Changes

===<!--6.4.6 -->General Rules for Dimensioning of Contacts===

*'''Recommended Minimum Contact Forces at Slightly Sliding Contact Make:'''

{| <table class="twocolortable" style="text-align: left; font-size: 12px;width:40%">|-<tr>|<td>Gold </td> |<td>0.03 N</td>|-</tr><tr>|<td>Silver </td>|<td>0.1 N</td>|-</tr><tr>|<td>Tungsten </td>|<td>0.5 N</td>|-</tr>|}</table>

*'''Contact Force Recommendations:'''

*'''General Rules for Dimensioning of Contact Rivets'''

[[File:General Rules for Dimensioning of Contact Rivets.jpg|left|thumb|Figure 1: General Rules for Dimensioning of Contact Rivets]]

   '''Failure Probability of Single and Double (Bifurcated) Contacts''' (according to Thielecke) {| class="twocolortable" style="text-align: left; font-size: 12px;width:40100%"

|For AC currents: !Contact force[N] !colspan="4" style="text-align:center"|approx. 1 – 1.5 A/mm²'''Single contact'''

|10 A |approx0. 3 – 3.5 mm head diameter04 |-|20 A |approx. 5 mm head diameter|1 x 10<sup>-|For DC currents: |approx. 0.5 – 0.8 A4</mm²sup>|} *'''Head radius R for electrical loads''' {| class="twocolortable" style="text2 x 10<sup>-align: left; font-size: 12px;width:40%"|-|for I 8< 1 A |R &#8776; 1,5 mm/sup>

|I = 6 A 0.1 |R &#8776; 2 x 10^-3|4 x 10^{-5 mm}|8 x 10^-5|8 x 10^-9

|I = 0.2|1 x 10^-4|8 x 10^-6|4 x 10 A ^-6|R &#8776; 4 x 10 mm^-8

|I = 20 A 0.3|R &#8776; 15 mm5.5 x 10^-6|1.5 x 10^-6|1.8 x 10^-7|3.2 x 10^-10

[[File:Failure probability of a contact as a function of the voitage.jpg|left|thumb|Figure 2: Failure probability of a contact as a function of the voltage (according to Kirchdorfer); Ag/Ni10; 10 mA]]

[[File:Failure probability of a contact as a function of the current.jpg|left|thumb|Figure 3: Failure probability of a contact as a function of the current (according to Kirchdorfer); Ag/Ni10; F_k = 0.45 N; U = 24 V]]