carrying conductor. Location is Rochester
agencies, caused the Executive Committee to recommend the NY. Determine minimum size conductor using 90 degree C copper THWN-2 conductors. Use NEC 2017.
postponement of the Fall 1971 Info Expo to next year, 1972, the
RESs 75 Anniversary. Te Board also approved the establishment of a Per ASHRAE standards the ambient temperature for Rochester NY is 86 deg F.
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$500 discretionary fund for use by the Planning Committee. A progress
report by the Civic Afairs Committee on the status of Operation The temp adder is 60 degrees F per NEC 310.15(B)(3)(c). So, the design temp is 86 + 60 = 146 deg F
RESOURCE included the announcement that they would be making
a preliminary presentation to the Monroe County Environmental Look in table 310.15(B)(2)(a) and the 90 deg C column to find a .65 adjustment factor.
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Management Council on September 15 , in advance of the planned
November 11 public presentation and recommendation. Tere was Take 100A and divide by .65 to get 153.8 Amps
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much discussion, in which concern was expressed that the RES must
make it clear that the Society is NOT in competition with consulting
engineering frms. It was emphasized that the RES would continue to Select a conductor not less than 153.8 from table 310.15(B)(16) using the 90 degree C copper columns to get: #1/0.
work with ANY consulting frm engaged by the County to develop a Check the corresponding 75 deg C column to ensure this value of 150A is larger than the anticipated load of 100A,
proposal for solid waste management, and that ALL materials developed which it is.
by Operation RESOURCE would be made available to any such frm.
Hopefully this article finds you well and can be used as a reference for your project needs.
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
with more of the activities of the RES as it moved to be of greater service to its If anyone would like to contribute to the RES magazine and add an article or would like to request
membership, especially those sufering from current economic crises, and adopted a information on a specific topic (not limited to Electrical) just email me at beliasz@bergmannpc.com. As
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 always, any comments are appreciated! Thank you for reading.
of World War II and the the Korean Confict, as well as a hoped-for period of post-
war growth and prosperity. Tese articles will also feature an impressive array of RES Brett Eliasz, P.E., LEED AP BD+C ,
activities in support of post-war re-emergence of Rochester area industry. RES Director
We welcome your questions and comments on this series.
res news - history res - technical corner FEBRUARY 2020 The ROCHESTER ENGINEER | 7