Dialah yang memperlihatkan kepada kamu kilat, untuk menimbulkan ketakutan dan keinginan dan Dialah yang menyusun awan yang berat.

Dan bertasbihlah petir dengan memujiNya, dan malaikat pun lantaran takut kepadaNya, dan Dia kirimkan halilintar (kilat) dan Dialah timpakan kepada barangsiapa yang Dia kehendaki, namun mereka masih membantah tentang Allah, padahal Dia adalah sangat pedih siksaan.
(Surah Ar Ra’ad :12-13)

Rabu, 26 April 2017

Pekerja warga asing maut disambar petir

Pekerja warga asing maut disambar petir
26 April 2017

Seorang pekerja wanita warga Indonesia maut disambar petir ketika menyelenggara landskap di bawah Menara Kawalan Trafik Udara, Jabatan Penerbangan Awam (DCA), Lapangan Terbang Antarabangsa Kuala Lumpur (KLIA) tengah hari semalam.

Ketua Polis Daerah Sepang, Asisten Komisioner Abdul Aziz Ali ketika dihubungi berkata, dalam kejadian kira-kira jam 1 tengah hari itu, mangsa meninggal dunia di tempat kejadian.

Beliau berkata, mayat mangsa ditemukan rakan sekerjanya sebelum memaklumkan kejadian itu kepada majikan.

Mayat mangsa dihantar ke Hospital Serdang untuk bedah siasat, kata Abdul Aziz.

- Bernama

Selasa, 11 April 2017

Houses and high-rise buildings still using flawed lightning protection systems

Houses and high-rise buildings still using flawed lightning protection systems
Tuesday, 11 April 2017

DESPITE living in a country with thunderstorms aplenty and high incidence of lightning strikes, public awareness of lightning protection is surprisingly little and general preparedness is low.

Lightning strikes kill more than a hundred people and injure many more every year.

Not only does it put lives and properties at risk, it can also result in losses and additional operational costs for businesses that may run into millions of ringgit.

In 2004, a lightning bolt shot down a chunk of concrete from the top of a block of apartments in Desa Mentari, Petaling Jaya. Debris rained down on a car parked below but residents managed to run for shelter.

Last July, water supply was cut off for half a million people in Terengganu after lightning damaged a main switch at a water treatment plant in Air Kepong.

In November, lightning was also suspected to have caused a double circuit at the 275kV Kemena-Selangau line to trip, bringing about two power outages within nine hours in Sarawak.

The most recent case saw motorists from Damansara heading towards Klang and Subang Jaya stuck in a frustrating 45-minute crawl after lightning crashed SmartTag readers at the Damansara Toll Plaza, forcing PLUS Highway staff to manually scan cards with hand-held devices.

Another concern is the widespread use of early streamer emission (ESE) rods, which are seen on many rooftops despite being declared a public safety risk in 2005 by the International Conference on Lightning Protection.

This has prompted the Energy Commission (EC) to conduct studies in Sabah and peninsular Malaysia to determine how many buildings are not following the MS IEC 62305 standards for lightning protection.

EC electrical safety regulation director Mohd Elmi Anas said the exercise was initiated after technical experts expressed alarm that 90% of buildings, including those belonging to government agencies, had not conformed to specifications.

This was in spite of the fact that a circular on lightning protection standards was issued in 2011 – the same year that three wards at Hospital Putrajaya caught fire after a lightning strike.

“Eighty per cent of buildings in the Klang Valley have physical scars caused by lightning strikes,” said lightning research and development consultant Hartono Zainal Abidin, who has 35 years of experience in the field.

Studies showed that buildings with these rods had been struck and damaged by lightning bolts, proving their ineffectiveness.

Another obvious flaw seen on most houses and high-rise buildings is the sight of a single lightning rod protruding from the highest point.

This was generally believed to be able to offer umbrella protection for the entire structure, which Hartono said was not true.

The “Guide On Lightning Protection System For Buildings” published by the EC states that the correct method is to have lightning rods placed at corners and outer ridges of a rooftop.

Positioning of the rods also depends on building size, structure and the presence of rooftop equipment such as staircases, antennas and ventilation units.

The guideline lists four other major components to be looked into. This includes network conductors to carry the lightning current safely towards ground.

As a general rule, each down conductor must end in an earthing electrode which can consist of conductors (at least three) in a crow’s foot layout buried at least 0.5m deep.

It also asks for surge protection devices to be placed at main and distribution switchboards.

The EC study, expected to be completed by the end of this year, is viewed as an important step towards enhancing safety measures as lightning strikes have been known to cause property damage running up to millions, not to mention production downtime and expensive repairs.

“Voltage surge from a lightning strike can cause short circuits resulting in premature failure or total loss in equipment linked to plumbing, air conditioners, heaters, ventilation and wiring,” said Tenaga Nasional Bhd (TNB) research power quality and energy efficiency specialist Mohamed Fuad Faisal.

Even if power surges caused by lightning are not severe enough to crash an electronic device immediately, rapid overheating followed by gradual cooling in the wiring or circuit can result in a condition known as “electronic rust.”

Known as the “silent killer” of electronic devices, it can cause enough damage to bring down entire sections of a power grid over time.

Between 2014 and 2016, TNB received 21 complaints of electronic rust caused by voltage surges.

Mohd Elmi advises owners of buildings completed before 2007 to redo their lightning protection system (LPS) assessment.

Though EC has not carried out any enforcement, under Section 50e of the Electricity Supply Act 2015, building owners found guilty of not following Malaysian standards are liable to a maximum fine of RM200,000 or two years’ jail.

Malaysian Electrical and Electronics Association council member Lim Kim Ten said the EC study would have far-reaching consequences for building owners as they would have to bear the costs of changing their LPS if found to be non-compliant with the MSC IEC standard.

“The concept is like buying insurance. You may not use it but you must buy it.

“Ideally, building owners should be given a grace period or have a limitation be put on the law applying to structures built after a certain year,” he said.

But Lim stressed that in view of the frequency of lightning occurrences in Malaysia, there must be more awareness among building owners.

“In countries such as Japan, South Korea and China, an LPS system adds more value to a building,” he said.

Building owners are advised to deal only with LPS vendors that are certified by the EC.

For checking purposes, they can call up the regional offices that will have a list of approved companies in their registry.

Rabu, 15 Mac 2017

Weatherman: Be careful when outdoors ‘Lightning can strike anytime’

Weatherman: Be careful when outdoors ‘Lightning can strike anytime’
15 March 2017

PETALING JAYA: Check weather conditions before embarking on outdoor activities because lightning can strike anytime throughout the year, the Malaysian Meteorological Department (MetMalaysia) advises.

Most lightning deaths and injuries occur when people are caught outdoors, added the department.

Thunderstorms are most likely to happen during inter-monsoon seasons, between April and May, and October to November.

Over land, thunderstorms usually develop in the afternoon and evening. Over sea, they usually strike at night, MetMalaysia said on its website.

Malaysia has one of the highest number of lightning strikes in the world.

It gets more than one million strikes a year, said Universiti Putra Malaysia’s Centre for Electro­magnetic and Lightning Protection Research (CELP) director Prof Dr Mohd Zainal Abidin Ab Kadir.

“The first principle is to take precaution by looking at the weather forecast before going for outdoor activities. And in the park, when the thunder roars, people should go indoors.

“If you see a flash, you can estimate how far the lightning is based on the time lapse between the flash and the sound of thunder and divide it by three.

“This will give a rough estimation of the distance of the lightning in kilometres,” said Dr Mohd Zainal Abidin who is also UPM’s Faculty of Engineering deputy dean (research and innovation).

He said data from the CELP showed that lightning killed 112 people and injured 156 people in Malaysia from 2008 up to Tuesday.

On Sunday, a couple, believed to have been struck by lightning, were found dead in a park at Jalan Kenari 10, Bandar Puchong Jaya.

The man identified as Yee Boon Koo, 59, and the woman Ooi Lee Chen, 57, were found lying on the ground, with the man bleeding from the head.

Jumlah mangsa panahan petir tinggi

Jumlah mangsa panahan petir tinggi
29 Ogos 2015

Kuala Lumpur: Bilangan mangsa panahan petir di negara ini boleh dikatakan agak tinggi dengan jumlah 230 orang dalam tempoh tujuh tahun lalu berbanding negara lain.

Pengarah Kajian Pusat Kecemerlangan Perlindungan Kilat (CELP) Universiti Putra Malaysia (UPM) Prof Madya Dr Mohd Zainal Abidin Ab Kadir berkata, penemuan itu adalah berdasarkan kajian yang dilakukannya sejak 2008 sehingga dua minggu lalu dan ia dibentangkan menerusi satu mesyuarat khas Pergerakan Negara-Negara Berkecuali (NAM) mengenai petir di Zambia, baru-baru ini.

Katanya, jumlah mangsa terbabit sama ada maut atau mengalami kecederaan adalah disebabkan keadaan di Malaysia lebih banyak terdedah kepada panahan petir.

“Kajian yang dibentangkan itu melihat terdapat 230 mangsa petir dalam tempoh tujuh tahun dan sudah tentu ia dianggap tinggi. Apa yang dapat dilihat juga, berdasarkan kes yang dilaporkan berlaku di negara ini juga terdapat beberapa insiden membabitkan lebih daripada seorang.

“Ia sekali gus menyumbang kepada peningkatan bilangan mangsa akibat panahan petir. Jika kita ambil contoh di Amerika Syarikat (AS), nisbah kematian mangsa akibat panahan petir ialah 0.6 per satu juta penduduk,” katanya ketika dihubungi Harian Metro, semalam.

Isnin, 13 Mac 2017

Suami isteri maut dipanah petir

Suami isteri maut dipanah petir
13 Mac 2017

PUCHONG – Sepasang suami isteri maut selepas dipercayai disambar petir ketika berjoging di sebuah taman permainan di Jalan Kenari 10, Puchong Jaya di sini semalam.

Mangsa, Yee Boon Koo, 59, dan isterinya, Ooi Lee Chen, 57, ditemui dalam keadaan tertiarap di laluan pejalan kaki oleh seorang lelaki kira-kira pukul 6 petang.

Pemangku Ketua Polis Daerah Serdang, Superintendan Lee Wai Leong berkata, ketika ditemui, kedua-dua mangsa dalam keadaan terbaring dengan salah seorang daripada mereka mempunyai pendarahan pada kepala.

“Orang awam yang menemui kedua-dua mangsa kemudian menghubungi pihak ambulans.

“Kedua-dua mangsa yang merupakan pesara swasta bagaimanapun disahkan telah meninggal dunia di tempat kejadian oleh pasukan perubatan Pusat Perubatan Universiti Malaya yang tiba tidak lama kemudian,” katanya dalam satu kenyataan di sini semalam.