Browsing articles tagged with "200A Service - Licensed Electrician Robert Monk"

200A Service Upgrade and new receptacles

Jun 13, 2011   //   by Robert Monk   //   Job Roll, Portfolio Blog, Residential Renovation  //  No Comments

This project on S Melville St. features:

200A Service Upgrade and new receptacles

  • 200A service upgrade and new receptacles from existing 100A, with 30+ breaker positions and GFCI receptacle at panel location in garage.
  • Add 4 receptacle outlets, including a GFCI for the 2nd floor bathroom.
  • Convert (3) 220V receptacles to (3) 120V receptacles on dedicated AFCI breakers.

 

Panel bonding jumper missing / 200A Service

Apr 27, 2011   //   by Robert Monk   //   Field Reports Blog, Trouble & Repairs blog  //  No Comments

A green-colored screw should thread into the heavy gauge steel of this 200A service panel enclosure, securing the bonding jumper. At the center of the highlighted area in the photo, one can see that the screw was either removed or never installed.

20110427-025141.jpg

 

This threaded ground bonding location ensures that the metal panel enclosure remains at zero voltage to the building and service grounding systems, and helps ensure that a low-impedance path for fault current on the panel enclosure will trip a breaker before serious damage occurs. A poor connection here could result in a high-impedance path for fault current. An ungrounded (‘hot’) conductor could contact the panel enclosure and discharge to ground through this poor connection at relatively low levels of current not sufficient to trip the breaker protecting the circuit. At least two hazards would result:

  1. The connection missing the screw could heat up and melt adjacent wire insulation, causing more trouble, or ignite the wooden surface on which the panel is mounted.
  2. The panel enclosure would remain energized until the fault is cleared, and could electrocute someone.

 

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