Shenhai e fakamoʻoni fakaʻauha
Ko e maama ʻo e fakamoʻoni hono naunau ko ha faʻahinga maama ia ʻoku fakataumuʻa ki he maluʻi ʻo e fakaʻauha, fakaʻilongaʻi ʻaki ha “ʻEke” fakaʻilonga. ʻOku maʻu ʻe he hono naunau ko ʻeni ha ngaahi koloa sila pau mo ha ngaahi founga maluʻi kehe ʻi honau fale, ʻo hange ko hono tuʻutuʻuni ʻe he ngaahi tuʻunga moʻui fakafonua. ʻOku ʻikai tatau ia mo e ngaahi maama ʻoku ʻikai ke ʻi ai ha fakamoʻoni, ʻoku nau muimui ki ha ngaahi fie maʻu makehe:
1. Faʻahinga ʻo e fakamoʻoni fakaʻauha, Maaka, and Temperature Group: These are defined by national standards.
2. Types of Explosion-proof Protection:
There are five main types – flameproof, tupulaki e malú, malohi lelei, ʻikai ke ʻi ai ha meʻa, and dust explosion-proof. They can also be a combination of these types or be of a composite or special kind.
3. Maluʻi ʻo e ʻuhila:
Classified into three categories – I, II, mo e III. The purpose is to prevent electric shocks from accessible parts or conductors at different potentials, which might ignite fakafepakiʻi Maʻuʻanga Fakamatala.
Taipeʻi ʻa e I: Based on basic insulation, conductive parts that are normally non-live and accessible are connected to a protective earth conductor in the fixed wiring.
Taipeʻi ʻa e II: Uses double or reinforced insulation as safety measures, without fakavaʻe.
Taipeʻi ʻa e III: Operates on a safe voltage not exceeding 50V and doesn’t produce higher voltages.
Taipeʻi 0: Relies solely on basic insulation for protection.
Most explosion-proof lighting fixtures fall under Type I, with a few being Type II or III, such as all-plastic explosion-proof lights or explosion-proof flashlights.
4. Tuʻunga maluʻi ʻoku ʻoatu:
Various protection methods for the enclosure are used to prevent the ingress of dust, solid objects, mo e vaí, which could lead to sparking, short-circuiting, or compromising the electrical insulation. Characterized by “IP” followed by two digits, the first digit represents protection against contact, solids, or dust (kamata mei he 0-6), pea ko hono uá ki he vaí (kamata mei he 0-8). As sealed fixtures, explosion-proof lights have at least a level 4 dust protection.
5. Material of Mounting Surface:
Indoor explosion-proof lights might be mounted on ordinary combustible surfaces like wooden walls and ceilings. These surfaces must not exceed a safe mafana ʻo e ʻea due to the light fixtures.
Based on whether they can be mounted directly on ordinary combustible materials, they are categorized into two types.
Summary – “How are explosion-proof lights different from regular lights?”: Regular lights are used in non-hazardous locations without velangofua kasa pe efu. Unlike explosion-proof lights, they lack explosion-proof grades and types. Regular lights mainly serve illumination purposes, while explosion-proof lights not only provide illumination but also offer explosion protection, ensuring the safety of personnel and preventing property damage.