Electrical Plan – Warehouse Dock & Lighting (Pages 1–3)

Drawing & Sheet References

• Numerous drawing call-outs (e.g., WTM1-37,39,41, WDP3-36, EDP2-5) appear throughout the three pages.
  • WTM, ETM ➔ “Wall/Equipment Timeclock-Monitored” branch circuits.
  • WDP, EDP ➔ “Warehouse/Equipment Distribution Panel” circuits.
  • WDH, LEDH ➔ “Warehouse/Equipment Distribution – High-bay lighting” homeruns.
  • IDF-C1, IDF-L ➔ intermediate distribution frames (telecom rooms) for the Center and Left warehouse bays.
  • XFMR WTDP3 / ETDP1 ➔ step-down transformers feeding the WDP / EDP panelboards.
  • Sheet references such as SEE SHEET 1/E302 indicate where enlarged plans or risers reside.
• Call-outs ending in just a number (e.g., WDP3-1, WDP3-2, WDP3-3) are individual homeruns leaving the noted panel; call-outs with dash-ranges (e.g., WDH3-14,16,18) are multi-circuit homeruns installed together in a common raceway.

Conductor & Raceway Conventions

• Conductor description syntax:
  \text{(qty)#(AWG)\, 1#(AWG)G.\, (conduit‐size)}
  Example: 2#12, 1#12G., 3/4" C. means:
  • two current-carrying #12 copper conductors.
  • one #12 copper equipment ground.
  • all in one $\tfrac34''$ EMT conduit.
• Unless otherwise noted, copper (CU) conductors are used. All ground wires are insulated (G.) conductors sized equal to—or larger than—the branch circuit conductors.
• Voltage class implied by circuit text:
  • “18120” ➔ $\,208/120\;\text{V}\,3\varphi\,4\text{W}$.
  • “18100” ➔ $\,208/100\;\text{V}\,3\varphi\,4\text{W}$ (lighting control).
  • “210” ➔ $\,240/120\;\text{V}\,1\varphi\,3\text{W}$.
  • “600 V” references motor disconnects that must be rated for a 600-volt class even though supplied at 480 V.

Dock Equipment – Electrical Requirements

• Each dock position receives three distinct power feeds:
  1. Motor-operated dock door
     • Provide $\,600\,\text{V},\;30\,\text{A},\;3\varphi$ fusible disconnect adjacent to door operator.
     • Coordinate breaker/fuse size with door vendor.
  2. Dock commander combo control panel (loading-dock leveler, restraint, lights):
     • Requires a receptacle-type switch at “control-box mast.”
     • Conduit stub-out left side of dock door into the recessed pit; keep at least 3″ above finished floor.
     • Field-verify conduit routing with owner and the leveler vendor before rough-in.
  3. Future EV heavy-duty charger conduit:
     • 3⁄4″ empty conduit back to panel WFC1 w/ pull-string.
     • Code driver: CALGreen heavy-duty EV ready requirement.
• Typical branch make-up: 2#12, 1#12 G., 3/4″ C. unless door motor HP triggers larger conductors.
• Where (2) Dock Control Panels are noted in parentheses ➔ both doors in that grid line share a common homerun but diverge via J-box above.

Lighting (High Bay & Wall Pack Circuits)

• LEDH1-… LEDH2-… LEDH3-… designate three lighting zones (warehouse bays 1, 2, 3).
  • Each zone splits into sequential 3-phase circuit groups:
  – e.g. LEDH1-7,9,11 (Phase A), LEDH1-13,15,17 (Phase B), LEDH1-19,21,23 (Phase C).
  • Pattern repeats every 6 luminaires to maintain balanced loading.
• Control Method: ETM/WTM (Equipment/Wall Timeclock) sequences—every lighting homerun terminates first at local timeclock bypass panel then lands on panelboard breaker.
  • Timeclock enables after-hours reduction; manual bypass preserves code-required egress lighting.
• Clearances noted several times:
  • “56" clear space between Rail & Roof Drain” and “60" between Rail & Roof Drain” show minimum lateral clearance to avoid clashes with sprinkler main & roof drain leader at fixture rows.

Mechanical Power Connections

• ROOF-MOUNTED EXHAUST FAN
  • Provide $\,600\,\text{V},\;30\,\text{A},\;3\varphi$ disconnect on the roof next to fan curb.
  • Homerun: 3#10\,\text{Cu} + 1#10\,\text{Cu GND in }3/4''\,C..
  • Conduit & control conductors as required for VFD or starter furnished by mechanical contractor.
• HVLS (High Volume Low Speed) fans appear on every sheet; each requires a dedicated 120 V circuit via the timeclock so fans shut off during unoccupied mode.

Raceway Stub-outs for Technology & Security

• Badge Reader: 3⁄4″ conduit stub to “accessible interior space” at each main entry. Coordinate height/location with tenant security vendor prior to rough-in.
• IDF Rooms (C1 & L) receive home-runs (type not explicitly shown) to serve telecom racks; keep 4–6 spare 1″ conduits to the ceiling for future pathways.

Panels, Transformers & Distribution

• XFMR WTDP3 / ETOP2 / ETDP1:
  • Pad-mounted or wall-mounted dry-type step-down units reducing 480 V to 208/120 V for house panels.
  • Coordinate K-factor $\,K\ge3$ due to nonlinear LED loads.
• Panel Nomenclature
  • WDP ➔ Warehouse Distribution (480/277 V).
  • EDP ➔ Equipment/Lighting Distribution (208/120 V).
  • WTM/ETM devices sometimes land in a small Panelboard‐sized Contactors/Lighting Panel located adjacent to the real power panel.
• Elevations: many homeruns show “+36” or “+380” which refer to mounting height (inches or mm) for J-boxes before conduit turns downward.

Field Coordination & Verification

• Every stub-out or disconnect note includes a “Field verify exact requirements with Owner/Tenant” clause—critical because dock door models, fan HP, and control panel sizes are often vendor-specific.
• Prior to rough-in the electrical contractor must:
  1. Walk each dock door with GC & dock package vendor.
  2. Confirm roof fan quantity & CFM with mechanical.
  3. Verify timeclock override scheme with BAS designer.

Code & Specification Highlights

• CALGreen mandates heavy-duty EV “make-ready” raceways at every dock position → hence empty 3⁄4″ conduits with pull-strings.
• NEC 110.26 working-clearance: 56″ & 60″ notes preserve clearance around mains, roof drains, and structural rails—ensuring luminaires or conduits won’t create obstructions.
• Disconnects labeled 600 V even on 480 V circuits comply with NEC 430.102 for motor circuits.
• All conduits called out as EMT unless schedule or outdoor location triggers RMC (rigid) or FMC (flex) transitions.

Testing, Labeling & Turn-Over Deliverables

• Label every homerun at each J-box, panel, and disconnect. Use circuit number, panel name, and voltage class.
• Perform insulation resistance testing at 1000 V on all 480 V feeders; 500 V on 208 V circuits.
• Provide as-built conduit/circuit schedule cross referencing each panel directory.

Practical Takeaways for Exam Context

• Recognize the shorthand: 2#12 + 1#12G in 3/4" C is a minimum standard branch build for 20 A circuits.
• Dock equipment typically needs three distinct circuits (door, leveler, lights/EV prep) and must be coordinated early.
• Lighting homerun naming conventions (LEDH1-7,9,11 etc.) aim at phase balancing and easy troubleshooting.
• Time-controls (ETM/WTM) are inserted ahead of the branch breaker to meet energy code while allowing manual override.
• Field verification language underscores design-build flexibility—drawings set intent; actual install driven by vendor submittals.

Key Equations & Values (LaTeX)

• Branch ampacity check (example for #12\,\text{Cu} at 75 °C):
  $I_{\text{max}} = 30\,\text{A}$ (per NEC Table 310.16)
• Conduit fill (3 conductors in 3⁄4″ EMT):
  $\text{Fill}\;\% = \frac{nA<em>c}{A</em>{em}} \le 40\%$
  where $n=3$, $A<em>c=0.053\,\text{in}^2$ for #12\,\text{THHN}, $A</em>{em}=0.533\,\text{in}^2$ → fill $\approx 29.8\%$ (within limits).