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'''

|0.04 ||1 x 10 A ^-4||approx. 3 – 3.5 mm head diameter2 x 10^-8

|20 A 0.1 |approx. 2 x 10^-3|4 x 10^-5|8 x 10^{-5 mm head diameter}|8 x 10^-9

|For DC currents: 0.2|1 x 10^-4|approx. 0.5 – 0.8 Ax 10<sup>-6</mm²sup>|} *'''Head radius R for electrical loads'''4 x 10^-6 {| class="twocolortable" style="text4 x 10^{-align: left; font-size: 12px;width:40%"8}

|for I < 1 A 0.3|R &#8776; 1,5 mm|.5 x 10^{-|I = 6 A}|R &#8776; 1.5 mm|x 10^-6|I = 1.8 x 10 A ^-7|R &#8776; 3.2 x 10 mm|^{-|I = 20 A |R &#8776; 15 mm10}

Fig. 6<div class="multiple-images"><figure id="fig:Failure probability of a contact as a function of the voitage">[[File:Failure probability of a contact as a function of the voitage.18jpg|left|thumb|Figure 2: Failure probability of a contact as afunction of the voltage (according to Kirchdorfer);Ag/Ni10; 10 mA]]</figure>

[[File<figure id="fig:Failure probability of a contact as a function of the voitage.jpg|left|current">[[File:Failure probability of a contact as a function of the voltage (according to Kirchdorfer); Ag/Ni10; 10 mA]] Figcurrent. 6.19jpg|left|thumb|Figure 3: Failure probability of a contact as afunction of the current (according toKirchdorfer); Ag/Ni10; F _k = 0.45 N; U = 24 V]]</figure></div><div class="clear"></div>