Introduction:
A drafter’s goal is to make a drawing as readable as a book to people trained in interpreting drawings. These people have different backgrounds; they include designers, contractors, subcontractors, owners, vendors, lenders and others. Making drawings readable to members of these groups is facilitated by following industry conventions and standards, the most common being the Uniform Drawing System (UDS) devised jointly by the American Institute of Architects (AIA) and the Construction Specifications Institute (CSI).
However, these conventions can only be discussed at a general level, because each company has its own set of drafting standards. A protocol you learn in one office may be different in another. However, such protocols are never so different that you would not be able to infer what a differently-drafted label or symbol means as long as you understand the label or symbol in the first place.
Sheet Identification
A
|
A
|
-
|
N
|
N
|
N
|
Discipline Designator
|
|||||
A
|
A
|
-
|
N
|
N
|
N
|
Hyphen
|
|||||
A
|
A
|
-
|
N
|
N
|
N
|
Sheet Type Designator
|
|||||
A
|
A
|
-
|
N
|
N
|
N
|
Sheet Sequence Number
|
|||||
A= alphabetical
character
|
|||||
N= numerical
character
|
The sheet identification format is applicable to both manual and CAD drawing production. It is consistent, yet flexible enough for a wide range of project scopes. The UDS sheet identification format depicted here has four components:
1- The discipline designator.
2- The hyphen.
3- The sheet type designator.
4- The sheet sequence number.
Fist Component: Discipline Designator
It is the first component of the sheet identification format used to identify the sheet as a member of a subset or to assign the category of subject matter contained in the drawing and it has three components as follows:
1- Discipline character: it is the first character in the discipline designator.
2- Modifier character: it is the second character in the discipline designator.
3- Dash (Hyphen): it is used in case of modifier character absence.
Note: the Hyphen may come in the second position but never will come in the first position.
Levels of sheet identification (According to Discipline Designator)
A
|
|
Discipline Character
|
|
|
A
|
Modifier Character
|
|
|
-
|
Hyphen
|
1- Discipline character: it is the first character in the discipline designator.
2- Modifier character: it is the second character in the discipline designator.
3- Dash (Hyphen): it is used in case of modifier character absence.
Note: the Hyphen may come in the second position but never will come in the first position.
Levels of sheet identification (According to Discipline Designator)
A
|
-
|
-
|
N
|
N
|
N
|
Level 1 Discipline Designator
|
|||||
A
|
A
|
-
|
N
|
N
|
N
|
Level 2 Discipline Designator
|
UDS allows two levels of sheet identification:
Level 1 It offers the simplest identification format and would be suitable for all but the most complex projects; it consists of a Discipline character with a hyphen.
Level 2 It provides guidance for complex or special types of projects; it consists of Discipline character with a modifier character.
Level 1 It offers the simplest identification format and would be suitable for all but the most complex projects; it consists of a Discipline character with a hyphen.
Level 2 It provides guidance for complex or special types of projects; it consists of Discipline character with a modifier character.
For example, the electrical engineer may be the designer for a telephone system. The drawings required may be included on the E (Electrical) sheets along with the rest of the drawings produced by that designer.
Examples for Level 1 discipline designator are provided in the below table.
Level 1 Discipline Designator
|
|
G
|
General
|
H
|
Hazardous
Materials
|
V
|
Survey/Mapping
|
B
|
Geotechnical
|
W
|
Civil Works
|
C
|
Civil
|
L
|
Landscape
|
S
|
Structure
|
A
|
Architectural
|
I
|
Interiors
|
Q
|
Equipment
|
F
|
Fire
Protection
|
P
|
Plumbing
|
D
|
Process
|
M
|
Mechanical
|
E
|
Electrical
|
T
|
Telecommunications
|
R
|
Resource
|
X
|
Other
Disciplines
|
Z
|
Contractor/Shop
Drawings
|
O
|
Operations
|
In this case, Examples for Level 2 discipline designator are provided in the below table.
Level 2 Designator
|
|
ES
|
Electrical
Site
|
ED
|
Electrical
Demolition
|
EP
|
Electrical
Power
|
EL
|
Electrical
Lighting
|
EI
|
Electrical
Instrumentation
|
ET
|
Electrical
Telecommunications
|
EY
|
Electrical
Auxiliary Systems
|
In this case, Examples for Level 2 discipline designator are provided in the below table.
Level 2 Designator
|
|
TA
|
Audio
Visual
|
TC
|
Clock And
Program
|
TI
|
Intercom
|
TM
|
Monitoring
|
TN
|
Data
Networks
|
TT
|
Telephone
|
TY
|
Security
|
in the next Topic, I will continue explaining the other components of UDS sheet identification. please, keep following.
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