[{"data":1,"prerenderedAt":901},["ShallowReactive",2],{"navigation":3,"\u002Fdesign-tool\u002Felectrical-interconnection":240,"\u002Fdesign-tool\u002Felectrical-interconnection-surround":898},[4,120,150,167,202,227,231],{"title":5,"path":6,"stem":7,"children":8},"Commands","\u002Fcommands","1.commands",[9,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68,72,76,80,84,88,92,96,100,104,108,112,116],{"title":10,"path":6,"stem":11},"Overview","1.commands\u002Findex",{"title":13,"path":14,"stem":15},"LOAD_DT","\u002Fcommands\u002Fload-dt","1.commands\u002F1.load-dt",{"title":17,"path":18,"stem":19},"DT_VARIANTS","\u002Fcommands\u002Fdt-variants","1.commands\u002F10.dt-variants",{"title":21,"path":22,"stem":23},"DT_WIRE_SCHEDULE","\u002Fcommands\u002Fdt-wire-schedule","1.commands\u002F11.dt-wire-schedule",{"title":25,"path":26,"stem":27},"DT_BOM","\u002Fcommands\u002Fdt-bom","1.commands\u002F12.dt-bom",{"title":29,"path":30,"stem":31},"LEADER_TIDY","\u002Fcommands\u002Fleader-tidy","1.commands\u002F13.leader-tidy",{"title":33,"path":34,"stem":35},"LLMCHAT","\u002Fcommands\u002Fllmchat","1.commands\u002F14.llmchat",{"title":37,"path":38,"stem":39},"RECONNECT_DT","\u002Fcommands\u002Freconnect-dt","1.commands\u002F15.reconnect-dt",{"title":41,"path":42,"stem":43},"SIGN_OUT_DT","\u002Fcommands\u002Fsign-out-dt","1.commands\u002F16.sign-out-dt",{"title":45,"path":46,"stem":47},"DT_HELP","\u002Fcommands\u002Fdt-help","1.commands\u002F17.dt-help",{"title":49,"path":50,"stem":51},"MANAGE_TEMPLATE","\u002Fcommands\u002Fmanage-template","1.commands\u002F18.manage-template",{"title":53,"path":54,"stem":55},"Dev 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the electrical core of the Design Tool. You build and validate the one-line graph, complete every device's attributes, confirm grounding and bonding, and resolve the grid tie-in — so the design passes NEC 705 and can feed conductor sizing in Step 4.",[246,250,251,252,256],{},"It is the most interaction-heavy step. The three things worth learning first are: ",[253,254,255],"strong",{},"how the graph is authored (the halo + drag-to-wire), how to drive it to \"done\" (Required fields → Next missing), and how to read the compliance band."," Everything else is per-device data entry.",[246,258,259],{},[260,261],"img",{"alt":262,"src":263},"Step 3 graph overview","\u002Fdesign-tool\u002Fstep-3-electrical-graph.png",[265,266,268],"h2",{"id":267},"reading-the-one-line-graph","Reading the one-line graph",[246,270,271,272,275,276,280],{},"The canvas is an interactive SVG one-line. It is laid out ",[253,273,274],{},"array on the left, grid on the right"," — the toolbar hint reads ",[277,278,279],"code",{},"◀ array · author leftward · grid ▶",". Conductors flow array → PV circuit → junction box → combiner\u002Finverter → battery → disconnect → panel (MSP) → meter → utility grid.",[282,283,284,291,311,325,343],"ul",{},[285,286,287,290],"li",{},[253,288,289],{},"Device labels (A, B, C…)"," tag each path device top-to-bottom; the inspector cards below the canvas use the same letters, so \"Device B\" on the card is the \"B\" node on the graph.",[285,292,293,296,297,300,301,300,304,300,307,310],{},[253,294,295],{},"Wire numbers + amperage callouts"," on each edge (e.g. ",[277,298,299],{},"16 A",", ",[277,302,303],{},"45 A",[277,305,306],{},"PV 80 A",[277,308,309],{},"ESS 30 A",") are the live current the graph is carrying — a fast sanity check that ratings make sense before Step 4 sizes them.",[285,312,313,316,317,320,321,324],{},[253,314,315],{},"The stats bar"," summarizes the graph: e.g. ",[277,318,319],{},"25 modules · 3 circuits · 1 aggregator · 4 path devices · Tesla ecosystem · ✓ valid",". The ",[277,322,323],{},"✓ valid"," flag (vs an error count) is the headline \"is the topology legal?\" indicator.",[285,326,327,330,331,334,335,338,339,342],{},[253,328,329],{},"Service topology toggle"," (",[277,332,333],{},"Service: Detached (meter + main) ⇄",") switches between a ",[253,336,337],{},"detached meter-main"," (separate meter and main, common in CA) and an ",[253,340,341],{},"attached meter-main",". Get this right early — it changes which grounding\u002Fbonding fields apply and where the service disconnect lives.",[285,344,345,330,348,351],{},[253,346,347],{},"Live Wire-Schedule preview",[277,349,350],{},"⚡ WS · N",") expands the raceways Step 3 is producing right now — an early check that your edits are generating the segments you expect, before you reach Step 4.",[265,353,355],{"id":354},"authoring-with-the-halo-the-core-interaction","Authoring with the halo (the core interaction)",[246,357,358,359,362],{},"You don't draw boxes — you ",[253,360,361],{},"select a device and use its halo",". Click any node and the Inspector shows the halo controls:",[282,364,365,379,391,399],{},[285,366,367,373,374,378],{},[253,368,369,372],{},[277,370,371],{},"+"," toward grid"," — add the next device on the ",[375,376,377],"em",{},"grid"," (service) side of the selected one.",[285,380,381,386,387,390],{},[253,382,383,385],{},[277,384,371],{}," feeding it"," — add a device on the ",[375,388,389],{},"array"," (source) side.",[285,392,393,398],{},[253,394,395],{},[277,396,397],{},"×"," — remove the selected device.",[285,400,401,404,405,408],{},[253,402,403],{},"Drag-to-wire"," — drag from the ",[253,406,407],{},"blue grid-side port"," to connect two existing nodes.",[246,410,411,414,415,418,419,422,423,426,427,431],{},[253,412,413],{},"The most common authoring mistake:"," trying to add a service-region device (gateway, backup switch, meter collar) from the ",[253,416,417],{},"inverter or combiner",". Those sit on the array-production side, which is not eligible for service equipment — you'll see ",[253,420,421],{},"\"No eligible devices here.\""," Service-region devices must be added from the ",[253,424,425],{},"utility meter or the MSP",", toward the service side. (See Troubleshooting → ",[428,429,430],"a",{"href":200},"\"No Eligible Devices Here\"",".)",[265,433,435],{"id":434},"driving-to-done-required-fields-next-missing","Driving to \"done\": Required fields → Next missing",[246,437,438],{},"The fastest path through Step 3 is not reading every card — it's the completion loop at the top of the inspector:",[282,440,441,452,467],{},[285,442,443,444,447,448,451],{},"Switch between the ",[253,445,446],{},"Equipment"," and ",[253,449,450],{},"Edges & Raceways"," tabs — required data lives on both (device attributes vs. conductor\u002Fraceway details).",[285,453,454,455,460,461,466],{},"The banner shows ",[253,456,457],{},[277,458,459],{},"Required fields · N missing","; ",[253,462,463],{},[277,464,465],{},"Next missing →"," jumps you straight to the next blocking field.",[285,468,469,474],{},[253,470,471],{},[277,472,473],{},"Hide complete"," collapses everything you've already finished so only the gaps remain.",[246,476,477,478,481,482,485,486,447,489,431],{},"Items marked ",[253,479,480],{},"RECOMMENDED"," (e.g. ",[375,483,484],{},"\"Auto on the electrical one-line is not yet confirmed\"",") are advisory — they won't block the step, but resolving them removes ambiguity for the reviewer. Hard-required items will block Next until cleared. (See Troubleshooting → ",[428,487,488],{"href":200},"\"Required Fields Missing\"",[428,490,491],{"href":200},"\"Step Won't Advance\"",[265,493,495],{"id":494},"service-grounding-bonding","Service Grounding & Bonding",[246,497,498],{},"This section gates the service connection. It has three controls, each tied to an NEC article shown inline:",[282,500,501,507,517],{},[285,502,503,506],{},[253,504,505],{},"Listed as service equipment (SUSE)?"," — Yes\u002FNo toggle. Declares whether the panel\u002Fdisconnect is rated as Suitable for Use as Service Equipment.",[285,508,509,512,513,516],{},[253,510,511],{},"Main bonding jumper (250.24(B))"," — a ",[253,514,515],{},"Confirm"," button. The N-G bond happens once, at the service disconnecting means; confirming records where.",[285,518,519,522,523,526],{},[253,520,521],{},"Grounding electrode (GEC) (250.24(D))"," — a dropdown, with a ",[253,524,525],{},"\"Suggested: reuse existing\""," shortcut for retrofits where the existing grounding electrode system is reused.",[246,528,529,530,533],{},"A ",[277,531,532],{},"⚠ N needed"," badge on the section header means one of these still blocks completion.",[265,535,537],{"id":536},"per-device-cards-ad","Per-device cards (A–D…)",[246,539,540],{},"Each path device has a collapsible inspector card. The fields that matter most downstream:",[282,542,543,549,576,586],{},[285,544,545,548],{},[253,546,547],{},"Utility Meter"," — meter style \u002F class \u002F form code, Existing\u002FNew, service feed (Overhead\u002FUnderground), new riser\u002Fwire flags, available fault current.",[285,550,551,554,555,300,558,561,562,565,566,300,569,300,572,575],{},[253,552,553],{},"Main Service Panel (MSP)"," — Existing\u002FNew, ",[253,556,557],{},"bus rating",[253,559,560],{},"main breaker"," (+ New\u002FExisting), secondary main rating, and the ",[253,563,564],{},"Interconnection Survey"," sub-section (",[375,567,568],{},"Room for PV breaker",[375,570,571],{},"Existing solar\u002Fbattery breakers on bus",[375,573,574],{},"Space for tap","). These three feed the 705.12 busbar math directly.",[285,577,578,581,582,585],{},[253,579,580],{},"Disconnect"," — ",[253,583,584],{},"Disconnect Role"," (PV \u002F ESS \u002F etc.) and location.",[285,587,588,591,592,595,596,599],{},[253,589,590],{},"Inverter \u002F Combiner \u002F Powerwall"," — aggregate PV breaker rating, ",[253,593,594],{},"pcsControlMode",", and ",[253,597,598],{},"Power Control (PCS)"," mode.",[246,601,602,603,606],{},"Set ",[253,604,605],{},"New vs Existing"," honestly on every device — it drives both the BOM and which conductors\u002Fbreakers the wire schedule treats as already in place.",[265,608,610],{"id":609},"tie-ins-where-the-system-lands-and-why-it-qualifies","Tie-Ins — where the system lands and why it qualifies",[246,612,613,614],{},"Most user confusion happens around the tie-in card. The card explains where the DER system lands and why it's legal. ",[253,615,616,617,620],{},"Which card you see depends on ",[375,618,619],{},"how"," the system connects to the service:",[282,622,623,629,639,645],{},[285,624,625,628],{},[253,626,627],{},"Backfed breaker (load-side, NEC 705.12):"," the system lands on a breaker in the MSP, and that breaker is the interconnection OCPD. The 120% busbar rule (705.12(B)(3)) applies; the tool checks the bus rating against the main + the back-fed PV breaker.",[285,630,631,634,635,638],{},[253,632,633],{},"Load-side tap (705.12(B) taps):"," the system taps a feeder rather than a breaker; the tap\u002Fdisconnect OCPD must be represented correctly. The export refuses if the landing has no breaker rating to size the tap against (see Troubleshooting → ",[428,636,637],{"href":200},"\"Load-Side Tap Has No Breaker Rating\"",").",[285,640,641,644],{},[253,642,643],{},"Supply-side \u002F line-side (705.11):"," the system connects ahead of the main service disconnect, per 705.11 and 230.82(6). Service-side rules and disconnect placement matter — the source needs its own service-rated disconnecting means.",[285,646,647,650],{},[253,648,649],{},"PCS active (705.13):"," a power control system can qualify an otherwise-constrained busbar by limiting export; set it when a back-fed breaker would otherwise bust the 120% rule. (NEC 2023 reclassifies PCS as a sub-type of EMS — the tool tracks the project's adopted edition.)",[246,652,653,654,330,657,660,661,481,664,667,668,671,672,675,676,681],{},"A declared tie-in card shows its ",[253,655,656],{},"status",[277,658,659],{},"Connected","), its ",[253,662,663],{},"route",[277,665,666],{},"011 MS25 · Breaker Tie-In · Backfed breaker","), the ",[253,669,670],{},"PV backfeed current",", the live compliance check, and ",[253,673,674],{},"Saved \u002F Remove"," controls. ",[253,677,678],{},[277,679,680],{},"▸ Show all landing options"," reveals alternate landing devices if the default isn't what you want.",[683,684,686],"h3",{"id":685},"reading-the-compliance-band","Reading the compliance band",[246,688,689,690,693],{},"The compliance verdict is ",[253,691,692],{},"live and per tie-in"," — it grades each declared source against the bus it lands on, and updates as you edit. Two things to understand:",[282,695,696,710],{},[285,697,698,701,702,705,706,709],{},[253,699,700],{},"It needs a declared tie-in to grade."," The panel reads ",[375,703,704],{},"\"Set the panel bus rating, main breaker, and PV breaker to evaluate\""," until those exist. An ",[253,707,708],{},"undeclared back-fed breaker reads \"incomplete,\" never a false PASS"," — so an empty verdict means \"not enough data,\" not \"compliant.\"",[285,711,712,715,716,725,728,729,732],{},[253,713,714],{},"A failing 705.12(B)(3) check spells out the math."," Example from a real 200 A panel with a 60 A PV backfeed:",[717,718,719],"blockquote",{},[246,720,721,724],{},[253,722,723],{},"Bus over by 20 A"," · 200 A × 120% = 240 A \u003C 200 A main + 60 A PV = 260 A",[726,727],"br",{},"i.e. the allowed busbar load (240 A) is less than main + backfeed (260 A), over by 20 A. The card offers a remediation suggestion — typically a smaller backfed breaker, a higher-rated bus, a supply-side move, or ",[253,730,731],{},"PCS active"," to waive the limit.",[683,734,736],{"id":735},"when-the-gateway-is-the-service-disconnect-whole-home-tesla-gateway-3","When the gateway IS the service disconnect (whole-home \u002F Tesla Gateway 3)",[246,738,739,740,743,744,747],{},"A Tesla Gateway 3 (and similar grid-forming devices) placed ",[253,741,742],{},"upstream of the main service panel"," does not land on a load-side breaker — ",[253,745,746],{},"it becomes the service disconnect and point of interconnection itself"," (a supply-side 705.11 connection per 230.82(6)). For these designs:",[282,749,750,761,776],{},[285,751,752,753,756,757,760],{},"There is ",[253,754,755],{},"no separate load-side tie-in card to fill in."," The interconnection ",[375,758,759],{},"is"," the service connection; the tool derives it from the one-line (the gateway shows as the service disconnecting means).",[285,762,763,764,767,768,771,772,775],{},"You establish it by ",[253,765,766],{},"crowning"," the gateway after you place it: choose ",[253,769,770],{},"\"Make service disconnect\""," (keep the existing panel inline) or ",[253,773,774],{},"\"Back up the existing MSP\""," (re-home the existing panel behind the gateway), then pick the NEC-sized main breaker the tool recommends and confirm service bonding\u002Fgrounding.",[285,777,778,779,782,783,786],{},"An empty ",[253,780,781],{},"\"Grid Tie-Ins\""," list is ",[253,784,785],{},"expected"," here — it is not a missing field.",[683,788,790],{"id":789},"adding-an-islanding-or-backup-device-gateway-3-backup-switch-iq-meter-collar","Adding an islanding or backup device (Gateway 3, Backup Switch, IQ Meter Collar)",[246,792,793,794,797,798,800,801,804,805,809],{},"Islanding \u002F microgrid-interconnect devices are ",[253,795,796],{},"service-region"," equipment. Open the halo on the ",[253,799,425],{}," and add the device toward the service side — ",[375,802,803],{},"not"," from the inverter\u002Fcombiner (which lives on the array side and shows \"No eligible devices here\"). See ",[428,806,808],{"href":807},"#authoring-with-the-halo-the-core-interaction","the halo section"," above.",[265,811,813],{"id":812},"what-to-check-before-continuing","What To Check Before Continuing",[282,815,816,824,827,830,833,840,843],{},[285,817,818,819,823],{},"The graph topology matches the intended array-to-grid path, and the stats bar shows ",[253,820,821],{},[277,822,323],{},".",[285,825,826],{},"Required devices are present: service point, meter, MSP, inverter\u002Fcombiner, disconnects, batteries, junction boxes, PV circuits.",[285,828,829],{},"Service topology (detached vs attached meter-main) is correct.",[285,831,832],{},"Every device has correct New\u002FExisting, ratings, catalog\u002FSKU, OCPD, and location data.",[285,834,835,836,839],{},"Grounding & bonding (SUSE, MBJ, GEC) is complete — no ",[277,837,838],{},"⚠ needed"," badge.",[285,841,842],{},"The tie-in has the correct landing device, method, side, breaker\u002Ftap, and termination confirmation — and the compliance band reads PASS (or the empty-list case is the expected whole-home one).",[285,844,845,850],{},[253,846,847],{},[277,848,849],{},"Required fields · 0 missing"," before you click Next.",[265,852,854],{"id":853},"feeds-next","Feeds Next",[246,856,857],{},"Step 4 (Wire Schedule) consumes the validated graph, device ratings, path devices, tie-in data, and compliance state to auto-generate conductor sizing and the raceway table. If Step 3 is incomplete or invalid, the wire schedule will be incomplete, blocked, or misleading.",[265,859,861],{"id":860},"short-clips","Short Clips",[246,863,864],{},"A short walkthrough of the Step 3 electrical graph:",[246,866,867],{},[868,869],"video",{"controls":870,"muted":870,"preload":871,"style":872,"src":873},true,"metadata","width:100%;border-radius:8px","\u002Fdesign-tool\u002Fclips\u002Fstep-3-electrical-graph.webm",{"title":875,"searchDepth":876,"depth":876,"links":877},"",2,[878,879,880,881,882,883,889,890,891],{"id":267,"depth":876,"text":268},{"id":354,"depth":876,"text":355},{"id":434,"depth":876,"text":435},{"id":494,"depth":876,"text":495},{"id":536,"depth":876,"text":537},{"id":609,"depth":876,"text":610,"children":884},[885,887,888],{"id":685,"depth":886,"text":686},3,{"id":735,"depth":886,"text":736},{"id":789,"depth":886,"text":790},{"id":812,"depth":876,"text":813},{"id":853,"depth":876,"text":854},{"id":860,"depth":876,"text":861},"Build the one-line graph, set device data, grounding\u002Fbonding, the grid tie-in, and read NEC 705 compliance.","md",{},null,{"title":187,"description":892},"9ax4Tv6O-0ca4u10VEXNGD7UkJr355n3bHkzP-iDMsk",[899,900],{"title":183,"path":184,"stem":185,"children":-1},{"title":191,"path":192,"stem":193,"children":-1},1786202577842]