Split Bolts vs Wire Nuts on the Roof [RE-wrenches]

[Matt Tritt]

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  Drake,

  Those floating, insulated connectors are the "Burndy" connectors I 
mentioned in an earlier post, made by FCI I believe. They also make 
Kearnies, but connectors and everything else you might imagine.

  Matt T
  ----- Original Message ----- 
  From: "Drake Chamberlin" <solar at ecoisp.com>
  To: <RE-wrenches at topica.com>
  Sent: Monday, December 06, 2004 4:34 PM
  Subject: Re: Split Bolts vs Wire Nuts on the Roof [RE-wrenches]




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  For two wire connections, I like mechanical butt end connectors.  They are
  much easier to install, insulate and tape than split bolts, as well as
  being cheaper.  They also take up less room in the box.

  Mechanical butt end connectors also make good, permanent connections for
  120/240 volt service drops from the utility line.  They dangle in the 
wind,
  snow and rain.  The neutral conductor is not even covered, and they keep
  working for many years.  This method is accepted in Denver, where the
  inspections are rigorous.

  The code issue for connecting more than two wires together is that a butt
  end connector may not be listed for more than one wire per terminal.  An
  inspector might have a problem it the connector is used to splice three or
  more wires together. The reality is that if stranded wires go into a
  correctly sized set-screw terminal on the connector, they compress very
  tightly together.  They make an excellent, permanent connection.

  The only real-world problem I see with multiple wires under the butt end
  connector's terminal screw would occur when using different sizes of solid
  copper wire.  The screw might not tighten adequately on the smaller wire.

  A number of manufacturers make floating, insulated terminal blocks.  These
  are useful for many applications, including paralleling multiple series
  sets of batteries.  They come in a variety of sizes.

  -Drake

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