📦 接线盒容积计算器（NEC）/ 装箱数量计算器Box Fill Calculator (NEC Electrical) & Packing Box Count

使用说明与常见问题How-to & FAQ

「接线盒容积计算器（NEC）/ 装箱数量计算器」是什么？What is the Box Fill Calculator (NEC Electrical) & Packing Box Count tool?

两种用法：按美国电气规范 NEC 314.16 计算接线盒需要的容积（导线、接地线、器件、线夹、管接头折算导线数 × 每根导线容积），并和盒子容积比较；或者计算长方体箱子能装多少件同样大小的物品，自动尝试 6 种摆放方向。本地处理。Two uses: work out the volume an electrical box needs under NEC 314.16 (conductors, grounds, devices, clamps and fittings counted as conductor allowances × volume per conductor) and compare it with the box, or count how many identical items fit in a carton, trying all 6 orientations. Processed locally.

如何使用「接线盒容积计算器（NEC）/ 装箱数量计算器」？How do I use the Box Fill Calculator (NEC Electrical) & Packing Box Count tool?

在「接线盒容积计算器（NEC）/ 装箱数量计算器」中，填写「用途」、「最大导线规格」、「进出盒的导线数（不含接地）」、「有无接地线」、「器件数（开关、插座）」等参数，结果会随输入实时计算并显示在下方。In the Box Fill Calculator (NEC Electrical) & Packing Box Count: Fill in "Use", "Largest conductor size", "Conductors entering the box (not grounds)", "Equipment grounds", "Devices (switches, receptacles)"; results are recalculated instantly as you type.

NEC 每根导线的容积是多少？How much volume does NEC give each conductor?

NEC 表 314.16(B)：18 AWG 1.50 in³、16 AWG 1.75、14 AWG 2.00、12 AWG 2.25、10 AWG 2.50、8 AWG 3.00、6 AWG 5.00。本页用最大导线的容积来折算，偏保守。NEC Table 314.16(B): 18 AWG 1.50 in³, 16 AWG 1.75, 14 AWG 2.00, 12 AWG 2.25, 10 AWG 2.50, 8 AWG 3.00 and 6 AWG 5.00. This page uses the largest conductor for every allowance, which is conservative.

哪些东西要折算？What counts towards the fill?

每根进出盒子的导线算 1 根；所有设备接地线合计算 1 根；每个开关或插座算 2 根；盒内线夹合计 1 根；每个灯具螺柱或吊钩算 1 根。完全在盒内的跳线不算。Each conductor entering the box counts 1; all equipment grounds together count 1; each switch or receptacle counts 2; internal clamps count 1 in total; each fixture stud or hickey counts 1. Pigtails that never leave the box do not count.

装箱模式怎么算？How does the packing mode work?

物品按同一方向整齐排列，试遍 6 种朝向，每个方向取 箱长 ÷ 物品长 向下取整后相乘，选件数最多的方案。Items are stacked in one orientation; all 6 orientations are tried, each axis takes floor(carton / item), and the best product is shown.

能举个计算实例吗？Can you show a worked example?

例如在「接线盒容积计算器（NEC）/ 装箱数量计算器」中填 用途 = 接线盒 NEC 容积，最大导线规格 = 14 AWG (2.00 in³)，进出盒的导线数（不含接地） = 4，有无接地线 = 有，器件数（开关、插座） = 1，盒内线夹 = 无，结果区显示：折算导线数：7；所需容积：14 in³ (229 cm³)；明细：导线 4 + 接地 1 + 器件 2×1 + 线夹 0 + 螺柱 0；盒子是否够用：够用（富余 4 in³)；ℹ 按 NEC 314.16(B)：所有接地线合计 1 根；每个器件按 2 根计（以连接的最大导线为准）；线夹合计 1 根；盒内起止的跳线不计。以当地规范和检查员为准。For example, entering Use = Electrical box fill (NEC), Largest conductor size = 14 AWG (2.00 in³), Conductors entering the box (not grounds) = 4, Equipment grounds = Yes, Devices (switches, receptacles) = 1, Internal cable clamps = None in the Box Fill Calculator (NEC Electrical) & Packing Box Count gives: Conductor allowances: 7; Required volume: 14 in³ (229 cm³); Breakdown: Conductors 4 + grounds 1 + devices 2×1 + clamps 0 + studs 0; Box adequate: Yes (spare 4 in³); ℹ Per NEC 314.16(B): all grounds together count as 1; each device counts as 2 (based on the…

哪些输入会被检查？Which inputs are validated?

「接线盒容积计算器（NEC）/ 装箱数量计算器」会检查这些输入——「进出盒的导线数（不含接地）」、「器件数（开关、插座）」：所选方式用到时必须填写，不能为负数；「灯具螺柱/吊钩数」：不能为负数；「盒子容积 in³（可选）」：须大于 0；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The Box Fill Calculator (NEC Electrical) & Packing Box Count checks its inputs — "Conductors entering the box (not grounds)", "Devices (switches, receptacles)": required when the chosen option uses it, cannot be negative; "Fixture studs or hickeys": cannot be negative; "Box volume in³ (optional)": must be greater than 0; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.

有哪些选项可以调整？What options can I adjust?

「接线盒容积计算器（NEC）/ 装箱数量计算器」的设置：「用途」可选 接线盒 NEC 容积、装箱数量（默认 接线盒 NEC 容积）；「最大导线规格」可选 18 AWG (1.50 in³)、16 AWG (1.75 in³)、14 AWG (2.00 in³)、12 AWG (2.25 in³)、10 AWG (2.50 in³)、8 AWG (3.00 in³)等（默认 14 AWG (2.00 in³)）；「进出盒的导线数（不含接地）」默认 4；「有无接地线」可选 无、有（默认 有）；「器件数（开关、插座）」默认 1；「盒内线夹」可选 无、有（默认 无）；「灯具螺柱/吊钩数」默认 0；「盒子容积 in³（可选）」默认 18；「箱内尺寸 长×宽×高」默认 40, 30, 20；「物品尺寸 长×宽×高」默认 12, 10, 8。每次生成结果都按当前设置处理。Settings in the Box Fill Calculator (NEC Electrical) & Packing Box Count — "Use": Electrical box fill (NEC), Packing count (default Electrical box fill (NEC)); "Largest conductor size": 18 AWG (1.50 in³), 16 AWG (1.75 in³), 14 AWG (2.00 in³), 12 AWG (2.25 in³), 10 AWG (2.50 in³), 8 AWG (3.00 in³), etc. (default 14 AWG (2.00 in³)); "Conductors entering the box (not grounds)" default 4; "Equipment grounds": None, Yes (default Yes); "Devices (switches, receptacles)" default 1; "Internal cable clamps": None, Yes…

换算系数准确吗？Are the conversion factors exact?

「接线盒容积计算器（NEC）/ 装箱数量计算器」采用国际单位制（SI）或公认标准中的定义值作为换算系数，结果保留约 10 位有效数字。The Box Fill Calculator (NEC Electrical) & Packing Box Count uses factors defined by the SI or other recognised standards and shows about 10 significant digits.

「接线盒容积计算器（NEC）/ 装箱数量计算器」免费吗？需要注册吗？Is the Box Fill Calculator (NEC Electrical) & Packing Box Count free? Do I need an account?

「接线盒容积计算器（NEC）/ 装箱数量计算器」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Box Fill Calculator (NEC Electrical) & Packing Box Count is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.