水草情迷

Another piece of info from:
http://www.arrl.org/files/infoserv/tech/rfi-elec.txt
which talk about radio freq interference.
quote:
"Even with everything in a powered circuit turned off and unplugged, it's
possible - though highly unlikely - that faulty wiring may continue to power
the noise source. For example, a lighting switch installed in the fixture
neutral lead (incorrect and dangerous wiring) instead of its hot lead may
allow a hot-to-ground gap in the fixture to receive ac even with the switch
turned off (see Figure 3 description)"

So it is pretty clear that switch should be on the L wire, so that when off, the appliance is totally cut off from the supply.

To 雪山飛狐:
Those ballast for 11W PL tube are not electronic ballast, although u don't find the starter on those type of light.
I heard a friend of mine told me that the starter function is built in with the tube.
Those ballast (magnetic) are inefficient and VERY hot. My PML light(2 11W tubes) is very hot too, esp near the ballast position. I plan to change them to 27W, with electronic ballast.

I think the PML light cooked my tiger shrimps b4 !!

YES! 我讀左六年電工同電子與電學 ! 讀電第一樣要學既都係安全 !
開關掣安裝係正極/火線 "L" 都係好基本既安全要點!
而呢d 咁簡單既交流電路應該唔會有咩特別設計 !
其實好多電器產品本身設計已經有問 ! 有d都仲要回收/禁售 !
http://www.emsd.gov.hk/emsd/chi/pps/electricity_epr.htm
好似呢個list 咁...都有唔少例子!

講開黑面神，其實條孖仔來：一個在福濤，一個在川河！，要炳的要問清楚大細呀，細果個先係黑面神！買PML PL管最好在卡奇，佢會即場試；不過有次我在川河買完番屋企開唔著；佢地都好好幫我換番！奉勸一句，若真的要幫親這集團，我認為去川河會比較好，而賓流還可以。

The one 川河 is the small 孖, he is better

Hi-wwhk
你唔講真係唔知.
原來佢o地舖與 舖之間的關係o甘密切,包括sales的血緣關係(因好多個都差不多樣,連格都似)
唔怪得好似o吾憂做o甘款!
仲可能D sales,禍害魚街,欺壓善良魚友!!!

對唔住呀!!!
親愛的super兄,
小弟因為火遮眼,受斑金毛Sales唔少氣,所以錯手落重藥!
不過小弟有過不情之請,閂了一段文後,唔好寫?"罪不及父母.....妻兒"一段好嗎?求求您0拉!
人0地睇唔見以為小弟講o左D 廣東最勁的"粗口",搞到小弟無面見人!
謝謝

Why feel sorry ar????

THe sales are so look alike, sometime i thought they part-time work in different shop!

都係唔講咁多
你們大家繼續 DIY 吧...
但死了千萬不要報夢給我聽呀!

咁又 唔好 死死 聲....
總之 唔識/識d唔識d就唔好搞 lor~
有無牌先搞得就好難講 , 無牌都唔一定會比有牌差 , 識 =/= 有牌
大把 玩無線電/音響既人 都無電牌啦 , 佢地改既機 , diy 既設備 都比支燈複雜 !


最重要就係注意安全 !

alan2002,

你refer的圖當然是非常標準的接線方式, 但只是應用在一般的照明電器上, 尤其是那些開關掣設在燈具以外的電器(如入牆掣)

當電流經過火牛後, 以光管為例, 電流由13A大幅下降至約200mA(0.2A), 直接觸及的危險性已大幅下降.

要知道, 魚缸燈具開關掣設在燈具之內, 加上用具時常放在近水或濕的地方, 更有可能被水濺濕, 若開關掣不幸漏電, 開關掣設在"L"線, 你會觸及一個220V, 13A的電流, 相反若設在N線, 你只會觸及一個220V, 0.2-0.3A的電流.

若燈具原本的開關掣設在N線, 其設計只預計一個0.2-0.3A的電流通過, 開關制防漏電裝置或會較差, 你將開關制改往"L"線真是非常危險的.

(註:我不是叫大家若見到燈具的原裝開關設在"L"線的, 要改往"N"線, 我只是叫大家切勿自以為是自行更改電器的線路.)

現實生活中, 如大家細心留意, 有很多電器的開關是設在火牛之後的, 如:宜家及實惠的夾檯11W PL 燈, 手提式電腦, 打印機, 超薄顯示屏, 傳真機等等, 我的NISSO套缸燈也是, 它們的特點都是開關掣附設在電器內的.

如果你仍舊堅持開關制必須放在"L"線上, 你可在電器外插蘇位加一個開關掣, 日後以它作為開關便便成了, 但千萬千萬不要更改電器內的線路!!



3K:

以你所謂6年咁大把的電乜電物學歷, 又知道安全的重要, 又知道有咁多問題產品, 其中更包括了那些知名牌子的電器產品, 他們屬下大把資歷及經驗比你深得多的人, 尚且生產出一些問題產品, 你就更應明白自己的知識是很有限, 我也一樣, cyber的嚴肅語, 我們得聆聽, 緊記在心裡, 不要掉以輕心, 還是放下的那短短六年的學歷尊嚴吧! 你在那裡自誇, 就在那裡摔倒, 希望你不要介意我的不客氣話.

ttc :
我明白你既意思 , 其實我想講既唔你你諗既意思 ! 其實我係想講出咁年 , 都無講過呢個情況 ! 所以就以基本開始 !
其實而家諗返 呢d燈既出產地 , 例如大陸 , 臺灣 , 日本 都仲係用 2 腳 , 都係無極性設計 , 即係無分 L , N . 即係開關係 L 定 N 都可以 .
改唔改設計就 ...... 就自己決定 !

To tcc:
I didn't actually rewire the switch, just simply change the magnetic ballast to e-ballast. The original switch on both cyberaqua and PML are on the L wire. I specially checked for the ground to see whether the ground from the plug is actually connected to the casing. In both cases, they are, which is good.
Anyway, i think we all understand the danger of electricity, and your inputs are very very useful to everyone. Thanks.