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Thread: newbie earth bonding
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26-04-2008, 12:32 AM #1
newbie earth bonding
Hi all
this is my first post so quite new here and to the refrigeration trade. I an working as aengineers mate on refrigeration installs. I have just passed my 17th edition but have yet to gain a lot of experian within the trade. ok my question?
I recently assisted installing a large walk in freezer to which i did the wiring with some guidance from the engineers. Now on the evapourater drain is a heater coil which wraps around the copper pipe which is connecteds to the evap drain by a plastic fitting then the pipe runs outside to the drain. In my opinion this drain shoud be bonded as the only earth conetion under fault conditions would be human contact.
cheers
DaveLast edited by dave_k; 26-04-2008 at 12:36 AM.
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26-04-2008, 12:37 AM #2
Re: newbie earth bonding
Hi Dave
Yes just earth the drain pipe to the main earth in the electrical panel and all should be ok.This is normal practice.
Oh and welcome to REIf it ain't broke, it doesn't have enough features yet.
Damo
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26-04-2008, 10:25 AM #3
Re: newbie earth bonding
it is so nice Good luck
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29-04-2008, 05:12 PM #4
Re: newbie earth bonding
Dave.
I have just read your post.
What form of heater are you useing??
Because the normal form of heater tape. Is Self Regulating Double Insulated.
It's a while since I last read up on this But surely you don't need Earth Bonding on a Double Insulated heater tape?
Or has the regs changed again???
Cheers Grizzly.
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05-05-2008, 08:14 PM #5
Re: newbie earth bonding
Shouldnt the actual metal frame around the evap be bonded allready ?
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05-05-2008, 08:16 PM #6
Re: newbie earth bonding
sorry!! assuming the thred is metal and not plastic!! that the drain connects to !
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05-05-2008, 09:00 PM #7
Re: newbie earth bonding
Copper drains need to be earth bonded. They are insulated from the evap by the plastic conection. If the heater tape was ever to get damaged and short out to the drain it would be lethal to anyone who touched it. The drain pipe needs to be earthed.
taz.
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05-05-2008, 09:12 PM #8
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05-05-2008, 10:05 PM #9
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05-05-2008, 10:29 PM #10
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06-05-2008, 12:37 AM #11
Re: newbie earth bonding
I'd finished and was ten mins from store when phone rang and I was informed that the coldroom was smelling of burning.
I turned round and got back to see the heater tape all chared, burnt and melted. Fourtunately the fuse blew when it shorted out and because it was a freezer it was too cold to cause a spread of thre fire.
A bit embarassing but I managed to sort it out without too much micky taking from the other lads
Cheers taz.
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