Site Alpha Symbol Reference Blueprint, P&ID, electrical, fire-protection and plumbing legend sheets for the Commissioning Agent line · Edition 1.0 · October 2026
G-002 General M-001 / M-002 Mechanical and P&ID E-001 Electrical F-001 Fire P-001 Plumbing
These six sheets are the legend for every Site Alpha drawing used in Commissioning Agent modules and Virtual Bench exercises. On a real project the set's own legend sheets govern. Read them first, and never guess a symbol.
Contents G-002 · GENERAL SYMBOLS AND ABBREVIATIONS M-001 · MECHANICAL AND P&ID LEGEND M-002 · INSTRUMENT TAG LETTERS AND EXAMPLES E-001 · ELECTRICAL LEGEND AND DEVICE NUMBERS F-001 · FIRE PROTECTION AND LIFE SAFETY LEGEND P-001 · PLUMBING AND FUEL LEGEND Symbol index Sources G-002 · GENERAL SYMBOLS AND ABBREVIATIONS ENGINEER OF RECORD seal area — training drawing SITE ALPHA DATA CENTER Hall 1 · Alpha 360 LLC training set REVISIONS 0 03-02 ISSUED FOR CONSTR. 1 05-18 ASI-07 / RFI-112 DRAWN AB · CHECKED CD JOB 26-014 · SCALE: NTS SHEET TITLE GENERAL SYMBOLS AND ABBREVIATIONS G-002 1 · GENERAL SYMBOLS LINES AND ANNOTATION Object line (visible edge) Hidden line (behind / below) Centerline Section cut line with view arrows Break line 12'-0" Dimension line 3 M-301 Section / detail bubble (view over sheet) B Column grid bubble 2 Revision cloud and delta N North arrow 0 4' 8' Graphic scale bar 7 Keynote tag CH-1 Equipment tag ABBREVIATIONS ABBR MEANING (E) existing (N) new (R) remove (RL) relocate AFF above finished floor ABBR MEANING BOD basis of design CL centerline EL elevation EQ equal NIC not in contract ABBR MEANING NTS not to scale SIM similar TYP typical UON unless otherwise noted VIF verify in field NOTES 1. Each discipline's 0-series sheet governs its own symbols on its own sheets. 2. Office conventions vary — read this sheet before any other sheet in the set. 3. Training drawing — Site Alpha is fictional. M-001 · MECHANICAL AND P&ID LEGEND ENGINEER OF RECORD seal area — training drawing SITE ALPHA DATA CENTER Hall 1 · Alpha 360 LLC training set REVISIONS 0 03-02 ISSUED FOR CONSTR. 1 05-18 ASI-07 / RFI-112 DRAWN AB · CHECKED CD JOB 26-014 · SCALE: NTS SHEET TITLE MECHANICAL AND P&ID LEGEND M-001 1 · MECHANICAL AND P&ID SYMBOLS (instrument symbols and tags per ANSI/ISA-5.1) VALVES AND ACTUATORS Gate valve (generic two-way) Globe valve Ball valve Butterfly valve Check valve (flow left to right) Three-way valve Pressure safety / relief valve Balancing / flow-measuring valve FC Control valve, diaphragm actuator, fail closed (FC) M FO Control valve, electric motor actuator, fail open (FO) S FL Solenoid valve, fail last (FL) Manual handwheel operator EQUIPMENT AND FITTINGS Centrifugal pump Plate / shell heat exchanger Tank / vessel Y-strainer Flexible connector Concentric reducer Cooling coil Cooling tower INSTRUMENT BUBBLES TT 101 Instrument — field mounted TI 101 Instrument — primary location, operator accessible (control room / panel front) TY 101 Instrument — behind panel, not normally accessible TIC 101 Shared display / shared control (BAS / DCS function) TY 101 Computer function XS 11 Programmable logic controller function SIGNAL LINES Process line / instrument connection to process Electrical signal Pneumatic signal Software / data link (network) Capillary tube Fail positions and pipe services: see M-002. M-002 · INSTRUMENT TAG LETTERS AND EXAMPLES ENGINEER OF RECORD seal area — training drawing SITE ALPHA DATA CENTER Hall 1 · Alpha 360 LLC training set REVISIONS 0 03-02 ISSUED FOR CONSTR. 1 05-18 ASI-07 / RFI-112 DRAWN AB · CHECKED CD JOB 26-014 · SCALE: NTS SHEET TITLE INSTRUMENT TAG LETTERS AND EXAMPLES M-002 1 · INSTRUMENT TAG LETTERS (ANSI/ISA-5.1) AND SITE ALPHA EXAMPLES TAG LETTERS 1ST MEASURED VARIABLE NEXT FUNCTION A analysis A alarm E voltage C control F flow E primary element (sensor) I current I indicate J power R record L level S switch P pressure T transmit PD pressure differential V valve / final element S speed / frequency Y relay / compute / convert T temperature H / L high / low (modifiers) Z position Z driver / actuator HOW A TAG READS T temperature I indicate C control – 101 loop number Read left to right: what is measured, then what the device does, then the loop it belongs to. SITE ALPHA TAGS TAG WHAT IT IS TT-101 temp. transmitter, CHW supply TT-102 temp. transmitter, CHW return FT-101 flow transmitter, CHW supply PDT-101 diff. pressure across Hall 1 FS-11…41 flow switches, evaporator proof TV-101 valve, loop 101 (storage) TIC-101 temp. controller (BAS, shared) ZSO / ZSC valve position switch open / closed XS-11 PLC function, chiller start LOOP EXAMPLE TT 101 TIC 101 M TV-101 · FO Transmitter → controller (shared display) → valve. Dashed = electrical signal. FAIL POSITIONS FO fail open · FC fail closed · FL fail last (stays put) · FL/DO fail last, drift open · FL/DC fail last, drift closed Fail position is what the valve does on loss of air, power or signal — it decides ride-through behavior, so it is a commissioning criterion. PIPE SERVICES CHWS / CHWR chilled water supply / return · CWS / CWR condenser water · HWS / HWR heating water · D drain · V vent E-001 · ELECTRICAL LEGEND AND DEVICE NUMBERS ENGINEER OF RECORD seal area — training drawing SITE ALPHA DATA CENTER Hall 1 · Alpha 360 LLC training set REVISIONS 0 03-02 ISSUED FOR CONSTR. 1 05-18 ASI-07 / RFI-112 DRAWN AB · CHECKED CD JOB 26-014 · SCALE: NTS SHEET TITLE ELECTRICAL LEGEND AND DEVICE NUMBERS E-001 1 · ELECTRICAL SYMBOLS (device numbers per IEEE C37.2) POWER — ONE-LINE AND BUILDING WIRING Circuit breaker (one-line) Draw-out circuit breaker Fuse Disconnect switch (open) Transformer G Generator M Motor ~ = UPS (rectifier / inverter) ATS Automatic transfer switch CT Current transformer Ground Bus (switchgear / switchboard) PM Meter (power monitor) 27 Protective relay (device number in the bubble) Duplex receptacle Panelboard (surface) J Junction box LP-1·3 Home run to panel (circuit numbers) CONTROL — LADDER AND WIRING Contact, normally open Contact, normally closed Timed contact, on-delay (timed closing) CR Relay / contactor coil Pushbutton, normally open Pushbutton, normally closed Emergency stop (mushroom head, NC) Thermal overload relay contact Flow switch contact (NO) G Pilot light (letter = color) Selector switch, two-position DEVICE NUMBERS NO. FUNCTION 2 time-delay starting relay 25 sync-check 27 undervoltage 32 directional power 49 thermal overload NO. FUNCTION 50 instantaneous overcurrent 51 time overcurrent 51G ground time overcurrent 52 AC circuit breaker 59 overvoltage NO. FUNCTION 81 frequency 86 lockout relay 87 differential Suffixes: G ground or generator · N neutral · T transformer (e.g. 87T). Pilot light letters: R red · G green · A amber · W white. F-001 · FIRE PROTECTION AND LIFE SAFETY LEGEND ENGINEER OF RECORD seal area — training drawing SITE ALPHA DATA CENTER Hall 1 · Alpha 360 LLC training set REVISIONS 0 03-02 ISSUED FOR CONSTR. DRAWN AB · CHECKED CD JOB 26-014 · SCALE: NTS SHEET TITLE FIRE PROTECTION AND LIFE SAFETY LEGEND F-001 1 · FIRE PROTECTION AND LIFE SAFETY SYMBOLS SPRINKLER, DETECTION, NOTIFICATION Sprinkler head, upright Sprinkler head, pendent PAV Preaction / deluge valve FS Waterflow switch (FS) on riser TS Valve tamper switch (TS) S Smoke detector H Heat detector F Manual pull station HS Horn / strobe EPO Emergency power off (EPO) station NOTES 1. Fire alarm device symbols vary by office; this sheet governs this set. 2. Integrated testing of fire and life-safety interfaces per NFPA 4; commissioning per NFPA 3. 3. EPO and preaction release are proven in a controlled way per the IST plan — never by surprise on live load. P-001 · PLUMBING AND FUEL LEGEND ENGINEER OF RECORD seal area — training drawing SITE ALPHA DATA CENTER Hall 1 · Alpha 360 LLC training set REVISIONS 0 03-02 ISSUED FOR CONSTR. DRAWN AB · CHECKED CD JOB 26-014 · SCALE: NTS SHEET TITLE PLUMBING AND FUEL LEGEND P-001 1 · PLUMBING AND FUEL SYMBOLS DOMESTIC WATER, DRAINAGE, FUEL RPZ Reduced-pressure backflow preventer M Water meter Floor drain CO Cleanout Hose bibb WH Water heater EW Emergency eyewash / shower FOS FOR Fuel oil supply / return (generator) PIPE SERVICES CW domestic cold water · HW domestic hot water · HWR hot water return · SAN sanitary · V vent SD storm drain · IW industrial (CHW makeup) water · FOS / FOR fuel oil supply / return (generators) Symbol index Every symbol on the legend sheets, by group, at a readable size.
General — G-002
Section cut line with view arrows
12'-0"
3 M-301
B
2 Revision cloud and delta
0 4' 8'
CH-1
Valves — M-001 Gate valve (generic two-way)
Check valve (flow left to right)
Pressure safety / relief valve
Balancing / flow-measuring valve
Actuators and fail positions — M-001 FC Control valve, diaphragm actuator, fail closed (FC)
M FO Control valve, electric motor actuator, fail open (FO)
S FL Solenoid valve, fail last (FL)
Manual handwheel operator
Mechanical equipment and fittings — M-001 Plate / shell heat exchanger
Instrument bubbles — M-001 TT 101
TI 101
TY 101
TIC 101
XS 11 Programmable logic controller function
Signal lines — M-001
Power — E-001
G
M
~ =
ATS
CT
PM
Relays — E-001 27
Control — E-001
Timed contact, on-delay (timed closing)
CR
Emergency stop (mushroom head, NC)
Thermal overload relay contact
G
Building wiring — E-001
J
LP-1·3 Home run to panel (circuit numbers)
Fire protection and life safety — F-001
PAV Preaction / deluge valve
S
H
F
FS
TS Valve tamper switch (TS)
HS
EPO
Plumbing and fuel — P-001 RPZ
CO
WH
EW
M
FOS FOR
Sources ANSI/ISA-5.1-2024, Instrumentation and Control Symbols and Identification . International Society of Automation. IEEE C37.2, Electrical Power System Device Function Numbers, Acronyms and Contact Designations (current edition). IEEE 315, Graphic Symbols for Electrical and Electronics Diagrams , and common NEMA control-diagram practice. United States National CAD Standard — sheet identification and the general (0-series) legend sheets. National Institute of Building Sciences. NFPA 3 and NFPA 4 (2024 editions) — fire and life-safety commissioning and integrated testing (F-001 notes).