- Rated insulation voltage

- Rated maximum operating voltage - Rated frequency - Rated insulation level - Impulse withstand voltage - 1 second withstand current - Peak withstand current - Bus bar rated current

1000 V AC Up to 690 V AC 50 or 60 Hz, +/-5%

3000 V rms (one min. 50Hz withstand voltage) 8 kV peak (1,2/50 micro-sec. wave) Up to 100 kA 220 kA Up to 5000 A

The environment test is carried out by SMERI which is including: High temperature test (70ºC), Low temperature test (-55ºC), Temperature and Humidity test (55 ºC, RH 95%), Salt spray test, Fungus test, Inclination test (±10 º, ±15 º, ±45 º), Vibration test (0-100 Hz, ±5 m/m2) and Enclosure protection test (IPX4)

1.2.1 Internal wiring

All wiring inside the switchboards is of flame retardant types and Ship Class Type approved. They are flexible copper-strand insulated conductors with minimum cross section of 1.0 mm2 (2.5 mm2 For CT) unless otherwise required by certain component manufacturer. For the secondary control circuitry, voltage grade of the wires is >400 V. For power source wires and cables connected to mains, voltage grade of >750 V is used. For data-bus line, the suitable screen-shield multi-core cables are used. All the wires and cables used are of tinplated cu types to avoid oxidation.

The control wires are fitted in slotted cable ducts of flame retardant type to prevent abrasion, cutting of its insulation, excessive motion caused by vibration and for easy maintenance. All internal wires are address marked in each end by use of printed PVC sleeve tubes. As per the component terminal shape, suitable connecting ferrules or sleeves are used on wire and cable ends.