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Thread: cutout switches
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4th May 2011, 11:54 PM #1
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cutout switches
I have just bought a bandsaw. It has an On switch and an Off switch.
However the Off switch does not respond to a loss of power, and is actually quite tough to manually activate.
Even my dust extractor system has a zero volt kill switch.
Is this BS switchgear legal?Nick
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5th May 2011, 08:28 AM #2
switchgear
Hi, Carbatec also uses that system, at least on some benchsaws; it is bloody dangerous, to say the least...if the overload switch kicks in, when you reset, it starts with no warning!
Bad recipe for any fingers close by!
We have one of those in our club, glad to report it is being thrown out soon!
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5th May 2011, 09:57 AM #3
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hmm...so it is legal, even though pretty bad. I have old gear that has no cutout switch and my problem was brief power outages of maybe 5 seconds or so. So _really_ dangerous.
I think I will change this one.Nick
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8th May 2011, 12:14 PM #4
It's interesting to note that even the humble Triton was fitted with a safety switch when sold in the UK. Unfortunately we are under regulated in the hobby tool market, if those items were sold into schools or industry they would need to be retrofitted with a No Volt Release switch to comply with OH&S rules.
Regards
Gragame
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8th May 2011, 03:32 PM #5
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Yeah sometimes EU is a bit granny, but I really was surprised that this one got through here, these days. Once I used a machine with the "proper" switch, I would not happily go away from them.
Thanks for the pointer on the NVCO switches.Nick
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26th May 2011, 09:55 PM #6
from an electrical regulatory point of view I do not believe there is any requirement that I know of for a DOL starter (no violt switch) on any equipment.
Any requirement in an industrial workplace will come under OH&S....but I do not believe there is a specific legeslative requirement.
I would be very surprised to see such a machine in any caring workplace with out one though.
It would come very high on the list in any risk assessment.
They are easy enough to obtain and straight forward to fit.
cheersAny thing with sharp teeth eats meat.
Most powertools have sharp teeth.
People are made of meat.
Abrasives can be just as dangerous as a blade.....and 10 times more painfull.
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30th May 2011, 09:14 PM #7
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My bandsaw is in the same boat. Anyone know of a good source for a reasonably priced switch?
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30th May 2011, 11:23 PM #8
Almost any electrical wholsaler should be able to supply... but..I got my last one from Garry Pye as a jet spare part.
cheersAny thing with sharp teeth eats meat.
Most powertools have sharp teeth.
People are made of meat.
Abrasives can be just as dangerous as a blade.....and 10 times more painfull.
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31st May 2011, 11:55 AM #9
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31st May 2011, 12:43 PM #10
Oils ain't oils,
Hi
Let's be clear there are many types of switches. A true safety switch a.k.a Direct Online Starter has a contactor or relay that ensures the the switch only works when there is power available i.e. No Volt Release.
Other safety switch look alikes are usually just on - off switches adapted with a mushroom head on the stop or a paddle as per the Triton version, some have a latching off button. In some applications this is all that is needed e.g. dust extractors. However, IMHO true NVR switches should be used in any fixed cutting application, router tables, saw benches etc.
Most DOL starters also have a built in overload protection, which realy isn't needed where the motor has its own protection
I hope that this clarifies the situation a little.
Regards
Grahame
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31st May 2011, 01:06 PM #11
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1st June 2011, 08:30 PM #12
Last time I looked, RS components had 240V 10A no volt release assemblies for about $35 and a similar assembly as a spare part for an MC900 wood lathe from Hare and Forbes was $20. Both are the familiar green and red button in black housing with clear rubber over the top to keep a bit of the dust out.
Hope this helps a bit.Cheers,
Shannon.
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1st June 2011, 11:44 PM #13
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WooHoo! Ok. Thanks. I was trying to replace a smashed one on an extractor from timbecon and said they had none
Nick
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1st June 2011, 11:46 PM #14
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OK Both dem sites is powful big. Any narrowin? I mean u dun looked an all
Nick
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4th June 2011, 10:14 PM #15
Yeah the RS site is huge. Farnell are about the same, they must spend so much $ keeping it up to date.
The page of no volt switches they carry is here:
RS Australia | World Leading Distributor of Electronics, Electromechanical and Industrial Components
Beware that they do stock some 115V switches which are NOT suitable for Australian (240V) supply.
These are the two I was looking at:
Attachment 172151
$33 ex GST
EICHOFF | Relays, Switches and Indicators | Switches | Push Button Switches | Switch Disconnectors - Fuses |3251-20-01/52
Attachment 172152
$37.60 ex GST
EICHOFF | Relays, Switches and Indicators | Switches | Push Button Switches | Switch Disconnectors - Fuses |3251-21-01/52
I see that the clear dust cap I mentioned was on one of the 115V switches so it would be no good.
The smaller fifth lug on that first switch is for adding in extra safety/convenience stop switches.
Do me a favour and have a chat with a registered repairer or sparky and they will be able to give you the final yay or nay. I can show you where to shop but I can't help you wire it up, sorry.
Good LuckCheers,
Shannon.
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