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3.3.4 AC Switch Terminals –Prewire set-up
The AC switch terminals utilize cage-clamp design terminals and in order to
insure proper connection of wiring, prior to inserting stripped conductors into
switch terminals complete the following procedure to make terminals ready for
connections. For each of the AC switch terminals (L1, L2, L3 and N):
1. Use a flatblade screwdriver loosen the cage-clamps by turning the clamp
screw CCW until the screw reaches limit of rotation)
If an electric screwdriver is utilized insure the torque setting is low enough to
NOT OVER-TORQUE the screw. Once screw bottoms out, do not turn it any further.
2. Verify visually the cage clamp is in the fully open position
For AL AC wires:
To make sure good conductivity, bi-metal adapter must be used in conjunction
with aluminum wires.
Extreme temperature rise at the clamping point
If the contact resistance between the aluminum conductor and clamping point is too
high, the clamping point can become very hot and even catch fire in extreme cases.
To ensure a safe and reliable contact, always perform the following work steps:
Use a conductor cross-section at least one number larger due to the lower
current-carrying capacity.
Keep the installation location as free as possible from moisture or corrosive
atmospheres.
Connect the aluminum cables quickly.
Mechanically clean the stripped end of the aluminum conductor (using for instance
a knife blade to scrape off the oxide layer). Then immediately dip the aluminum
conductor into acid-fee and alkaline-free (=neutral) Vaseline and straight away
insert it into the terminal block.
Tighten the clamping screw in the clamping body with the maximum permissible
tightening torque.
Please seal the conduit from inside the wiring box
by using duct seal to prevent living creature or
moisture enter the wiring box.
NOTICE
ATTENTION
35
Installation
Duct Seal
EMT
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