I wired a beauty shop years ago with stranded THHN and not only did I
use the back wired clamp receptacles, I used Buchanan Splice Cap Crimp
Connectors with the Splice Cap Insulators which snap on to the splice.
2006S Copper Crimp Connector:
2007 Splice Cap Insulators:
4 Way Crimp tool for connectors:
I've used the items for years on critical power and alarm systems. I
used the Buchanan crimp connectors and insulators to wire up a Halon
fire suppression system in a mission control center to protect a very
expensive Cray Super Computer. Tens of thousands of feet of 14 THHN
wire and hundreds of critical connections were necessary. It's the
best connector I've ever used on stranded wire and especially when
mixed with solid wire.
On 2/14/2011 11:05 PM, email@example.com wrote:
They work very well with any wire type especially when mixed. If
I have a connection that I don't want to fail, I use the crimps.
Ideal has another insulator called a Wrap-Cap that I've used on
motor lead wires with a set screw connector or crimp cap. They're
reusable and with a set screw connector, the connection can be
disconnected for equipment swap out without cutting the wires off.
Agreed that is a superior method for making life-critical circuit
connections that are unlikely to ever need to be reconfigured...
I bet that since you use that Buchanan crimping tool all the time
you are probably very fast at making them up, yet if someone
wasn't making connections that way day in and day out it would
take them much longer to make up connections that way as
opposed to using wirenuts...
You can actually squeeze the Nylon cap with lineman's pliers bending
the metal retaining ring and the cap will come off. The crimp cap
can also be squeezed and deformed and it will come off without damaging
the wire ends. You don't have to cut the wire shorter to redo or add
to the splice. The parts aren't reusable but if a Wrap-Cap insulator
is used, all that's wasted is the metal connector.
In this case we are not discussing the failure of the outlet itself,
just the fact that if outlets are wired so that the circuit can be
broken if one of the connections to it comes loose as when they
are pass-through wired on a circuit, it causes a lot of work to
locate the failed connection...
Thermal cycling, overload conditions and vibrations from equipment
can all cause electrical connections to come loose...
Hence the pigtail vs. pass-through wiring debate...
I have forty five years in the craft at this point and I can assure
you that daisy chaining outlets in commercial and industrial work is
routine practice. Unless the owner has specified pigtailing so that
you can bid the job appropriately and install the next size larger
boxes you will end up with a worse job then pigtailed because the
electricians will have to be pushed hard to bring the job in at a
profit. Frequent phrases out of the foreman's mouth will be "hurry up
every chance you get'" and "just put it on the wall it only has to
last 365 days." If quality receptacles are used and the electricians
are permitted to do their jobs carefully daisy chained receptacles
have no higher tendency to fail then any other connection.
Using screw pressure clamping receptacles in their feed through
configuration is not bad advice and coming across all high and mighty
does you no credit. Anyone with real experience in the craft knows
that the perfect is the enemy of the good. Perfect installations are
financially impracticable and good installations will outlast the
buildings in which they are installed.
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