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Old 11-02-2016, 04:26 PM   #1
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Default Earth bonding for AC units

Hi Guys,
I'm a bit confused about earth bonding for AC units as I found some suppliers do an earth bonding connection between their units chassis and the main earth point in the control panel and some they got nothing bonded to the frame or the chassis with the earth wiring,The question is :
- Is there any kind of requirement or standards to tell that there must be some kind of bonding connection between all the metal part inside the AC unit?

Thanks
Steve
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Old 11-02-2016, 04:56 PM   #2
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Hey Steve, welcome.

I know of a few Australians, but I don't think I've seen any New Zealanders here. Hopefully there will be someone who can help you with your requirements and code.
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Old 11-02-2016, 05:00 PM   #3
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wasnt Chewy from NZ?
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Old 11-02-2016, 05:02 PM   #4
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wasnt Chewy from NZ?
I miss that gay happy bastard. I was thinking he was Aussie, but you may be right.
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Old 11-02-2016, 05:03 PM   #5
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wasnt Chewy from NZ?
Yep

Not sure what standards NZ uses but I am pretty positive world wide bonding between electrical components is mandatory with a few exceptions.
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Old 11-02-2016, 06:10 PM   #6
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First, you should revisit your profile and spell "electrcican" correctly.

As for the standards for bonding of internal parts of electrical device, it's
not the responsibility of the electrician. If it's certified by the appropriate
body that's all that matters. Around here the 2 main main bodies are CSA
and ULc.
While it doesn't matter to us, the fact is that manufactures can bond metal
parts by way of wires, straps, screws, etc.. They can also ensure that parts
will not become live by double insulating them. In this case no bonding is
necessary. At least, that's the way it works up here.
P&L
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Old 11-02-2016, 06:33 PM   #7
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Thanks for your information,
You mentioned that the manufacturer can do bonding by screws.
Do you mean screw all the body parts together and that's it? don't they need at least one main wire from the main supply earth to the nearest point in the chassis?
Cheers
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Old 11-02-2016, 06:55 PM   #8
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I would expect the metal casing of an AC unit to need earthing not bonding.

Some AC units have a plastic casing are you 100% sure the ones without the earth bolt are steel?
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Old 11-02-2016, 07:10 PM   #9
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Quote:
Originally Posted by razouki View Post
Thanks for your information,
You mentioned that the manufacturer can do bonding by screws.
Do you mean screw all the body parts together and that's it? don't they need at least one main wire from the main supply earth to the nearest point in the chassis?
Cheers
Steve
Main thing the testing authorities will be interested in is that the bonding
is low impedance and capable of carrying a min specified current. They'll
also want to ensure the bonding will not come loose, oxidized, or
otherwise become ineffective. How those specs are achieved are the
responsibility of the engineer(s) designing the product.
No reason that a screw, bolt or other fastener, wouldn't meet these
requirements as well as a wire. Fact is the wires are usually attached by
screws anyways.
P&L
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Old 11-02-2016, 07:13 PM   #10
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Quote:
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I would expect the metal casing of an AC unit to need earthing not bonding.

Some AC units have a plastic casing are you 100% sure the ones without the earth bolt are steel?
Not sure if the meaning of earthing and bonding are the same around the
world. But I'd rather not open that can of worms right now as I'm not sure
it matters to this thread.
P&L
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Old 11-03-2016, 03:11 AM   #11
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Quote:
Originally Posted by PlugsAndLights View Post
Not sure if the meaning of earthing and bonding are the same around the

world. But I'd rather not open that can of worms right now as I'm not sure

it matters to this thread.

P&L


You may be correct. Here anything that can become live through fault conditions is earthed (metallic case of AC unit).

Anything that cannot become live through fault conditions but could introduce a difference in potential is bonded (possibly the AC system pipework)

Back to the op - a simple continuity test between the earth terminal for the unit and the casing will tell him if the casing is earthed or not.
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Old 11-03-2016, 07:09 AM   #12
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Quote:
Originally Posted by razouki View Post
Hi Guys,
I'm a bit confused about earth bonding for AC units as I found some suppliers do an earth bonding connection between their units chassis and the main earth point in the control panel and some they got nothing bonded to the frame or the chassis with the earth wiring,The question is :
- Is there any kind of requirement or standards to tell that there must be some kind of bonding connection between all the metal part inside the AC unit?

Thanks
Steve
Wow this guy's down under down under! Welcome to the forum NZ.

I agree as far as bonding everything inside the cabinet, that's on the NRTL that issued the listing. The electric code is going to require the bonded conductor to be run with the circuit. No electric code is going to require you to get inside that cabinet and test everything for continuity and bond it; that's the NRTL's job and the manufacturer's job during manufacturing of the unit.

Why did the question come up? New construction? Changeout? Servicing an existing system? Did someone get hurt?
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Old 11-03-2016, 02:58 PM   #13
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Hi Mike,

Many thanks for your comments , I'm just one step away from down under...)
My question came to mind as I'm contracting now for a small company that manufacturing AC units to inspect their wiring diagrams, looms, and if it complies with safety and standards so while I was doing the inspection, I noticed that there is no earth bonding to any part of the unit outside the electrical box.
Is that legal?

Cheers
Steve
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Old 11-03-2016, 03:13 PM   #14
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Welcome aboard! Hope you enjoy hanging out here. I have an old GF, well 30 so she really isn't an 'old' GF in Auckland. Also two of my sisters in law living there, small world.
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Old 11-03-2016, 07:39 PM   #15
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Quote:
Originally Posted by razouki View Post
Hi Mike,

Many thanks for your comments , I'm just one step away from down under...)
My question came to mind as I'm contracting now for a small company that manufacturing AC units to inspect their wiring diagrams, looms, and if it complies with safety and standards so while I was doing the inspection, I noticed that there is no earth bonding to any part of the unit outside the electrical box.
Is that legal?

Cheers
Steve
Sounds like your'e the 3rd party inspector then. In that case it is your duty to affirm that everything is bonded. Typically there is a bonding lug on the chassis and everything that a human can touch is bonded to that lug. The lug receives the EGC from the branch circuit. I have no idea who you are working for or what regulations exist down under down under but my advice is to require a label (sticker) that says disco power before servicing and for the manuf. to include a continuity test to that lug prior to labeling the equipment so they have a record of their diligence prior to shipping the unit.
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Old 11-04-2016, 05:22 AM   #16
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Steve.,

Welcome to the fourm here .,,

Now let me get to the quick point here.,,

Do you have the latest infomation on the Aussie / NZ electrical code and what it is required in your area ?


As far for bonding of outside of electrical junction or connection point box.

It should be bonded to the point of earth screw or some type of connection of earth conductor there.
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