Routine operation
1 - Radio unit in operation
2 - Reporting off the air
3 - What is your location?
4 - Message recieved
5 - Reception poor - change location
6 - Repeat your last transmission
7 - Request car to car radio operation
8 - Telephone your office
9 - Telephone details
10 - Return to your reporting location
11 - Radio test
12 - Radio failure
Emergency or Urgent
91 - Extreme emergency - keep channel clear
93 - Explosion - if personal injury add signal 94
94 - Accident (Personal injury)
95 - Person suffering from electric shock
96 - Inhalator required
97 - Fire
98 - Water main break
Underground Electric Trouble
21 - Manhole fire
22 - Underground cable trouble
23 - Underground equipment trouble
24 - Underground service trouble
25 - Water leak through service pipe seal
26 - Water in manhole
27 - Outage to high-tension customer
Overhead Electric Trouble
31 - Wires burning
32 - Wire down or broken
33 - Overhead equipment trouble
34 - Overhead service trouble
35 - Pole down or broken
36 - Limb of tree on the wire
37 - Pole on fire
Gas Trouble - Outside
41 - Gas leak - outside
42 - Gas in manhole (specify company)
43 - Gas in street opening
44 - Gas leak at foundation wall
45 - Gas fire
49 - Major gas leak
Gas Trouble - Inside
51 - Gas leak - inside
52 - Poor pressure
53 - No gas
54 - Vent blowing
55 - Service stoppage
56 - Major gas leak - public building
Steam trouble
71 - Vapor entering
72 - Steam leak
73 - Manhole flooded
74 - Send more equipment
75 - No steam
76 - Pressure complaint
78 - Steam main break
General
80 - Time out for meal
81 - No light
82 - Voltage complaint
83 - Street light trouble
84 - No payment
85 - O.P.C. Required or responding
86 - Additional help responding
Letters Following Code Signals
W - No Access
X - Repaired Temporarily.
Y - Repaired permanently.
Z - OK on Arrival