Shenhai e fakamoʻoni fakaʻauha
Ke fakapapauʻi ʻoku malu mo ola lelei hono fokotuʻu ʻo e ngaahi maama ʻo e fakamoʻoni fakaʻauha, it’s crucial to consider the following points while selecting the electrical wiring:
1. Fili ʻo e Feituʻú:
ʻOku totonu ke tuʻu ʻa e ngaahi feituʻu ʻi he ngaahi feituʻu ʻoku siʻisiʻi ai e fakaʻauha pe mamaʻo mei he ngaahi maʻuʻanga ignition.
2. Founga fakauaea:
ʻI he ngaahi ʻatakai fakafepaki, the primary wiring methods include using explosion-proof steel conduits and cable wiring.
3. Fakamavaheʻi mo Sila:
For circuits and protective conduits, ngaahi uaea, or steel pipes passing through walls or slabs separating different explosion hazard levels, non-combustible materials should be used for tight sealing.
4. Choice of Conductor Material:
For areas categorized under explosion hazard level 1, copper wires or cables should be used. In scenarios with severe vibrations, multi-stranded copper core cables or wires are recommended. Aluminum core power cables are not suitable for underground coal mines.
In explosion hazard level 2 ngaahi ʻātakaí, power lines should be made of aluminum wires or cables with a cross-sectional area greater than 4mm², and lighting circuits should have a cross-sectional area of 2.5mm², placed above the aluminum core wires or cables.
5. Allowable Current Carrying Capacity:
Ki he souni 1 mo e 2, the chosen cross-sections of insulated wires and cables should have a conductive capacity not less than 1.25 times the rated current of the fuse and the setting current of the long-time overcurrent release of the circuit breaker.
The permissible current capacity for branch circuits of low-voltage squirrel cage asynchronous motors should not be less than 1.25 times the rated current of the motor.
6. Electrical Circuit Connections:
1. The intermediate connections of circuits in zones 1 mo e 2 must be near explosion-proof junction or connection boxes compatible with the hazardous environment. Fakasouni 1 should use flameproof junction boxes, while zone 2 can utilize tupulaki e malú type junction boxes.
2. If aluminum core cables or wires are selected for zone 2 circuits, the connections must be reliable to facilitate easy installation and maintenance by users.
This guidance aims to assist in selecting the appropriate wiring for installing LED explosion-proof lights, fakapapauʻi ʻa e malu mo e ngaue fakatouʻosi.