Re: [Amel Yacht Owners] Degraded continuity


Patrick McAneny
 

Alexandre, Its pretty simple, take a wire and clip it onto the quadrant where the ground wires connect , or to the copper ground strap in the bilge , then connect the wire to one side of a multi meter , say the black lead and then place the red lead on the zincs on your rudder . You of course have to set your meter to the continuity setting , its simple , have someone that knows how to use a meter show you or follow instructions provided with your meter.If you have continuity your meter will beep and the numbers change. While its vital that you have continuity , as I have just learned , that does not mean that you have adequate continuity. While you are in the water you can have the potential checked which gives you a better picture of the state of protection. Don't ask me to explain potential , I only have a foggy idea of what it means and could not put it into words.
Hope this helps,
Pat SM123


-----Original Message-----
From: Alexandre Uster von Baar uster@... [amelyachtowners]
To: amelyachtowners
Sent: Tue, Aug 30, 2016 10:43 am
Subject: Re: [Amel Yacht Owners] Degraded continuity

 
Good morning Pat,

Thanks for sharing the information.

Please forgive my ignorance, but how do you measure the continuity…
I hate to admit it, I didn’t know about it when I did the last haul out in March 2015, I then read on the forum and the owner manual.
And will definitely want to do it next year.
But how do you do it? (pictures rather than words would be so nice)…

I assume you can only do it on land.

Sincerely, Alexandre
SM2K #289 NIKIMAT
Club Nautico de San Juan, Puerto Rico

--------------------------------------------
On Tue, 8/30/16, sailw32@... [amelyachtowners] <amelyachtowners@...> wrote:

Subject: [Amel Yacht Owners] Degraded continuity
To: amelyachtowners@...
Date: Tuesday, August 30, 2016, 7:51 AM


 









Before my boat went into back into the
water yesterday , I checked for continuity between the
copper strap and the zincs and I did have continuity. Later
, I had two marine electricians on the boat and they checked
the potential from the quadrant and found it to be only 560
, they tell me that they would expect to see about 900. 900
would insure that the zincs are protecting the metal parts
of the boat. We can only speculate that the connection
between the quadrant wire and the zincs have been degraded .
There may not be enough contact between the zinc bolt and
the strap inside  the rudder , it would only be the
threaded area of the bolt and the strap , and stainless is
not the best metal as a conductor . Bottom line is that I
need more zinc protection/contact. They suggested that we
install a large zinc on the hull with two bronze bolts (
better conductivity )through the hull , wired directly to
the strap in the bilge. I am writing this to inform the
group , that just because you have continuity , does not
mean that you have adequate contact/protection.
Pat SM123












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