Drawings Numbering System


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 Uniform Drawing System (UDS) include what is called the sheet identification which be used to label Sheets and drawings in a manner that makes their content and referencing clear.


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
A

Discipline Character

A
Modifier Character

-
Hyphen

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
-
-
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
.


Note: The hyphen in the Level 1 discipline designator is a required place holder in the absence of the second character of Level 2.

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


If the level of detail demands it, the electrical engineer may decide to segregate the telephone system information onto sheets with the Level 2 designator ET (Electrical Telecommunications).

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


For an even more complex project involving voice, data, security, and signal systems, separate drawings for each communications system may be required, perhaps even produced by a network specialist. In this case the discipline designator T (Telecommunications) could be used, combined with specific modifier characters to create the Level 2 discipline designators TN (Telecommunications Network), TT (Telecommunications Telephone), or TY (Telecommunications Security).

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


To download a complete list of all Level 1 and Level 2 designators , please click on the link.

To download a complete list of Sheet Identifications, please click on the link.


in the next Topic, I will continue explaining the other components of UDS sheet identification. please, keep following.



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