Custom Search
|
|
|
||
 LANTNAVFACENGCOM A&E GUIDE
3/93
g. Manhole Design Calculations: Provide calculations verifying that
selected manhole size is adequate for training and splicing of contained
cables.
h. Cable Pulling Tension Calculations: For straight duct runs exceeding
400 feet in length and for any duct run with sweeps or multiple bends.
A.1.4.3
FORMAT
a. Assumptions and given data shall be clearly provided. Calculations
shall be described fully and shall be written clearly.
b. Computer printouts are acceptable only if accompanied by
explanations to allow adequate review of calculation methods and
results.
A.1.5
RISER DIAGRAMS
A.l.5.1
POWER ONE-LINE/RISER DIAGRAMS
a. A power one-line diagram is required for:
(1) Medium-voltage distribution systems, including substations and
switching stations.
(2) Systems involving generation, either low voltage or medium
voltage.
(3) Building switchgear, switchboards, and main distribution panels
(MDP's).
b. A one-line diagram is illustrated by Figure 1. The diagram shall show
components (including metering, protective relaying, etc.) and feeder
conductor and conduit sizes. Connections of transformers, PT's, CT's,
capacitors, etc.. shall be shown on the one-line diagram by means of
the proper symbol. Refer to other sections of this guide for specific
information required to be shown for each component.
c. On most projects, it would be appropriate to combine the one-line
diagram with a riser diagram. The one-line diagram would begin with
the medium-voltage system and continue through the transformer up
to and including the main breaker and feeder breakers within the
MDP. Sub-panels beyond the MDP would be shown in the riser
Attachment A-3
|
 
|
|
|
||
