1 July 1998
11-1. MANDATORY DESIGN CRITERIA AND STANDARDS. Although not all-inclusive, this
paragraph contains Federal requirements that are established by executive orders, public laws,
local requirements, and other directives. These requirements and all other Federal
requirements must be reviewed and included, as applicable, in the RFP for each new project.
a. Nonlinear loads. In all areas with raised floors and in areas (including but not limited
to open office spaces and computer center) where nonlinear load type equipment
predominates, such as computers, printers, uninterruptible power supply (UPS), motors with
variable speed drives, electronic ballasts and dimmers and other similar loads, ETL 1110-3-
403, "Electrical Power Systems for Nonlinear Loads," dated 30 June 1989; IEEE Std 1100
"Powering and Grounding Sensitive Electronic Equipment", IEEE Std. 519, "Practices and
Requirements for Harmonic Control in Electrical Power Systems" shall be used as design
guides. Additionally, the use of 75 or 90 degree C (minimum) terminals and insulated
conductors is required and shall be so stated in the project and identified in the RFP
documents. Use of 75 degree C conductors on circuits with protective device terminals rated
for 60 degree C is inappropriate. National Electrical Code (NEC) and Underwriter's Laboratory
(UL) rules and instructions shall be followed in applying the ampacity tables in the NEC
beginning with Table 31-6. Since virtually all electrical equipment that meets the approval
required by article 110-2 of the NEC is UL listed , the equipment must be installed in
accordance with UL instructions. The basic rule of the UL Electrical Construction Materials
Directory states that in general "the termination provisions are based on the use of 60 degree
C ampacities for wire sizes No. 14-1 AWG, and 75 degree C ampacities for wire sizes Nos. 1/0
AWG and larger, as specified in table 310-16 of the National Electrical Code." Higher rated
conductors than specified may be used if the size is based upon the previous statements.
b. ETL 1110-3-412, "Transformer Application Guide", will be used in the selection and
application of transformers and dielectrics. For those areas with high nonlinear load, "K" factor
rated transformers are required. Provide a schedule identifying the "K" factor rating for each
c. Engineering and design of Cathodic Protection and coatings are required as indicated
in accordance with Army Engineer Technical Letter (ETL) No. 1110-3-474. Include
requirements in the RFP. Requirements should not be included by reference to the ETL.
d. Interior voice and data communications systems will be designed in accordance with
the applicable Telecommunications Industry Association (TIA) and Electronic Industries
Association (EIA) documents. Specify in the RFP the applicable standard based upon the size
of the project.
e. The design-build RFP must include the Corps of Engineers Electronic Security
Systems Technical Manual (TM5-853-4) and appropriate Corps of Engineers Guide
Specification to ensure that electronic security systems are reliable and effective.
11-2. LESSONS LEARNED. The following subparagraphs contain recommended information
that should be considered in future RFP's in order to avoid past problems, define engineering