voltage drop per connection

[lssmith]

I am sure this is a very simple question for everyone besides me and I have searched for an answer.
What is the amount of voltage drop per connection in a 208 volt 18 amp circuit. The connection is a pin and sleeve plug and receptacle.

Thanks, Scott

 

[7anoter4]

According to HIGH VOLTAGE CIRCUIT BREAKERS Design and Applications by Ruben D. Garzon ch.6.1.4 Temperature at the Point of Contact
Contact temperature depends on voltage drop across the contact:
T=Vc^2/8/l/r where:
r=resistivity of contact materials;
l=thermal conductivity of contact materials;
Vc =voltage across the contact.
On Table 6.1 there are indicated Vc for softening and melting state temperature of some
contact materials.
The minimum voltage for softening state it is for Al 10 mV and maximum for W [tungsten] 400 mV. Cu contact material could withstand 140 mV [softening temperature of 190 oC].
Softening current : Is=2*Vs/r*sqrt(F/pi()/H) where:
F=force exercised on contact [kgf] H=hardness [kg/cm^2].

 

[lssmith]

Thank you for the quick response.

Scott