A M E R I C A N
N A T I O N A L
S T A N D A R D
NECA 100-2006
xxAF
yyAT
zzA
Symbols for
Electrical Construction
Drawings
Published by
National Electrical
Contractors Association
Table of Contents
Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iii
1.
1.1
1.2
1.3
Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Symbols Included . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Symbols Not Included . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Regulatory and Other Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
2.
2.1
2.2
2.3
Purpose of Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Organization of this Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Alternate Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Referrences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
3.
3.1
3.2
3.3
3.4
Drafting Practices for Electrical Construction Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Symbol Design and Presentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
General Drafting Practices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
CADD Practices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Electrical Construction Drawing Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Contents for Symbol Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Annex A: Alternate Fire Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
Annex B: Typical Risers, One-Line Diagrams, and Schedules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
Annex C: Reference Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
i ■
1. Scope
This publication describes graphic symbols used to
represent electrical wiring and equipment on construction drawings. In this publication, the term
“electrical” is used to include electrical, electronic,
and communications systems covered by the
National Electrical Code (NFPA 70). This publication
also summarizes recommended drawing practices for
electrical construction drawings.
1.1
Symbols Included
This standard is limited to North American symbols
for electrical wiring and equipment.
1.2
1.3 Regulatory and Other Requirements
a) All information in this publication is intended to
conform to the National Electrical Code
(ANSI/NFPA 70).
b) General requirements for installing electrical
products and systems are described in NECA 1,
Standard Practices for Good Workmanship in Electrical
Contracting (ANSI). Other National Electrical
Installation Standards provide additional guidance for
installing particular types of electrical products and
systems. A complete list of NEIS is provided in
Annex C.
Symbols Not Included
Symbols from publications of the International
Electrotechnical Commission (IEC) are not included
in this standard.
Symbols for equipment and systems not covered by
the NEC are not included in this standard.
1 ■
2. Purpose of Symbols
Symbols are a shorthand way of showing the locations, types, and sizes or ratings of electrical wiring
Table 1: Symbol Groups
Group
1.0
1.1
1.2
2.0
2.1
2.2
2.3
2.4
3.0
4.0
5.0
5.1
6.0
7.0
7.1
7.2
8.0
9.0
9.1
9.2
10.0
11.0
11.1
11.2
12.0
13.0
14.0
■ 2
Descrption
Wiring Methods
Raceways—Indicators
Raceways—Boxes and Busways
Luminaire (Lighting Fixtures)
Luminaire Fixtures—Basic Modifiers
Mounting
Luminaire Fixtures—Basic Modifiers
Orientation
Luminaire Fixtures—Basic Modifiers
Emergency
Luminaire Fixtures—Extended Fixtures
Outlets and Receptacles
Switches and Sensors
Motors—Controls
Motorized & HVAC Equipment
Security
Fire Alarm Communications & Panels
Fire Alarm Indicators
Fire Alarm Sensors
Distribution Equipment
Communications—Teledata
Communications—Audio/Visual
Communications—Equipment
Site Work
Schematic Fault Circuit Interrupter,
Personal Protection
One-Line Diagram Symbols—
Switchboard Meters
Schematic and One-Line Diagram
Symbols—Switches
Miscellaneous
Abbreviations
Nurse Call System
and equipment, and the interrelationships between
these items. It should be emphasized that drawings
need to be supplemented with specifications in order
to establish the details of the electrical systems.
2.1
Organization of this Standard
This standard contains symbols commonly and primarily used on electrical construction drawings.
Related symbols are organized into different groups,
and each symbol within a group has its own unique
identifying number. The group and symbol numbers
are not significant except as a convenient way to
identify individual symbols. See Table 1 for groups.
2.2
Alternate Fire Safety Symbols
The fire protection industry has developed and published symbols, not all of which are currently in
widespread use on electrical construction drawings.
They are shown for reference in Annex A.
2.3
References
This publication does not include every known
North American symbol for electrical equipment
shown on construction drawings. Some older symbols are either becoming obsolete over time or have
been superseded by newer symbols (which are shown
in this publication). Some electrical symbols are not
widely used on construction drawings, but usually on
wiring schematics and other types of more specialized drawings. Other drawing symbol standards and
publications are listed for reference in Annex C.
3. Drafting Practices for Electrical
Construction Drawings
3.1
Symbol Design and Presentation
a) The symbols in this standard are widely understood by those in the electrical design and construction field. Other symbols may also be used, provided
that a suitable explanation of their meaning is
included on the drawing where that symbol is used,
or on a symbol legend sheet.
b) The orientation of a symbol on a drawing does
not alter the meaning of the symbol.
c) Every symbol making up part of an electrical circuit must begin with and end with another symbol.
When a circuit continues on a different drawing, the
end of the circuitry symbol must be appropriately
noted on both drawings. This circuitry continued
notice is necessary for both vertical and horizontal
circuits.
d) Circuitry symbols may cross one another at any
angle.
e) The angle at which a circuitry symbol meets
another symbol has no particular significance unless
otherwise noted. Circuits normally meet one another
at a junction box, pull box, or piece of electrical utilization or communications equipment.
f) Future circuits and future equipment should be
indicated by dashed lines and clearly marked as
future circuits or future equipment on every drawing
where applicable.
g) Luminaire symbols should be drawn whenever
possible in their appropriate proportions, orientation, and shape. Where a luminaire symbol drawn to
scale is too small to reproduce clearly, the symbol
may be enlarged to an appropriate size while maintaining proportion and orientation.
3.2
General Drafting Practices
a) Electrical systems should be shown on plans separate from the architectural, structural, mechanical,
and other systems. For clarity, it is recommended that
the electrical symbols be drawn darker than the background drawing showing the building structure
and/or other systems.
b) Different electrical systems such as power distribution, luminaire, voice/data, fire alarm, and security/
access control should be shown on separate plans if
combining them on the same drawings would reduce
clarity.
c) Electrical plans are generally drawn to scale.
However, graphic symbols indicate only the approximate locations of electrical equipment. Provide
dimensions, details, elevations, and sections where
accurate locations of outlets, lighting fixtures, and
other equipment are required.
d) Electrical wiring required for other systems such
as HVAC, manufacturing equipment, data processing
systems, etc, should be shown on the electrical drawings where practical, if the installation is included in
the electrical contract.
3.3
CADD Practices
The following drafting practices are recommended
when using computer-aided design and drafting
(CADD) systems to prepare electrical construction
drawings.
a) All CADD electrical construction drawings should
be created at full scale, (1" = 1"), and should be plot3 ■
NECA 100
Symbols for Electrical Construction Drawings
ted at an appropriate scale on uniform sheets of sufficient size and separate from architectural, structural, mechanical or other drawings. Within a single
drawing set, the drawing scale should be the same on
as many drawings as possible.
b) All electronic files should include no more than
one floor level of a building per electronic file. In no
case should two different floors of any building be
included in one electronic file.
c) Architectural, structural or mechanical items on
the electrical construction drawings should be plotted with lighter weight lines than the electrical items.
d) Electronic files should use blocks (or cells) for all
symbology. Blocks (or cells) should use a uniform
scale. Non-uniformly scaled blocks and nested blocks
should not be used. Instead of exploding blocks to
achieve a desired graphic effect, create different variations of an existing block to accomplish the graphic
symbol appearance needed.
e) No entities should reside on layer 0. This layer is
used for referencing of blocks and blocks only.
f) All entities should be placed on layers related to
their disciplines as defined by the CAD Layer
Guidelines published by the American Institute of
Architects. These include Electrical, Plumbing,
HVAC, Architectural, Structural, Civil/Site,
Mechanical, Process Piping, and Telecommunications/Data. The purpose of using different layers is to
rationally develop designs using shared drawings.
Therefore, it is suggested that the AIA layer naming
convention be followed. Ordering information for
CAD Layer Guidelines is shown in Annex C.
3.4
Electrical Construction Drawing Set
A typical set of electrical construction drawings
includes the following:
a) Plan for each floor, roof, surrounding site, and
other area with electrical installations.
b) Site plan(s) showing incoming utility services and
substations; exterior transformers; feeders, trunk
■
4
lines and backbone cables between buildings; and site
lighting.
c) Symbol list and abbreviation list.
d) Schedule(s) of lighting fixtures, mechanical
equipment connections, transformers, etc. as appropriate. Typical schedules are shown in Annex B.
e) Riser and/or one-line diagram(s) for power distribution and other systems, as appropriate. Typical risers and one-line diagrams are shown in Annex B.
Contents for Symbol Groups
1.0
Wiring Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1
Raceways - Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.2
Raceways - Boxes and Busways . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.0
Luminaire Fixtures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1
Luminaire Fixtures—Basic Modifiers—Mounting. . . . . . . . . . 11
2.2
Luminaire Fixtures —Basic Modifiers—Orientation. . . . . . . . 11
2.3
Luminaire Fixtures —Basic Modifiers—Emergency . . . . . . . . 12
2.4
Luminaire Fixtures—Extended Modifiers . . . . . . . . . . . . . . . . . 12
3.0
Outlets and Receptacles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.0
Switches and Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.0
Motors—Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.1
Motorized and HVAC Equipment . . . . . . . . . . . . . . . . . . . . . . . 20
6.0
Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.0
Fire Alarm Communications and Panels. . . . . . . . . . . . . . . . . . . . . . . . 23
7.1
Fire Alarm Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.2
Fire Alarm Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
8.0
Power Distribution Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
9.0
Communications - Teledata . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
9.1
Communications - Audio/Visual . . . . . . . . . . . . . . . . . . . . . . . . 30
9.2
Communications - Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . 31
10.0
Site Work. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
11.0
Schematic Fault Circuit Interrupter, Personal Protection . . . . . . . . . . 33
11.1 One-Line Diagram Symbols—Switchboard
Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
11.2 Schematic and One-Line Symbol
Diagrams—Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
12.0
Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
13.0
Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
14.0
Nurse Call System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5 ■
NECA 100
Symbols for Electrical Construction Drawings
1.0 Raceways
Number
Preferred Symbol
Description
1.001
Conduit concealed in finished areas, exposed in unfinished
areas.
1.002
Conduit concealed in or under floor slab.
1.003
Non-rigid raceway system.
1.004
NE
Normal/emergency circuit.
1.005
EB
Emergency battery system wiring, minimum 10 AWG.
1.006
HT
Heat trace.
1.007
P
Underfloor power raceway.
1.008
T
Underfloor telecommunications raceway.
1.009
PT
1.010
S
1.011
PTD
Underfloor raceway for power, telephone, and data.
1.012
UCP
Undercarpet flat conductor cable (FCC) wiring system, power.
UCT
Undercarpet flat conductor cable (FCC) wiring system, telephone
1.013
■ 6
Underfloor raceway for power and telecommunications.
Underfloor signal raceway.
NECA 100
Symbols for Electrical Construction Drawings
1.1 Raceways—Indicators
Number
Preferred Symbol
Description
1.101
Conduit stub. Terminate with bushing or cap if underground.
1.102
Conduit turning up.
1.103
Conduit turning down.
1.104
SZ 2C,4#1&1#6GND.
OR
SZ 53cm,4#1&1#6GND.
1.105
(2)SZ 2C,4#1&1#6GND.
OR
(2)SZ 53cm,4#1&1#6GND.
1.106
Indicates trade size 2” or 53 mm conduit with (4) 1 AWG and
(1) 6 AWG ground.
Indicates (2) trade size 2” or 53 mm conduits with (4) 1 AWG
and (1) 6 AWG ground conductors in each conduit.
Homerun to panelboard. Number of arrows indicates number
of circuits. (Example: Homerun to panel L211 CKTS. #1 and #3.)
L211–1,3
1.107
Flexible connection to equipment.
1.108
Direct connection to equipment.
1.109
Branch circuit, full hashes indicate ungrounded-“hot” (or
switch-leg) circuit conductors. Half hashes indicates grounded
neutral circuit conductors. (No hashes indicates 1 hot and 1
neutral.) Dots indicate grounding conductors. Equipment bond
size U.N.O. “IG” indicates an isolated grounding conductor.
IG
■ 8
Symbols for Electrical Construction Drawings
NECA 100
1.2 Raceways—Boxes and Busways
Number
Preferred Symbol
1.201
Description
Underfloor raceway system junction box, flush floor mounted.
J
1.202
P
Power pole with devices indicated in the specifications and on
the drawing, “P” indicates type, “2” indicates circuit.
2
1.203
T
1.204
TP
Telecom pole with devices indicated in the specifications and
on the drawings, “T” indicates type.
Telecom/Power pole with devices indicated in the specifications
and on the drawings, “TP” indicates type, “2” indicates power
circuit.
2
1.205
Pull box—size as indicated or required.
PB OR
1.206
Cabletray size as indicated.
TR
TR
TR
TR
TR
TR
BW
BW
BW
Busway with cable tap box, rating and type as indicated on
drawings.
BW
Busway with plug-in device as indicated, shown with fused disconnect.
1.207
Cabletray size as indicated, concealed.
1.208
CTB
1.209
BW
BW
F
1.210
Busway feeding up.
1.211
Busway feeding down.
1.212
Busway expansion joint.
BW
1.213
Wireway, size as indicated or required.
WW
WW
WW
9 ■
NECA 100
Symbols for Electrical Construction Drawings
2.0 Luminaire (Lighting Fixtures)
Number
Preferred Symbol
Description
2.001
Luminaire: (drawn to approximate shape and to
scale or large enough for clarity).
2.002
Luminaire strip type (length drawn to scale).
2.003
Fluorescent strip luminaire.
2.004
Fixture—double or single head spotlight.
2.005
Exit luminaire fixture. Arrows and exit face as
indicated on drawings (mounting heights to be
determined by job specifications).
2.006
Light track. Length as indicated on the drawings,
with number of fixtures as indicated on drawings, and as indicated in the fixture schedule.
2.007
Emergency battery remote luminaire heads.
2.008
Emergency battery unit with luminaire heads.
2.009
Single luminaire pole mounted site luminaire
fixture.
2.010
Tw i n l u m i n a i r e p o l e m o u n t e d s i t e l u m i n a i r e f i x ture.
2.011
Roadway luminaire—cobra head.
2.012
Bollard type site luminaire.
2.013
Outdoor wallpack.
■ 10
Symbols for Electrical Construction Drawings
NECA 100
2.1 Luminaire Fixtures—Basic Modifiers Mounting
Number
2.100
Preferred Symbol
Description
Surface mounted fixture.
Recessed fixture.
Wa l l m o u n t e d f i x t u r e .
Suspended, pendant, chain, stem or cable hung
fixture.
Pole mounted with arm.
Pole mounted on top.
In-ground or floor mounted. (Box around symbol.)
2.2 Luminaire Fixtures—Basic Modifiers Orientation
2.200
A c c e n t / d i r e c t i o n a l a r r o w, w i t h o r w i t h o u t t a i l .
(Drawn from photometric center in direction of
optics or photometric orientation.)
Directional aiming line. (Drawn from photometric center and may be extended to actual aiming
point if required.)
Tr a c k m o u n t e d ; l e n g t h , l u m i n a i r e t y p e s a n d
q u a n t i t i e s a s s h o w n . ( Tr a c k l e n g t h d r a w n t o
scale.)
11 ■
NECA 100
Symbols for Electrical Construction Drawings
2.3 Luminaire Fixtures—Emergency
Number
Preferred Symbol
Description
2.300
NOTE:
Luminaire providing emergency illumination.
(Filled in.)
M o d i f i e r s a r e s h o w n w i t h s p e c i f i c b a s e s y m b o l s f o r c l a r i t y.
Each modifier can be used with any of the base symbols.
2.4 Luminaire Fixtures—Extended Modifiers
2.401
A
a 2
2.402
A
a
+48”
NL
2
Standard designations for all luminaire fixtures.
“A” = Fixture type, refer to fixture schedule
“NL” = Unswitched night light
“2” = Circuit number
“a” = Switch control
Mounting height.
2.403
Louvers.
2.404
Recessed, emergency fixture.
■ 12
Symbols for Electrical Construction Drawings
NECA 100
3.0 Outlets and Receptacles
Number
Preferred Symbol
3.001
Description
Floor duplex receptacle. F=flush MTD. S=surface
MTD.
F
3.002
3.003
D u p l e x c o n v e n i e n c e r e c e p t a c l e . 2 0 A 1 2 5 V.
Duplex convenience receptacle on emergency/standby circuit. Specify panelboard and circuit.
EP–2 CKT.1
3.004
3.005
Single convenience receptacle.
Single convenience receptacle on emergency/standby circuit. Specify panelboard and circuit.
EP–2 CKT.3
3.006
3.007
Double duplex convenience receptacle.
Double duplex convenience receptacle on emergency/standby circuit. Specify panelboard and circuit.
EP–2 CKT.5
3.008
Multi-outlet assembly with outlets on centers as
indicated on the drawings and in the specifications,
mounted 6" above counter or at height as directed,
A - indicates type.
A
3.009
M u l t i o u t l e t a s s e m b l y, d e v i c e s a s i n d i c a t e d .
1
3.010
1
Special receptacle - typical notation:
1— indicates example
1
OR
“ 1 ” = _ _ A , _ _ _ / _ _ _ V. , _ P o l e , _ W i r e , _ N E M A _ _ - _ _
“ 2 ” = _ _ A , _ _ _ / _ _ _ V. , _ P o l e , _ W i r e , _ N E M A _ _ - _ _
“ 3 ” = _ _ A , _ _ _ / _ _ _ V. , _ P o l e , _ W i r e , _ N E M A _ _ - _ _
3.011
Clock hanger outlet recessed mounted 8’-0” AFF or
8” below ceiling as appropriate and as directed.
3.012
Flush mounted floor box, adjustable, with both
power and voice/data receptacles.
F
3.013
J
J
Junction box. “AxBxC” indicates dimensions of junction box in either inches or centimeters.
AxBxC
13 ■
NECA 100
Symbols for Electrical Construction Drawings
3.0 Outlets and Receptacles
Number
Preferred Symbol
Description
3.014
D u p l e s r e c e p t a c l e c e i l i n g m o u n t e d 2 0 A 1 2 5 V.
3.015
Double duplex receptacle—ceiling mounted.
Receptacles And Outlets
Ty p i c a l O u t l e t N o t a t i o n s :
“a”
=
Switched outlet, “a”—indicates switch control.
“B”
=
Pedestal mounted on bench top.
“BF”
=
B e l o w f l o o r.
“C”
=
M o u n t e d 6 ” a b o v e c o u n t e r o f 4 2 ” A F F. C o o r d i n a t e e x a c t m o u n t i n g h e i g h t w i t h
architectural drawings.
“CLG”
=
Ceiling mounted.
“D”
=
Dedicated device on individual branch circuit.
“E”
=
E m e r g e n c y.
Existing device/equipment.
“F”
=
Flush floor box with fire/smoke rated penetration.
“GFCI”
=
G r o u n d f a u l t c i r c u i t i n t e r u p t e r, p e r s o n a l p r o t e c t i o n .
“GFPE”
=
Ground fault protection of equipment.
“H”
=
Horizontally mounted.
“IG”
=
Isolated ground receptacle with separate green ground conductor to isolated
ground bus in panel.
“M”
=
Modular furniture service—provide flexible connection, coordinate exact location with furniture plans.
“PED”
=
Pedestal mounted with two hour fire/smoke rated penetration.
“PT”
=
Poke thru with two hour fire/smoke rated penetration.
“S”
=
Surface mounted floor box.
“SP”
=
Surge protection receptacle.
“T”
=
Ta m p e r r e s i s t a n t s a f e t y r e c e p t a c l e .
“TL”
=
Tw i s t - l o c k .
“W”
=
Wa l l m o u n t e d d e v i c e a t 4 8 ” A F F u n l e s s o t h e r w i s e i n d i c a t e d .
“WP”
=
We a t h e r p r o o f r e c e p t a c l e w i t h “ N RT L ” l i s t e d c o v e r p l a t e f o r w e t l o c a t i o n w i t h
plug installed. MTD. 48” AFF unless otherwise indicated.
+XX
=
Dimensioned height.
.
“ E X I S T. ” =
■ 14
Symbols for Electrical Construction Drawings
NECA 100
4.0 Switches and Sensors
Number
Preferred Symbol
Description
4.001
$
or
S
Single pole switch.
4.002
$2
or
S2
Double pole switch.
4.003
$3
or
S3
Three way switch.
4.004
$4
or
S4
Four way switch.
4.005
$a
or
Sa
Switch control (lower case letter).
4.006
$CB
or
SCB
Circuit breaker switch.
4.007
$DT
or
SDT
Single pole/double throw switch.
4.008
$G
or
SG
G l o w s w i t c h t o g g l e , g l o w s i n o ff p o s i t i o n .
4.009
$H
or
SH
Horizontally mounted—with on position to the left.
4.010
$K
or
SK
Key operated switch.
4.011
$KP
or
SKP
Key operated switch with pilot light on when
switch is on.
4.012
$LV
or
SLV
Low voltage switch.
4.013
$LM
or
SLM
Low voltage master switch.
15 ■
Symbols for Electrical Construction Drawings
NECA 100
5.0 Motorized and HVAC Equipment—Controls
Number
Preferred Symbol
5.001
Disconnect switch, unfused type, size as indicated
on drawings. “xxA” indicates amperage.
xxA
5.002
xxAF
yyAT
5.003
F
xxAF CB
yyAT
5.004
ASD
5.006
$M
RV
NEMA x
5.008
Disconnect switch, fused type, size as indicated on
d r a w i n g s . “ x x A F ” i n d i c a t e s f r a m e s i z e . “ x x AT ” i n d i cates trip size.
E n c l o s e d c i r c u i t b r e a k e r, s i z e a s i n d i c a t e d . “ x x A F ”
i n d i c a t e s f r a m e s i z e . “ x x AT ” i n d i c a t e s t r i p s i z e .
M a g n e t i c c o n t a c t o r, s i z e a s i n d i c a t e d o n d r a w i n g s .
C
5.005
5.007
Description
F
NEMA x
xxA–xP
Adjustable speed drive.
Motor starter switch.
M a g n e t i c m o t o r s t a r t e r. “ RV ” i n d i c a t e s r e d u c e d
voltage. Starter size as indicated.
Combination magnetic starter and disconnect
switch. Starter size and fuse rating as indicated.
5.009
ATC
Automatic temperature control panel.
5.010
CP
Equipment control panel.
5.011
5.012
5.013
R
TD
TS P
R e l a y.
To g g l e d i s c o n n e c t s w i t c h .
Thermal motor switch with handle guard and padl o c k c a p a b i l i t y. “ P ” — i n d i c a t e s p i l o t l i g h t .
17 ■
NECA 100
Symbols for Electrical Construction Drawings
5.1 Motorized and HVAC Equipment
Number
Preferred Symbol
5.101
Description
C a p a c i t o r.
5.102
M o t o r “ 3 ” — i n d i c a t e s h o r s e p o w e r.
3
5.103
M o t o r i z e d d a m p e r.
D
5.104
B a s e b o a r d h e a t e r.
5.105
Baseboard heater with box.
5.106
R e s i s t a n c e h e a t e r.
5.107
U n i t t y p e h e a t e r.
5.108
Ceiling fan.
5.109
Paddle fan.
5.110
Wa l l f a n .
5.111
Wa t e r h e a t e r.
WH
■ 20
Symbols for Electrical Construction Drawings
NECA 100
7.0 Fire Alarm Communications and Panels
Number
7.001
Preferred Symbol
M
7.002
Description
Fire alarm master box.
F i r e f i g h t e r ’s p h o n e .
7.003
FT
C o d e d t r a n s m i t t e r.
7.004
DK
Drill key switch.
7.005
K
Key repository (knox box).
7.006
FAA
Annunciator panel.
7.007
FACP
Fire alarm control panel.
7.008
EVAC
Vo i c e e v a c u a t i o n p a n e l .
7.009
FATC
Fire alarm terminal cabinet.
7.010
BATT
B a t t e r y p a c k a n d c h a r g e r.
7.011
ASFP
Air sampling control/detector panel with associated
air sampling piping network.
7.012
TPR
Tr a n s p o n d e r.
7.013
IAM
Individual addressable module.
23 ■
NECA 100
Symbols for Electrical Construction Drawings
8.0 Power Distribution Equipment
Number
Preferred Symbol
Description
8.001
Lighting or power panel, recessed.
8.002
Lighting or power panel, surface.
8.003
Distribution panel.
8.004
Lighting or power panel on normal/generator
f e e d e r.
8.005
D i s t r i b u t i o n p a n e l o n n o r m a l / g e n e r a t o r f e e d e r.
MCC
8.006
8.007
M o t o r c o n t r o l c e n t e r.
T
T45-1
XFMR NUMBER
D r y t y p e t r a n s f o r m e r, r e f e r t o t r a n s f o r m e r s c h e d u l e ,
“T45”—indicates transformer type floor mounted.
Unless otherwise indicated, “W”—indicates wall,
“S”—indicates suspended. “R”—indicates K rating.
8.008
T
8.009
CT
8.010
G
8.011
M
Meter—single.
8.012
M
Meter and socket.
Tr a n s f o r m e r — p a d m o u n t .
Current transformer cabinet.
xxkW
8.013
TS
■ 28
G e n e r a t o r. S i z e a s n o t e d .
Tr a n s f e r s w i t c h . “ T S ” = m a n u a l t r a n s f e r s w i t c h .
“ AT S ” = a u t o m a t i c t r a n s f e r s w i t c h .
NECA 100
Symbols for Electrical Construction Drawings
10.0 Site Work
Number
Description
10.001
UF
U n d e r g r o u n d f e e d e r.
10.002
UT
Underground telephone.
10.003
UFA
Underground fire alarm.
10.004
UTV
U n d e r g r o u n d t e l e v i s i o n ( C AT V ) .
10.005
E
Above ground pole mounted electrical.
10.006
T
Above ground pole mounted telephone.
10.007
F
Above ground pole mounted fire alarm.
10.008
TV
A b o v e g r o u n d p o l e m o u n t e d t e l e v i s i o n ( C AT V ) .
10.009
MH
Manhole.
10.010
HH
Handhole.
10.011
P
10.012
10.013
■
Preferred Symbol
32
Pxxxx
E
T
U t i l i t y p o l e . “ P x x x x ” i n d i c a t e s p o l e n u m b e r.
Combination pre-fabricated manholes for power
a n d t e l / d a t a s y s t e m s . “ E ” = d e n o t e s p o w e r, “ T ” =
denotes tel/data.
“J” hook.
Symbols for Electrical Construction Drawings
NECA 100
11.0 Schematic and One-line Diagram Symbols
Number
Preferred Symbol
11.001
Description
C a p a c i t o r.
11.002
Circuit breaker (open). “xxAF” indicates frame size.
“ y y AT ” i n d i c a t e s t r i p s i z e .
xxAF
yyAT
11.003
Circuit breaker (enclosed). “xxAF indicates frame
s i z e . “ y y AT ” i n d i c a t e s t r i p s i z e .
xxAF
yyAT
11.004
P r i m a r y d r a w o u t t y p e c i r c u i t b r e a k e r. “ x x A F ” i n d i c a t e s f r a m e s i z e . “ y y AT ” i n d i c a t e s t r i p s i z e .
xxAF
yyAT
11.005
L o w v o l t a g e d r a w o u t t y p e c i r c u i t b r e a k e r. “ x x A F ”
i n d i c a t e s f r a m e s i z e . “ y y AT ” i n d i c a t e s t r i p s i z e .
xxAF
yyAT
11.006
xxAF
yyAT
zzA
Low voltage draw out type circuit breaker with current limiting fuses. “xxAF” indicates frame size.
“yyAT” indicates trip size. “zzA” indicates fuse rating.
11.007
Contact, normally open (NO) (“TC”—with timed
closing).
11.008
Contact, normally closed (NC). (“TO”—with timed
opening).
CT
11.009
11.010
Current transformer cabinet.
Fused cutout. “zzA” indicates fuse rating.
zzA
11.011
Disconnect switch unfused.
11.012
zzA
11.013
Disconnect switch air break with fuse. “zzA” indicates fused rating.
Fuse. “zzA” indicates fuse rating.
zzA
zzA
33
■
NECA 100
Symbols for Electrical Construction Drawings
11.0 Schematic and One-line Diagram Symbols
Number
Preferred Symbol
Description
11.014
O v e r l o a d r e l a y.
11.015
Grounding connection—system and or equipment.
11.016
K2
11.017
Kirk key interlock system. “2”—indicates related
kirk keys.
Lightning arrester and grounding to protect all
phases.
3
11.018
M o t o r a n d l a b e l . “ 3 ” d e n o t e s h o r s e p o w e r.
xx-xx-x-x
MO
11.019
11.020
Motor operator for circuit breakers or switches.
N e t w o r k p r o t e c t o r.
PANEL
Panelboard.
▼
11.021
11.022
11.023
Stress cone.
11.024
R e s i s t o r.
ST
11.025
11.026
34
Shunt trip.
Magnetic starter with NEMA size indicated.
1
■
Pothead.
Symbols for Electrical Construction Drawings
NECA 100
11.0 Schematic and One-line Diagram Symbols
Number
Preferred Symbol
11.027
G r o u n d f a u l t c i r c u i t i n t e r r u p t e r, p e r s o n n e l p r o t e c tion.
GFCI
xxx KW
xxxV-xø
GENERATOR
G
▼
11.028
Description
xxx KVA
xxxV xø xW PRI
OOOO
G e n e r a t o r.
▼
Tx
OOOO
11.029
Tr a n s f o r m e r, d r y t y p e . U n l e s s o t h e r w i s e i n d i c a t e d .
xxxY/xxxV xø xW SEC
P o t e n t i a l t r a n s f o r m e r. “ 3 ” — i n d i c a t e s q u a n t i t y.
(3)
(3)
400-5A
OO
11.031
OO
11.030
C u r r e n t t r a n s f o r m e r. “ 3 ” — i n d i c a t e s q u a n t i t y, “ 4 0 0 5A” indicates ratio.
11.032
3-phase, 3-wire delta connection.
11.033
Corner grounded delta.
11.034
3-phase, 4-wire wye connection (grounded neutral).
11.035
AFD 3
xx-x-x
Adjustable frequency drive.
3 r e f e r e n c e s d e t a i l n u m b e r.
11.036
XX’ xxxV BUSDUCT
B u s d u c t o r b u s w a y.
11.037
XX’ xxxV WIREWAY
W i r e w a y.
35
■
NECA 100
Symbols for Electrical Construction Drawings
11.2 Schematic and One-line Diagram Symbols—Switches
Number
11.201
Preferred Symbol
N
E
L
Tr a n s f e r s w i t c h .
11.202
Push button (start).
11.203
Push button (stop).
11.204
Limit switch.
11.205
Flow switch.
11.206
Pressure switch.
11.207
Float switch.
11.208
11.209
■
AUTO/MANUAL
TRANSFER SWTICH
xxA-xP
Description
38
R
P i l o t l i g h t . L e t t e r i n d i c a t e s c o l o r. E x a m p l e : R = r e d .
Solenoid.
Symbols for Electrical Construction Drawings
NECA 100
12.0 Miscellaneous
Number
Preferred Symbol
Description
12.001
G
G r o u n d b a r. L e n g t h t o b e n o t e d .
12.002
AC
M e c h a n i c a l e q u i p m e n t t a g n u m b e r, r e f e r t o
mechanical equipment schedule.
2
12.003
E q u i p m e n t t a g n u m b e r, r e f e r t o e q u i p m e n t s c h e d ule, “K”—indicates kitchen, “C”—indicates compute r.
K2
B
12.004
Note symbol, refer to note as indicated.
12.005
1
F e e d e r n u m b e r, r e f e r t o “ f e e d e r s c h e d u l e ” .
12.006
A
Ty p i c a l / s i m i l a r r o o m o r a r e a l a y o u t s y m b o l . “ A ” —
indicates layout type.
12.007
A
E–2
Ty p i c a l l a y o u t s y m b o l — r e f e r t o l a y o u t t y p e . “ A ” o n
drawing E-2, circuits to be used are as indicated.
CKT/ P21–5,7
E–4
SCALE: N.T.S.
▼
12.009
DESCRIPTION
▼
2
12.008
B
E–2
12.010
2
E–4
D e t a i l h e a d e r, i n d i c a t i n g d e t a i l N o . 2 o n d r a w i n g E 4.
S e c t i o n i d e n t i f i e r, i n d i c a t i n g s e c t i o n “ B ” o n d r a w i n g E - 2 . L e f t o r r i g h t a r r o w.
D e t a i l i d e n t i f i e r, i n d i c a t i n g d e t a i l N o . 2 o n d r a w i n g
E-4.
39
■
NECA 100
Symbols for Electrical Construction Drawings
13.0 Abbreviations
Abbreviation
■
Description
Abbreviation
Description
1P
One pole
DIST
Distribution
2P
Two pole
DN
Down
3P
Three pole
DWG
Drawing
4P
Four pole
DT
Dusttight(*)
1P1W
One pole, one wire
E
Wired on emergency circuit
1P2W
One pole, two wire
EA
Each
2P2W
Two pole, two wire
EC
Electrical contractor
2P3W
Two pole, three wire
EF
Exhaust fan
3P2W
Three pole, two wire
ELEC
Electric(al)
3P3W
Three pole, three wire
EMER
Emergency
3P4W
Three pole, four wire
EMT
Electric metallic tubing
4P4W
Four pole, four wire
ENCL
Enclosure
A
Ampere
EOL
End of line
AC
Alternating current
EPO
Emergency power off
AF
AMP frame
EQUIP
Equipment
AFCI
Arc-fault circuit interrupter
EWC
Electric water cooler
AFF
Above finished floor
EWH
Electric water heater
AFG
Above finished grade
EXIST.
Existing
AHU
Air handling unit
F
Flush
AIC
Ampere interrupting capacity
FA
Fire alarm
AL
Aluminum
FBO
Furnished by others
AS
AMP switch
FC
Fire protection contractor
AT
AMP trip
FCU
Fan coil unit
ARCH
Architect
FDN
Foundation
ATS
Automatic transfer switch
FIXT
Fixture
AUD
Audiometer box connection
FLA
Full load amps
AUX
Auxiliary
FLEX
Flexible
A/V
Audio visual
FLR
Floor
AWG
American wire gauge
FMC
Flexible metallic conduit
BLDG
Building
FRE
Fiberglass reinforced epoxy conduit
C
Conduit (Generic term for raceway.
FURN
Furniture
Provide as specified.)
GC
General contractor
CAM
Camera
GEN
Generator
CAT
Catalog
GFCI
Ground fault circuit interrupter
CATV
Cable television
GFPE
Ground fault protection equipment
CB
Circuit breaker
GND
Grounded
CKT
Circuit
GRC
Galvanized rigid conduit
COL
Column
HGT
Height
C.T.
Current transformer
HP
Horsepower
CU
Copper
HV
High voltage
CL
Centerline
HVAC
Heating, ventilating and air
DC
Direct Current
conditioning
Delta
HW
Hot water
DET
Detector
Hz
Hertz (cycle) per second
DISC
Disconnect
IAM
Individual addressable module
40
Symbols for Electrical Construction Drawings
NECA 100
13.0 Abbreviations
Abbreviation
Description
Abbreviation
Description
IC
Intercommunication
#
Number
ID
Identification
NTS
Not to scale
IG
Isolated ground
O2
Oxygen
IMC
Intermediate metal conduit
OHD
Overhead door operator
IPS
Interruptible power supply
P
Pole
IR
Passive infrared
PB
Pull box
JB
Junction box
PC
Plumbing system contractor
KCMIL
Thousand circular mils
PE
Primary service
K/O
Knock-out
PH ø
Phase
KVA
Kilovolt ampere
PNL
Panel(board)
KVAR
Kilovolt ampere reactive
PIV
Post indicating valve
KW
Kilowatt
PP
Power panel
LFMC
Liquidtight flexible metallic conduit
PR
Pair
LFNC
Liquidtight flexible nonmetallic conduit
PRI
Primary
LP
Lighting panelboard
PT
Potential transformer
LS
Limit switch
PVC
Polyvinyl chloride conduit
LTG
Lighting
PWR
Power
LV
Low voltage
RE
Remove existing
MAINT
Maintained
REC
Recessed
MAU
Make-up air unit
RECP
Receptacle
MAX
Maximum
REF
Roof exhaust fan
MC
Metal clad cable
RL
Relocate existing
MCB
Main circuit breaker
RM
Room
MCC
Motor control center
RMC
Rigid metal conduit
MD
Motorized damper
RT
Raintight(*)
MDP
Main distribution panel
RTU
Rooftop unit
MISC
Miscellaneous
RSC
Rigid steel conduit
MFR
Manufacturer
S
Surface mounted
MLO
Main lugs only
SCH
Schedule
MOD
Motor operated disconnect switch
SD
Smoke damper
MTD
Mounted
SE
Secondary electric service
MTG
Mounting
SEC
Secondary
MTS
Manual transfer switch
SIG
Signal
N
North
SN
Solid neutral
N/A
Not applicable
SP
Spare
NC
Normally closed
SPKR
Speaker
NEC
National Electrical Code
SPL
Splice
NF
Non-fused
SS
Stainless steel
NIC
Not in contract
STP
Shielded twisted pair
NL
Night light
STL
Carbon steel
NM
Nonmetallic sheathed cable
SUSP
Suspended
NO
Normally open
SW
Switch
NRTL
Nationally recognized testing lab
SWBD
Switchboard
(*) It is recommended that the appropriate NEMA designation be used in place of this abbreviation.
41
■
NECA 100
Symbols for Electrical Construction Drawings
13.0 Abbreviations
Abbreviation
■
Description
Abbreviation
Description
SWGR
Switchgear
UTP
Unshielded twisted pair
TC
Telephone cabinet
V
Volt
TCI
Telecommunications cabling installer
VT
Vaportight(*)
TCP
Temperature control panel
Y
Wye
TEL/DATA
Telephone/data
W
Watt
TEL
Telephone
W/
With
TERM
Terminal(s)
WH
Watthour
TV
Television
WP
Weatherproof
TYP
Typical
WP
Weatherproof
UC
Under counter
WT
Watertight(*)
UG
Underground
XFMR
Transformer
UH
Unit heater
XP
Explosion proof(*)
U.O.I.
Unless otherwise indicated
ZAM
Zone adapter module
UPS
Uninterruptible power source
+72
UTIL
Utility
42
TEMP
Temporary
Mounting units to centerline above
finished floor or grade
Annex B: Typical Risers, One-line
Diagrams, and Schedules
This annex provides examples of typical schedules, riser diagrams, and one-line diagrams that are included in
electrical construction drawings. A given set of drawings will not necessarily include every typical example
included here. This annex includes the following:
Type
Page
Panel schedule . . . . . . . . . . . . . . . . . . . . . . . 49
Lighting fixture schedule . . . . . . . . . . . . . . . 50
Transformer schedule . . . . . . . . . . . . . . . . . 51
Mechanical equipment schedule. . . . . . . . . 52
Feeder schedule . . . . . . . . . . . . . . . . . . . . . . 53
Electrical one-line diagram . . . . . . . . . . . . . 54
Fire alarm riser . . . . . . . . . . . . . . . . . . . . . . . 55
■
48
49
■
Load
(VA)
Trip
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
Trip
Bkr.
Frame
Modifications: __________________________
Load Name
Total VA: ________________________
Load
(VA)
Amps RMS. Sym.: ________________________________
Phase C: _____________________
42
8
7
41
6
5
Ckt.
No.
4
C
3
B
2
A
Mains: __________________________
Location: _______________________________________________
Wires: ___________
1
Ckt.
No.
Phase B: _____________________
Bkr.
Frame
Mfg./Type: ________________________
Phase A: _____________________
Load Name
Phase: _____________
Enclosure: __________________________
Voltage: ___________________
Mount: _______________________
Panel: _____________
Panel Schedule
■
50
Type
Manufacturer
Catalog No.
Description
Lighting Fixture Schedule
Mounting
Lamps
51
■
Designation
Manufacturer
Catalog
Number
KVA
ø
PRI. Volts
PRI.
Conductor
Size/No.
Transformer Schedule
Sec.
Volts
Sec.
Conductor
Size/No.
Ground
Conductor
Size/No.
Mounting
■
52
Designation
Description
Quantity
Volt
ø
FLA
HP
KVA
Min.
Wire
Size/Type
Mechanical Equipment Schedule
Max.
Fuse
Size
Min.
CCT
Amps
Remarks/
Disconnect
Type
Feeder Schedule
#
No.
No. Runs
No. Wires/Size
Insul.
CU/AL
Conduit
Origin
Termination
53
■
NECA 100
Symbols for Electrical Construction Drawings
Electrical One-Line Diagram
FROM 480V
U N I T S U B S TAT I O N # 8
FROM EMERG.
SWITCHGEAR
3EH01B6
N
3EHA1B6B
1200A
4 8 0 V, 3 W + G , 3 P
65,000A RMS SYM CLOSING
A N D W I T H S TA N D R AT I N G
E
L
EMERGENCY DISTRIBUTION SWITCHBOARD
3 E H 0 1 C 6 B , 1 2 0 0 A , 4 8 0 V, 3 Ø , 3 W + G , 6 5 , 0 0 0 I E R
800A
800A
600A
1
1200A
125A
150A
3
2
4
EMERGENCY DISTRIBUTION SWITCHBOARD
3 E H M 8 D 8 B , 8 0 0 A , 4 8 0 V, 3 Ø , 3 W + G , 6 5 , 0 0 0 I E R
800A
▼
OOOO
OOOO
400A
240A
240A
9
3EHT185
7 5 K VA
480V 3Ø 3W PRI
120/208V 3Ø 4W SEC
3EHL1B5
4
11
10
250/M
5
AFD
36-2-2
1
AFD
32-5-2
2
RV N R
22,000 IER
800
240A
6
5
1
AFD
32-2-2
54
250
150
F-36-2-2
P-32-5-2
EMERGENCY DISTRIBUTION SWITCHBOARD
3 E H M 1 D 4 B , 8 0 0 A , 4 8 0 V, 3 Ø , 3 W + G , 6 5 , 0 0 0 I E R
300A
■
125
C-26-1-1
240A
S PA R E
3
AFD
32-2-4
600
EMERGENCY DISTRIBUTION SWITCHBOARD
3 E H M 1 D 4 D , 6 0 0 A , 4 8 0 V, 3 Ø , 3 W + G , 6 5 , 0 0 0 I E R
240A
240A
S PA R E
240A
8
7
1
AFD
32-2-8
150
125
125
EF-32-2-2
EF-32-2-4
EF-32-2-8
240A
S PA R E
3
AFD
32-2-10
125
EF-32-2-10
S PA R E