業務用ランドリー設備の電線サイズ選定ガイド
// 洗濯脱水機、乾燥機、ロールアイロナー、加熱器、ランドリー盤を NEC、電圧降下、IEC で確認します。 //
洗濯脱水機、乾燥機、ロールアイロナー、加熱器、ランドリー盤を NEC、電圧降下、IEC で確認します。 The first step is always the nameplate: voltage, phase, MCA, MOCP, kW, motor current, conductor material and installation limits.
汎用表ではなく、各機械の銘板から始めます。
許容電流、端子温度、連続負荷、モーター、電圧降下を別々に確認します。
208 V の長距離回路では、許容電流を満たしてもサイズアップが必要な場合があります。
乾燥機、インバーター付き洗濯機、アイロナー、補助ヒーターを分けて判断します。
208 V dryer, 48 A, 145 ft
6 AWG copper is a starting screen, but 4 AWG may be required for a 3 percent voltage-drop target.
要約
- 汎用表ではなく、各機械の銘板から始めます。
- 許容電流、端子温度、連続負荷、モーター、電圧降下を別々に確認します。
- 208 V の長距離回路では、許容電流を満たしてもサイズアップが必要な場合があります。
- 乾燥機、インバーター付き洗濯機、アイロナー、補助ヒーターを分けて判断します。
- IEC案件では IEC 60364-5-52 と IEC 60364-4-43 を確認します。
commercialLaundryWireSizingPage.definitionsTitle
MCA
MCA is the minimum circuit ampacity used to size branch-circuit conductors.
MOCP
MOCP is the largest overcurrent device allowed by the equipment instructions.
Continuous load
A continuous load can require 125 percent sizing when it runs 3 hours or more.
commercialLaundryWireSizingPage.workflowTitle
1
Read every equipment nameplate and installation manual.
2
Separate resistance heat, motor, VFD, control and support loads.
3
Select conductors with NEC 310.16 and terminal limits from NEC 110.14(C).
4
Check appliance and motor rules in NEC 422 and NEC 430.
数値例
208 V dryer, 48 A, 145 ft
Replace these values with real nameplate data.
6 AWG copper is a starting screen, but 4 AWG may be required for a 3 percent voltage-drop target.
480 V washer extractor, 27 A MCA
Replace these values with real nameplate data.
Start around 10 AWG copper if derating and terminals allow, then verify VFD input and 40 A MOCP.
120 A continuous ironer
Replace these values with real nameplate data.
120 A x 125 percent = 150 A basis before conductor selection where continuous-load rules apply.
負荷比較
| Equipment | Load | Code | Initial conductor | Field check |
|---|---|---|---|---|
| Electric dryer;208-240 V, 40-80 A;NEC 422 / 310.16;8-4 AWG Cu;Check duty, terminals, and voltage drop past 100 ft. | Washer extractor;480 V 3-phase, 15-40 A;NEC 430 / IEC 60364;12-8 AWG Cu;Confirm VFD input current and short-circuit rating. | Flatwork ironer;60-150 A heat + motors;NEC 422 / feeder rules;6 AWG-1/0 Cu;Treat heat as high-duty load. | Booster heater;30-125 A support load;NEC 422 / 424;10-1 AWG Cu;Check continuous operation during wash cycles. | Laundry feeder;100-600 A mixed loads;NEC 215.2 / 220;Calculated feeder;Check neutral, grounding, panels, and voltage drop. |
主な規格参照
業務用ランドリー設備の電線サイズ選定ガイド: NEC 110.14(C), 210.19(A), 215.2(A), 310.16, Article 422, Article 430 and IEC 60364-5-52 are checked separately. National Electrical Code, IEC 60364 and three-phase electric power are the main reference entities for this design.
NEC 422
業務用ランドリー設備の電線サイズ選定ガイド: NEC 110.14(C), 210.19(A), 215.2(A), 310.16, Article 422, Article 430 and IEC 60364-5-52 are checked separately. National Electrical Code, IEC 60364 and three-phase electric power are the main reference entities for this design.
NEC 430
洗濯脱水機、乾燥機、ロールアイロナー、加熱器、ランドリー盤を NEC、電圧降下、IEC で確認します。
NEC 210, 215, 220, 310
洗濯脱水機、乾燥機、ロールアイロナー、加熱器、ランドリー盤を NEC、電圧降下、IEC で確認します。
IEC 60364 / IEC 60228
IEC案件では IEC 60364-5-52 と IEC 60364-4-43 を確認します。
現場例
- A 208Y/120 V laundry had six 48 A dryers, four 22 A washer extractors, a 36 A booster heater and small 120 V controls. The farthest equipment was 155 ft from the panel.,The revised design moved distribution closer, upsized two long dryer circuits to 4 AWG copper and separated VFD circuits from high-heat circuits. The lesson is that voltage drop can govern after ampacity passes.
- Using a residential dryer rule.
- Ignoring MCA and MOCP.
- Using 90C insulation ampacity as the final value.
- Forgetting raceway derating.
- Skipping voltage drop on long 208 V heat loads.
FAQ
What conductor is common for a 60 A dryer?
6 AWG copper is common, but 4 AWG may be needed for 120-150 ft runs or derating.
Are washer extractors motors or appliances?
Use the nameplate MCA/MOCP first, then review NEC 430 for motor and VFD details.
What voltage drop target is practical?
Many designs use about 3 percent branch and 5 percent total, 6 V at 208 V is already 2.9 percent.
Can several dryers share one feeder?
Yes, when simultaneous load, neutral, grounding and overcurrent protection are calculated.
How does IEC differ?
IEC projects use metric conductor sizes and IEC 60364-5-52 installation methods, grouping and voltage-drop checks.
When should conductors be upsized?
Upsize for voltage drop, ambient correction, conductor-count derating, terminal limits or future replacement.
ランドリー盤を確認しますか？
Use the calculators for a first screen, then contact us for long runs, dense raceways, mixed voltages or high-duty equipment.