Boutelje extractor warning

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Grant

Staff member
Founder Member
Platinum
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Do you also earth your stainless steel bench top ?
Yes in the UK that would be earth bonded, as would the copper pipes carrying the water !!! Unless it was in an area of earth free bonding, but then everything would be at the same potential.

Interesting take on the rules.
I think from what you have described a tad over reaction
Double insulation protects the user of the appliance from an electrical shock by preventing any possibility of the external casing becoming live (the live wire can not touch the casing even if wires inside become loose), thus eliminating the need for an earth connection. The two layers of insulation are:
  • First insulation: Insulating electrical cable from the internal component of the appliance.
  • Second insulation: Insulating internal metal part which could become live from the external casing.
It sounds like the 2nd insulation is not sufficient in this case.

However, according to UK electrical regs you MUST NEVER earth a double insulated appliance.

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I have no idea how these translate to NZ regs as I have not done the qualification cross over here.
 
111
48
New Zealand
Experience
Commercial
Just off the top of my head some differences between UK and NZ
We use a different earthing system. In NZ we drive earth stakes wheres in the UK the earth comes in with the mains. To the consumer not much difference. The UK uses 13amp fused plugs. This is mainly due to the use of ring circuits for power outlets. NZ uses radial circuits

You only need to earth a metal sink or shower tray if copper pipes are used. Most modern houses use plastic pipes

RCDs are mandated in domestic installations (not required in commercial or industrial) not sure what the current UK rules are
 
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8,432
4,863
maungaturoto
Experience
Commercial
A high inertia load such as a spin float, extractor or any other machine running at high speed that has a bit of weight behind it can take a long time to ramp down if the power is turned off. If the machine is on fire it needs to be stopped fast. Using mechanical breaks to stop the machine dead can cause structural damage. Using the dynamic brake is the best way

If the fire is an electrical fire(ie short circuit or overload) the circuit electrical protection will cut the electrical supply. As machines get bigger temperature sensors are used to monitor the likes of bearing temps, winding temps etc.

Many large industrial switch boards are fitted with arc flash sensors and ultra sensitive smoke detectors

This all costs money. For the value of a spin float or extractor all the extra protection is not needed.

Another good braking system is DC injection breaking.

well i fitted the extra earth while having my morning coffee. so that little job is done.

interesting that one extractor has the e-stop kill the power while the other has it trip the VSD.

with the spin float i have yet to go through and check everything. originally the brake resistor was not even set which caused issues.
i suspect the deceleration is not well set but i have not checked it yet. it takes a long time to stop. i'm still going through the manual as that vsd is a lot different to the others.

but there is a practical issue to keep in mind.
when things go wrong you want to be able to hit the button and get out of there.
you don't want to stay and wait for it to stop before turning the power off.
especially as the spin float gets the shakes when slowing down and the stand is rather flimsy built.

dc braking works well, something i added to the extractors programming and got rid of the "throw it in reverse" hack braking setup.
 
35
52
Bay of plenty
Experience
Commercial
Anything that could become live should be earthed and considering the number of wires in many modern machines that could come loose with vibration and movement and how easy it is to earth things it really should be done. An old sparky mate once told me that the only wire that you had to get right was the green one.
 
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240
166
Mid Canterbury
Experience
Semi Commercial
Just off the top of my head some differences between UK and NZ
We use a different earthing system. In NZ we drive earth stakes wheres in the UK the earth comes in with the mains. To the consumer not much difference. The UK uses 13amp fused plugs. This is mainly due to the use of ring circuits for power outlets. NZ uses radial circuits

You only need to earth a metal sink or shower tray if copper pipes are used. Most modern houses use plastic pipes

RCDs are mandated in domestic installations (not required in commercial or industrial) not sure what the current UK rules are
R U an electrician or electrical engineer?
 
5,515
5,823
canterbury
Experience
Commercial
When you done that perhaps you could come have a look at Stella's Detroit 60 series heart..
She got sick the other day.
The computer told her to go into limp mode, citing a fuel pump issue.
Fixed all that, but she's still limping.

I'm wondering if there's a short in the wiring loom ?
 
8,432
4,863
maungaturoto
Experience
Commercial
When you done that perhaps you could come have a look at Stella's Detroit 60 series heart..
She got sick the other day.
The computer told her to go into limp mode, citing a fuel pump issue.
Fixed all that, but she's still limping.

I'm wondering if there's a short in the wiring loom ?
whats the codes?
have you got the manual that explains the codes?

modern engines are really helpful in diagnosing faults.
 


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