From Drawing to Model — Reading One-Lines & Panel Schedules for SKM

Start here · the big picture

How a model gets built, start to finish

Before any detail, here is the whole journey on one screen: you read the one-line, build the system element-by-element in SKM, then run the studies in order. Everything else on this page is a zoom-in on one of these steps. The build order follows the SKM PowerTools workflow. SOURCE E · SKM PTW tutorial

Phase 1 — Build the model on the one-line

You re-create the one-line inside SKM, top to bottom, exactly as you read it.

1Start a new project. SKM creates a project folder that holds the one-line, the data and every report.
2Lay out the buses. One Bus per voltage level you found on the drawing — e.g. a 12.47 kV source bus and a 208 V switchboard bus. Name each, set its nominal kV. → reading the one-line
3Add the utility source. Drop a Utility and connect it to the top bus; enter its voltage, short-circuit kA/MVA and X/R. → Step 1
4Add the transformer between two buses. Connect its primary to the HV bus and secondary to the LV bus; enter the six numbers. → Step 2
5Add cables / feeders. A Cable on each branch — size, # conductors, length, material. → branches
6Add the protective devices. Place each breaker/fuse, pick the real device from the library, set frame, interrupting kA and trip unit. → Step 3 · Step 4
7Add the loads. A Load or Motor on each panel/MCC bus — kVA or HP, FLA, PF. → panel schedule

Phase 2 — Run the studies, in this order

Order matters: each study assumes the previous one passed.

LF 1 · Load Flow Run it first. Confirms voltages and currents are sensible — catches a swapped voltage or wrong kVA before it poisons everything downstream.

SC 2 · Short Circuit Calculates the bolted fault current at every bus (≈12.5 kA at our 208 V switchboard). The number every breaker is judged against.

EE 3 · Equipment Evaluation Compares each device's interrupting rating against that fault — the pass/fail table. → Step 2B

CS 4 · Coordination (TCC) Set the trip units so the device nearest a fault trips first. → Step 4

5 · Arc FlashWith protection set, the arc-flash study computes incident energy and PPE per IEEE 1584 — the labels that go on the equipment. It is the last study because it depends on every step before it.

The mental modelRead the one-line → rebuild it in SKM bus-by-bus → feed each element its real data → run the studies in order. The rest of this page teaches you exactly what data each element needs and where to find it.

Phase 1 · data

What the model is hungry for

A study model is only as good as the data you feed it. Before opening the software, your real job is to harvest a handful of numbers from the drawings. The right-hand column shows the actual value from our work-along study so you know what "good data" looks like.

The real system we follow on this pageThe values below come from a published low-voltage facility study run in SKM PowerTools. The site is fed from utility (LG&E) at 12.47 kV, stepped down by a 225 kVA transformer to a 208Y/120 V Siemens main switchboard, which feeds branch panelboards. We model that exact system, piece by piece. SOURCE A · e-Hazard SKM study

What the model needs	Where it hides on the drawings	Real value in our study
System voltages	One-line bus labels	12.47 kV → 208Y/120 V
Utility short-circuit	Note near the utility symbol	Isc 3φ = 3,808 A, X/R = 8.0 @ 12.47 kV
Transformer kVA, V, %Z, X/R	Transformer callout / data sheet	225 kVA · 12.47 kV–208 V · %Z = 1.80 · X/R ≈ 3.7
Breaker frame, interrupting kA, trip unit	One-line tag, schedule, submittal	e.g. GE SGDA 400 A, 65 kA (Panel A main)
Cable size, length, conduit	One-line feeder tags / cable schedule	CBL-0001: (2) 500 kcmil Cu, 250 ft
Loads (kVA / HP / FLA)	Panel & MCC schedules	Transformer sec. FLA = 624.5 A

Nameplate > Schedule > AssumptionAlways prefer a value read off the actual nameplate or manufacturer submittal. In our study the engineer physically went to site and recorded the transformer kVA, voltages, %Z and primary fuse from the equipment itself — not from a drawing. That is the gold standard. If you must assume, write it down.

Step 1

Reading a One-Line, then modelling it

A one-line ("single-line") diagram collapses all three phases into one line so you can see the path of power from the utility to the load. The diagram below is drawn from our real study. Click each red dot — it gives the actual recorded data and which SKM element it becomes. SOURCE A

▲ Redrawn from the real study one-line. Tap a numbered dot.

👆 Click a red dot to see the real recorded data, where it came from, and how to model it.

This is the real thing — the actual study one-line

The clean diagram above is a teaching simplification. Below is the actual one-line / model drawing from the published SKM study. It looks busier, but it is the same logic: source at the top, the red line is the 208 V switchboard bus, and every box hanging below is a panel or load. Scroll inside the frame; open full size to read any box.

Real SKM one-line / arc flash model drawing from the published study — SOURCE APublished SKM PowerTools model one-line — "XYZ Company, Base Project."

Top centre & right: the two `225 kVA` utility transformers feeding the site.

The long red horizontal line = the `208 V` Siemens main switchboard bus — the same bus you modelled above.

Each block below = a panel / disconnect / motor, with its calculated fault current and arc-flash result printed next to it.

↗ Open full-size one-line

Read the one-line in this order (every single time)

1Start at the top — the source. Find the utility and its short-circuit strength (here Isc 3φ = 3,808 A, X/R 8.0). This is your first bus.
2Follow the line down. Power flows top→bottom. Each device you pass (fuse, breaker, switch) is a protective element; each horizontal bar is a bus.
3Mark every voltage change. The transformer takes 12.47 kV down to 208 V — a new voltage = a new bus base. Note both voltages and the connection.
4Name every bus. Here: "SIEMENS MAIN SWBD" at 208 V, then Panel 1, Panel 3, Panel A… each becomes a Bus.
5Capture the branches between buses. The cable tag (CBL-0001) gives the impedance between the transformer and the switchboard.

How the one-line maps to SKM, element by element

On the one-line you see…	In SKM you create…	Key fields to fill
Utility source + "Isc 3,808 A, X/R 8.0"	Utility component	Voltage, 3φ short-circuit A or MVA, X/R
A horizontal bar (switchboard / panel)	Bus	Name, nominal kV
Two stacked circles (transformer)	2-Winding Transformer	kVA, pri/sec kV, %Z, X/R, connection
A fuse or breaker symbol in the line	Branch with a protective Device	Frame/sensor, interrupting kA, settings
A feeder tag (e.g. "(2) 500 kcmil, 250 ft")	Cable on the branch	Size, # conductors, length, material
A panel / motor block	Load / Motor	kVA or HP, FLA, PF

Quick check: the bar labelled "SIEMENS MAIN SWBD · 208 V" becomes which SKM element?

Step 2

Modelling the transformer and the breaker

These two elements set the fault levels for the whole downstream system. We model the actual transformer and breakers from our study, with their real recorded values.

2A · The transformer — six numbers, with the real ones filled in

From the site data sheet for transformer TLM# 33669, here are the exact six things you need: SOURCE A

#	Field	Real value	Where it came from	SKM input
1	Rating (kVA)	`225 kVA`	Transformer nameplate	Base kVA
2	Primary voltage	`12.47 kV`	Bus above (utility side)	Primary kV
3	Secondary voltage	`208Y/120 V`	Bus below (switchboard)	Secondary kV
4	Impedance %Z	`1.80 %`	Nameplate	%Z on transformer kVA base
5	X/R ratio	`≈ 3.7`	Primary-side data / library	X/R
6	Connection	`Δ – Y-grounded`	Vector group / nameplate	Winding config

Real transformer field data sheet recorded on site — SOURCE AThe actual field data sheet the engineer filled in at site — this is where every number in the table above comes from.

Row 1 `Transformer kVA → 225 kVA`; Row 2 `12.47 kV – 120/208 V`; Row 3 `%Z = 1.62 / 1.80%`; Row 5 `X/R = 4.11 / 3.67`.

Note it lists the primary fuse `C10, 25 amps` — that became the primary-fuse device in the model.

↗ Open full-size data sheet

SKM checks your arithmeticEnter kVA + both voltages and SKM auto-computes the full-load amps. In our study the model reports primary FLA = 10.4 A and secondary FLA = 624.5 A for this 225 kVA unit — exactly what 225 kVA at 12.47 kV and 208 V should give. If the FLA the software shows doesn't match your hand-check, a voltage or the kVA is wrong. SOURCE A

Three classic transformer mistakes

%Z on the wrong base. Our 1.80% is on the transformer's own 225 kVA. Don't hand-convert unless you know why.
Forgetting the connection / grounding. A delta–wye with a grounded secondary changes ground-fault behaviour completely.
Swapping primary/secondary voltage. Read the bus above (12.47 kV) vs. below (208 V) — not left/right of the symbol.

2B · The breaker — capture its identity before any settings

A breaker is a branch carrying a protective device. Before any trip setting, record its identity. These are real devices pulled straight from the study's equipment list: SOURCE A

Device (real)	Frame / range	Interrupting rating	Calc. fault	Result
GE SGDA (Panel A main)	125–400 A	65 kA	15.32 kA	Passed
Siemens HQR2 (Panel 3 main)	100–250 A	65 kA	11.15 kA	Passed
Cutler-Hammer BAB (branch)	15–100 A	10 / 65 kA	10.81 kA	Passed
GE TMQB (sub-panel)	60–125 A	42 kA	15.09 kA	Passed

Real equipment evaluation table from the SKM study — SOURCE AThe real Equipment Evaluation report — every protective device checked against the calculated fault.

Column `INT kA` = the calculated fault; the device's `Rating%` shows how much of its interrupting capacity is used.

Status `Passed` means rating > fault. This is exactly the check described below.

↗ Open full-size evaluation table

The one check you must never skipAfter the short-circuit run, compare each breaker's interrupting rating against the calculated fault current at its bus. Every device above passes because its rating (65/42 kA) comfortably exceeds the fault (≈11–15 kA). If fault > rating, the breaker is under-rated — a safety finding, not a rounding error. This equipment-evaluation table is half the reason the study exists.

Breaker fact	SKM field	Effect in the study
Frame / sensor ampere	Device frame / sensor	Upper bound on continuous & trip settings
Interrupting rating (kA)	Device interrupting capacity	Pass/fail vs. calculated fault current
Trip unit / model	Device library selection	Picks the time-current curve shape

Quick check: the transformer nameplate says %Z = 1.80. The model should…

Step 3

Finding the breaker's real data

A one-line might just say "400 A". That is not enough to model protection. The catalog (type) number on the nameplate or submittal encodes the frame, the interrupting rating, the poles and the trip unit. Learn to decode it — using a real manufacturer catalog.

Where to find the catalog number

1Equipment submittal / shop drawings — most reliable; lists every device's full type number.
2Breaker nameplate — the label on the breaker face / escutcheon.
3Panel schedule — sometimes lists the breaker type in a "device" column.
4Manufacturer catalog — to decode the string once you have it.

Decode a real type number — Schneider MasterPact NW

Click each block. The meanings and ratings come straight from the manufacturer's MasterPact catalog. (Example: a 2000 A frame, 65 kA, 3-pole drawout breaker with an electronic LSI trip unit.) SOURCE B

frame family

frame ampere

performance

5.0

trip unit

Click a block above to decode it.

The real interrupting-rating table (MasterPact NW, Icu at 440 V) SOURCE B

Performance level	Icu @ 440 V	Catalog wording — what it's for
N1	42 kA	Standard applications with low short-circuit levels
H1	65 kA	Industrial sites with high short-circuit levels
H2	100 kA	High-performance for heavy industry
H3	150 kA	Critical applications needing high performance + discrimination
L1	150 kA	High current-limiting capability

Frame ampere code → rated current: NW08 = 800 A, NW10 = 1000, NW12 = 1250, NW16 = 1600, NW20 = 2000, NW25 = 2500, NW32 = 3200, NW40 = 4000 A. The sensor (Ir) for an NW20 is selectable from 1000–2000 A. SOURCE B

Real MasterPact NW interrupting rating table from manufacturer catalog — SOURCE BThe manufacturer's own characteristics page. The table above is read straight off this.

Find the row `Ultimate breaking capacity Icu` at `220/415/440 V` → the values `42 / 65 / 100 / 150 kA` line up under N1 / H1 / H2 / H3.

The sensor-rating row shows the selectable `In` for each frame.

↗ Open full-size catalog page

The general pattern (most LV breakers follow it)Frame family → frame ampere → performance / interrupting level (N/H/L) → poles / connection → trip unit + sensor/rating plug. Other brands use different letters — the GE SGDA and Siemens HQR2 from Step 2 encode the same four ideas — but the logic is identical.

Don't confuse frame, sensor and tripAn NW20 = 2000 A frame can carry a 1000 A sensor with long-time pickup at 0.8, giving a continuous trip of ~800 A. Three different numbers — keep them straight or your coordination curve sits in the wrong place.

Quick check: in MasterPact NW, the performance code (N1 / H1 / H2 / L1) primarily tells you the breaker's…

Step 4

Modelling the trip unit

The trip unit is the "brain" of an electronic breaker. Modelling it = telling SKM which protection functions exist and what each is set to. Modern units are described by the letters L S I G. The setting ranges below are the real adjustable ranges from a Micrologic electronic trip unit instruction bulletin. SOURCE C

L Long-Time

Protects against sustained overload — "the wire is slowly cooking."

Ir = long-time pickup (continuous current) 0.4 – 1.0 × In

tr = long-time delay (how long it tolerates overload)

S Short-Time

Catches downstream faults but waits a beat so the breaker closer to the fault trips first (selectivity).

Isd = short-time pickup 1.5 – 10 × Ir

tsd = short-time delay (set in 0.1 s steps)

I Instantaneous

No intentional delay — trips immediately on a big fault to protect the breaker itself.

Ii = instantaneous pickup 2 – 15 × In

G Ground-Fault

Senses current returning through ground — currents a phase device would miss.

Ig = ground pickup tg = ground delay (0.1 s steps)

Read the trip unit suffix5.0 / 5.0P = LSI (no ground). 6.0 / 6.0P = LSIG (adds ground fault). So a "Micrologic 6.0" breaker needs the G function modelled; a "5.0" does not. The catalog number from Step 3 told you which one you have. SOURCE C

How to model it in SKM — the workflow

1Pick the device from the library. Match the manufacturer + trip unit family. This loads the correct curve shape.
2Set the sensor / plug rating In first. All the % settings are relative to In.
3Enter each segment: LTPU & LT-delay, STPU & ST-delay, Instantaneous. An electronic device is essentially these 5 segments (+ ground).
4Add the Ground function if present. Create a Ground function, set pickup/delay, and point its sensing at the neutral/residual as designed.
5Read it off the Time-Current Curve (TCC). Each setting moves a curve segment. Drag-adjust is allowed, but type the real submittal values — don't eyeball.

Trip unit dial	SKM curve segment	Typical setting source
Ir (long-time pickup)	LTPU	Continuous load / cable ampacity
tr (long-time delay)	LTD	Coordination study
Isd (short-time pickup)	STPU	Selectivity with downstream
tsd (short-time delay)	STD	Selectivity / withstand
Ii (instantaneous)	Instantaneous	Equipment withstand
Ig / tg (ground)	Ground function	Ground-fault protection scheme

Settings come from the study, not the factoryPer the manufacturer bulletin, units ship with long-time pickup at 1.0 and everything else at the lowest setting / off. The whole point of the coordination study is to choose these settings. Model the as-set (or proposed) values, and note where each came from. SOURCE C

Quick check: a breaker's trip unit is a "Micrologic 5.0". Which function do you not need to model?

Companion drawing

Reading a Panel Schedule

If the one-line is the skeleton, the panel schedule is the muscle — it lists every circuit on a panelboard. The example below mirrors a real published 208Y/120 V panelboard schedule (a public infrastructure project). Click a column header to see what it means and how it feeds the model. SOURCE D

CKT ▾	Load Description ▾	Load (kW/VA) ▾	Breaker ▾	Poles ▾	Phase ▾	LF ▾
1	Runway Regulator R1	7.5 kW	70 A	2	A·B	0.8
3	Runway Regulator R2	7.5 kW	70 A	2	B·C	0.8
5	Field Lighting Control	1.2 kW	20 A	1	A	1.0
7	SPARE	—	20 A	1	C	—
9	SPACE	—	—	—	—	—

👆 Click a column header above.

Real published panelboard schedule (VAULT, 208Y/120V) from a public infrastructure project — SOURCE DThe actual panelboard schedule the interactive table above is built from — a public-domain electrical plan sheet.

Header strip: `VOLTS 208Y/120V`, `BUS RATING 400`, `SHORT CIRCUIT RATING 30 kA`, `MAIN CIRCUIT BREAKER 300/3` — read these before any circuit.

Left/right circuit columns: `Runway Regulator 7.5 kW → 70/2` at `USAGE FACTOR 0.8`, exactly the row you explored above.

Bottom rows total the load *per phase (A / B / C)* — that balance is what feeds load-flow.

↗ Open the full plan sheet (also shows a real bonding / earthing one-line)

Header block you must read firstAbove the circuit list, the real schedule states: panel name VAULT, voltage 208Y/120 V, 3Ø 4W, bus 400 A, main breaker 300 A / 3-pole, plus the AIC rating. These define the panel's Bus and its main device — read them before any individual circuit. SOURCE D

SPARE vs SPACE — not the sameA SPARE is an installed breaker with nothing connected (capacity exists). A SPACE is an empty slot with no breaker at all. Both carry ~0 load, but they say very different things about future capacity.

What the panel schedule feeds in the model

Connected load — sum the kW/VA (apply the LF, load factor) per phase; this is the panel's load for load-flow and balancing.
Branch breakers — usually too small to affect upstream coordination, but the main (300 A) and large multi-pole loads do matter.
Phase balance — the A/B/C column tells you if the panel is lopsided. Note R1 on A·B and R2 on B·C to spread the load.

Phase 1 · hands on the software

Build it in SKM — click by click

Now the actual mouse-and-keyboard sequence. This mirrors the official SKM PowerTools build workflow; the goal is to re-draw the one-line you read into the software, then feed each symbol its real data. SOURCE E

The build sequence

1New project. Start a new project — SKM automatically creates a project folder that stores the one-line drawings, the data files and the reports together. Name it for the site.
2Drop your buses. Use the New Bus tool to place one bus per voltage level. You'll get BUS-0001, BUS-0002… rename them to match the drawing ("12.47 kV Source", "208 V SWBD") and set each bus's nominal voltage.
3Add the Utility. Click the New Utility icon, drop it, and drag its connection point onto the top bus — when it connects, the open circle closes. Open its editor and enter voltage, 3φ short-circuit (3,808 A), and X/R (8.0).
4Connect the transformer between two buses. Drop a New Transformer with its primary on the 12.47 kV bus and secondary on the 208 V bus. In the Component Editor impedance sub-view, type kVA, both voltages, %Z (1.80), X/R and the connection — SKM returns the FLA.
5Run the cables. Add a New Cable off a bus and set size, # conductors per phase, length and material ((2) 500 kcmil, 250 ft). Tip: when you drop a load onto a cable end, SKM auto-inserts a hidden node-bus — that's normal, it behaves like a bus.
6Place the protective devices. Add each breaker/fuse on its branch, then pick the matching device from the library (the catalog number tells you which). Enter frame/sensor, interrupting kA, and the LSIG trip settings.
7Hang the loads. Drop a Load or Motor on each panel/MCC bus and enter kVA or HP, FLA and PF.
8Turn on a Datablock. Attach a Datablock so the one-line shows live input data and, later, study results right on the drawing.

Two habits that save hours① Build and name buses first — every other component just connects between buses, so getting them right up front prevents rework. ② After each transformer, sanity-check the FLA SKM returns against a hand calc before moving on.

Then run the studies — in order

With the model built, run the studies from the study menu. Each one builds on the last, so respect the order:

Order	Study (SKM module)	What it answers	You're checking…
1	Load Flow (DAPPER)	Bus voltages, branch currents	Did I wire it right? Any voltage way off?
2	Short Circuit (DAPPER)	Bolted fault current at every bus	How hard can each bus fault? (≈12.5 kA @ 208 V)
3	Equipment Evaluation	Device rating vs. fault	Is every breaker rated above its fault?
4	Coordination / TCC (CAPTOR)	Trip-curve selectivity	Does the nearest device trip first?
5	Arc Flash	Incident energy, PPE, boundary	What PPE label goes on the gear?

In SKM the load-flow and short-circuit pair are launched together from the balanced-system (DAPPER) studies; equipment evaluation, coordination and arc flash are their own study runs.

Your first solo exerciseOpen SOURCE A, find the transformer field sheet at the back, and build this exact 225 kVA system from scratch following steps 1–8. Run load flow then short circuit. If you get ≈12.5 kA at the 208 V switchboard, your model is correct — you've just reproduced a published study end to end.

Take it to site

One-page field checklist

Print this. Tick it off as you harvest data from each drawing — when every box is checked, you can build the model with confidence.

From the one-line

Source: utility voltage + short-circuit A/MVA + X/R (our study: 12.47 kV, 3,808 A, X/R 8.0)
Every voltage level named as a bus (12.47 kV → 208 V)
Each transformer: kVA · pri kV · sec kV · %Z · X/R · connection (225 kVA · 1.80%)
Each breaker: frame · interrupting kA · trip unit (GE SGDA 400 A · 65 kA)
Each feeder: conductor size · qty · length · material ((2) 500 kcmil · 250 ft)
Each large load / motor: kVA or HP · FLA

From the panel / equipment data

Panel header: name · voltage · main vs MLO · bus A · AIC
Connected load totalled per phase (apply LF)
Breaker catalog numbers decoded (frame / performance / trip unit / sensor)
Trip unit settings: Ir · tr · Isd · tsd · Ii · Ig · tg (as-set or proposed)
Every assumption written down with its reason

If you remember one thingRead top-down, name every bus, capture six numbers per transformer, and never enter a breaker without its interrupting rating. Everything else builds on that.

Traceable

Real reference documents

Everything on this page is traceable. Open these public documents and find the exact numbers used above — that is the best way to learn what real study data looks like.

SOURCE A Worked low-voltage facility study (SKM PowerTools)

The 12.47 kV → 225 kVA → 208 V system, the equipment-evaluation table (GE SGDA, Siemens HQR2, etc.), the cable and the recorded transformer data all come from this published example study report.

e-hazard.com — Arc-Flash-Study-Report-Example.pdf

SOURCE B MasterPact NT/NW power circuit breaker catalog

The type-number decode, the N1/H1/H2/H3/L1 performance levels and their kA ratings, the frame-ampere table (NW08–NW40) and sensor ranges are taken from the manufacturer catalog.

srentp.com — Masterpact NW & NT Catalogue.pdf

SOURCE C Micrologic electronic trip unit instruction bulletin

The LSIG functions and the adjustable setting ranges (Ir 0.4–1.0×In, Isd, Ii, Ig, factory defaults) come from the trip-unit instruction bulletin.

download.schneider-electric.com — MicroLogic 5.0P/6.0P Instruction Bulletin

SOURCE D Public 208Y/120 V panelboard schedule

The panel-schedule format and the example circuits (208Y/120 V, 400 A bus, 300 A main, runway-regulator loads at 7.5 kW / 70 A / 0.8 LF) mirror a public infrastructure project's panelboard schedule.

apps1.dot.illinois.gov — Illinois DOT panelboard schedule

SOURCE E SKM Power*Tools (PTW) tutorial

The build sequence (new project → buses → utility → transformer between buses → cables → devices → loads) and the study order (load flow → short circuit → equipment evaluation → coordination → arc flash) follow the official PTW tutorial workflow.

skm.com — Power*Tools for Windows Tutorial (PDF)

How to use these in trainingHave each new engineer open SOURCE A, find the transformer data sheet at the back, and rebuild the 225 kVA transformer in SKM from scratch. Then run a short-circuit and confirm they get ≈12.5 kA at the 208 V switchboard — the same answer the published study got. That single exercise covers everything on this page.

From Drawingto Model.

How a model gets built, start to finish

Phase 1 — Build the model on the one-line

Phase 2 — Run the studies, in this order

What the model is hungry for

Reading a One-Line, then modelling it

This is the real thing — the actual study one-line

Read the one-line in this order (every single time)

How the one-line maps to SKM, element by element

Modelling the transformer and the breaker

2A · The transformer — six numbers, with the real ones filled in

2B · The breaker — capture its identity before any settings

Finding the breaker's real data

Where to find the catalog number

Decode a real type number — Schneider MasterPact NW

The real interrupting-rating table (MasterPact NW, Icu at 440 V) SOURCE B

Modelling the trip unit

L Long-Time

S Short-Time

I Instantaneous

G Ground-Fault

How to model it in SKM — the workflow

Reading a Panel Schedule

What the panel schedule feeds in the model

Build it in SKM — click by click

The build sequence

Then run the studies — in order

One-page field checklist

From the one-line

From the panel / equipment data

Real reference documents

SOURCE A Worked low-voltage facility study (SKM PowerTools)

SOURCE B MasterPact NT/NW power circuit breaker catalog

SOURCE C Micrologic electronic trip unit instruction bulletin

SOURCE D Public 208Y/120 V panelboard schedule

SOURCE E SKM Power*Tools (PTW) tutorial

From Drawing
to Model.