Temperature Rise Calculation

Project details

Company name Person's name Phone number Tier name / number IEC TR 60890 calculates temperature rise per tier. Use "+ Add another tier" after calculating to do the next one — your company details carry over automatically.

Enclosure dimensions & conditions

Width (mm) * Height (mm) * Depth (mm) * Ambient temperature (°C) * Highest air temperature expected around the switchboard's location. Operating / max permissible temperature (°C) * The lowest maximum operating temperature rating among the components fitted inside. Load factor (0–1) * Ratio of actual expected current to rated current — typically 0.7–1.0.

Installation type

1. Single Enclosure, Free-Standing on all sides 2. Single Enclosure for wall mounting 3. First or Last enclosure in a suite, free-standing 4. First or Last enclosure in a suite, for wall mounting 5. Enclosure within a suite, free-standing 6. Enclosure within a suite, for wall mounting 7. Enclosure within a suite, for wall mounting, with covered roof surface

Not sure which installation type applies? Click for a guide

Each layout below shows which sides of the enclosure get full cooling credit. Blue = free / exposed side. Grey = against a wall or a neighbouring enclosure (reduced cooling credit).

1. Single Enclosure, Free-Standing on all sides

2. Single Enclosure for wall mounting

3. First or Last enclosure in a suite, free-standing

4. First or Last enclosure in a suite, for wall mounting

5. Enclosure within a suite, free-standing

6. Enclosure within a suite, for wall mounting

7. Enclosure within a suite, for wall mounting, with covered roof surface

Ventilation

Ventilation type * Area of cross-section opening (cm²) * No. of horizontal partitions

Component (switchgear) watt-loss details

One row per device type. "Qty" is the number of identical devices of that rating.

Description	Make	Rated current (A)	W / pole	Qty

Busbar watt-loss details

This panel has a busbar

Description	Size (mm²)	Runs / phase	Input current (A)	Length (m)

Cable watt-loss details

Cable losses use the "spaced horizontally in free air" current rating.

This panel has cable(s)

Description	Size (mm²)	Runs / phase	Rated current (A)	Length (m)

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