Forums
New posts
Search forums
What's new
New posts
New media
New media comments
Latest activity
Media
New media
New comments
Search media
Members
Current visitors
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Main Forums
Do-It-Yourself (DIY) Question & Answer Forum
High Zs
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support Talk Electrician Forum:
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="SPECIAL LOCATION" data-source="post: 42843" data-attributes="member: 250"><p>sounds like a loose connection somewhere there m8?</p><p></p><p>is there a cord pull isolator switch?</p><p></p><p>IF your R1+R2 0.46 is on 10mm with 9800watt rated shower @ 240v</p><p></p><p>then this would be outside max permissible Volt drop as well!</p><p></p><p>0.46 of 10mm is 71m</p><p></p><p>(from pg 166 OSG 10.0mm = 6.44mohm/m (0.46/6.44)x1000=71.4m)</p><p></p><p>which if you only put in 15m? this is way out!!!</p><p></p><p>Volt drop on 10mm is 4.4mohm/A/m</p><p></p><p>max permissible is 11.5v (5% NON lighting circuit)</p><p></p><p>9800w/240v = 40.8amps</p><p></p><p>so 11.5 = (4.4 x 40 x length)/1000</p><p></p><p>and 11.5 = 0.176 x Length</p><p></p><p>Length = 11.5/0.176 = 65.3m</p><p></p><p>65.3m of 10mm would have an R1+R2 of 0.42.</p><p></p><p>So your existing R1+R2 is too high for volt drop.</p><p></p><p>Also as Noz says..</p><p></p><p>if only 15m of 10mm you should be getting an R1+R2 of 0.0966</p><p></p><p>personally allowing for the odd poor connection with your meter leads..</p><p></p><p>and maybe a screw terminal or switch contact...</p><p></p><p>I'd be happy with something looking around 0.10ohm - 0.15ohm</p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 42843, member: 250"] sounds like a loose connection somewhere there m8? is there a cord pull isolator switch? IF your R1+R2 0.46 is on 10mm with 9800watt rated shower @ 240v then this would be outside max permissible Volt drop as well! 0.46 of 10mm is 71m (from pg 166 OSG 10.0mm = 6.44mohm/m (0.46/6.44)x1000=71.4m) which if you only put in 15m? this is way out!!! Volt drop on 10mm is 4.4mohm/A/m max permissible is 11.5v (5% NON lighting circuit) 9800w/240v = 40.8amps so 11.5 = (4.4 x 40 x length)/1000 and 11.5 = 0.176 x Length Length = 11.5/0.176 = 65.3m 65.3m of 10mm would have an R1+R2 of 0.42. So your existing R1+R2 is too high for volt drop. Also as Noz says.. if only 15m of 10mm you should be getting an R1+R2 of 0.0966 personally allowing for the odd poor connection with your meter leads.. and maybe a screw terminal or switch contact... I'd be happy with something looking around 0.10ohm - 0.15ohm [/QUOTE]
Insert quotes…
Verification
Post reply
Main Forums
Do-It-Yourself (DIY) Question & Answer Forum
High Zs
Top