Figure 6-47.--Shore-tine connections.

boxes have a removable plug in the bottom of each

shore-line connection box and the other end will be

box for inserting the cable.

connected to the lightning arrester box on the ship.

Figure 6-47 shows the basic circuit

Each set of shore-line telephone leads from

arrangement for a typical lightning arrester box.

the switchboard pass through a lightning arrester

Each lead of an incoming line has a 5-ampere fuse

box and end in a shore-line connection box. The

and a set of carbon contacts in the line. If lightning

lightning arrester box protects the telephone operator

strikes the line, the fuse will blow to open the circuit

and telephone equipment should lightning strike the

to the switchboard equipment. The carbon contacts

incoming telephone lines.

will fuse together to provide the incoming potential a

path to ground. Most ships have a lightning arrester

The lightning arrester and shore-line

box on each side, port and starboard.

connection boxes may be combined. The installations

vary from ship to ship, and those mentioned here

serve only as examples of the variety you may find in

the fleet. On a large ship you are likely to find one

arrestor box and one connection box on each side,

port and starboard. Some small ships have only one

lightning arrester box in the circuit ahead of the lines

that branch off to the port and starboard shore-line

connection boxes. Normally, standard electrical

connection boxes are used where the incoming shore

lines connect to the ship's lines. A practice that is

gaining favor calls for the use of amphonel-type,

multipin, jack-and-plug combinations. In such a case,

the plug fits the shore-line connection box and the

jack attaches to a portable cable that is run to the

Figure 6-47.--Shore-tine connections.

local shore-line connection box on the pier. The new

Figure 6-46.--Current flow test set controls and indicators.