Insulation Coordination Studio — Engineering Design Tools

1. Electrical & Voltage Inputs

Circuit Pair Type (?)

Vrms Working (V) (?)

Vpeak Working (Vpk) (?)

Mains Nominal (Vac) (?)

OVC Category (?)

Switching Freq (kHz) (?)

2. Environment & Material

Pollution Degree (?)

Material Group (?)

Altitude (m) (?)

Design Margin (%) (?)

Analysis Results

Clearance

Required (Base): 3.00 mm

Req @ 2000m: 3.00 mm

Actual Path: 5.00 mm

Target (+10%): 3.30 mm

PASS

Creepage

Table Basic: 4.00 mm

Req (REINFORCED): 8.00 mm

Actual Path: 13.00 mm

Target (+10%): 8.80 mm

PASS

Derived Context

Insulation Grade: REINFORCED
Impulse Voltage: 4000 Vpk (Base: 2500 Vpk)
Altitude Factor (k_alt): 1.00x
X_min Threshold: 1.00 mm

Engineering Warnings

⚠️ Switching frequency (65 kHz) > 30 kHz: Check high-frequency clearance tables (IEC 60664-4 / IEC 62368-1 Table 11).

3. 2D Cross-section & Geometry Studio

Horizontal Distance (D) mm

Min to PASS: 8.80 mm

Slot Width (W) mm

Min to count depth: 1.00 mm (X_min)

Slot Length Eff (mm)

How It Works (IEC 60664-1 & IEC 62368-1)

⚡

Clearance & Impulse Voltage

d_clr = f(U_imp, OVC) · k_alt

Shortest distance through air to prevent electrical flashover from transient overvoltages (IEC 60664-1 Table F.2). Multiplied by altitude factor k_alt for installations > 2000m.

Creepage & CTI Material Group

d_crp = f(V_rms, PD, Material Group)

Shortest distance along solid insulation surface to prevent tracking and degradation (IEC 60664-1 Table F.4). Doubled (2×) for Reinforced Insulation.

✂️

Groove Threshold (X_min)

W ≥ X_min (0.25 / 1.00 / 1.50 mm)

Grooves or slots with width W < X_min are bridged by pollution and their depth is ignored. If W ≥ X_min, depth counts towards Creepage.

🛡️

Barrier Rib & Cemented Joint

d_crp = D + 2 · H (if cemented)

A cemented insulating rib adds 2×H to the surface creepage path. If uncemented, the joint is considered unbonded and adds no creepage (d_crp = D).

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