Quantcast Required Calculations

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LANTNAVFACENGCOM A&E GUIDE
3/93
f. Present drawings in a clear and concise manner specifically defining
the work to be accomplished. Locate legends on the first sheet of the
applicable electrical drawings. Use multiple legends where required,
carefully identifying the specific use of each legend. Avoid using
composite legends which include all symbols but fail to indicate which
symbols are to be used where. Use symbols as indicated in attached
guide legends (see Appendixes A through D).
PREPARING SPECIFICATIONS
A.1.3
See Section 6 of the basic guide.
A.1.4
CALCULATIONS
A.1.4.1
DESIGNER RESPONSIBILITY
The designer is responsible for calculations to verify proper design and
operation of the facility to the point of connection to the existing electrical
systems.
REQUIRED CALCULATIONS
A.1.4.2
Whenever the sizing of electrical transformers, breakers, electric cables, etc.,
is to be performed, provide calculations to verify proper facility design. The
following calculations are usually required:
a. Short Circuit: Provide an impedance diagram with calculated fault and
impedance values. Refer to IEEE Std 399, "IEEE Recommended
Practice for Industrial and Commercial Power Systems Analysis". For
transformers larger than 1000 kVA in size, the primary or source
impedance shall not be assumed to be equal to 0; source impedance in
such situations shall be requested from LANTNAVFACENGCOM
Code 163.
b. Voltage Drop: Quote applicable source for this calculation.
c. Lighting: Interior and exterior.
d. Load Analysis: Indicate connected load and demand load utilizing
appropriate diversity and demand factors.
e. Motor Starting/Flicker Analysis: For motors 50 hp and greater.
f. Sag, Tension, and Guying Analysis: For overhead distribution systems.
Attachment A-2





 


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