Howard HI-104 Single-Phase Pad Transformer - Manual (Page 11)

Document 2.4.96, Revision 0
March, 2013
11
Single-Phase Pad-Mounted Compartmental-Type Distribution Transformers
with the universal bushing wells. Do not use
incompatible or improperly rated bushing inserts,
or equipment damage could occur. When installing
inserts, follow the manufacturer’s instructions
accompanying the inserts. Insulated dead-end caps
or plugs must be installed on all unused high-voltage
bushings before energizing. Shipping dust caps must
never be used in place of insulated dead-end caps or
plugs.
Live-front transformers are equipped with high-
voltage bushings having tin-plated eye-bolt or spade
terminals that are suitable for connection with either
aluminum or copper conductors to the high-voltage
source.
Low-Voltage Terminals
Single-phase pad-mounted transformers are usually
provided with externally-clamped, molded, low-
voltage bushings, with or without NEMA standard
spade terminals. When threaded terminals are
installed, a backup nut should be installed and
tightened against the terminal to ensure an
adequate connection that will not loosen or overheat.
Secondary line leads should be securely attached to
the terminals to ensure a low-resistance connection.
Space-Saver ™ style transformers may be provided
with a block-mounted, wire-lead, low-voltage
termination instead of molded bushings. These wire
leads are designed to be crimp-connected to the
load leads.