Cold transport brings a compressor unit to mind. The ATP text divides equipment into five kinds, and one of them carries no mechanical unit at all: it draws its cold from a stored source. The letter is R and the name is refrigerated equipment.
The cold sources the text lists
In the definition reproduced by the Ministry guide, refrigerated equipment is insulated equipment that uses a source of cold instead of a mechanical or absorption unit. The sources listed are natural ice with or without salt, eutectic plates, dry ice with or without sublimation control, and liquefied gas with or without evaporation control.
The list itself carries information. A eutectic plate is not an exception pinned to the margin of the agreement; it sits in the main body of the text, named immediately after natural ice.
Class temperatures are defined at an outside air temperature of +30 °C
| Class | Highest temperature held inside the empty body |
|---|---|
| A | +7 °C |
| B | -10 °C |
| C | -20 °C |
| D | 0 °C |
Both halves of the condition matter. Outside air averages +30 °C and the body is empty. This is a laboratory condition; it does not include how often the door opens on the round, what temperature the load arrives at, or how packaging blocks the air. A class letter is a statement of capacity, not a guarantee for a trip.
Marking codes
| Code | Meaning |
|---|---|
| RNA | Normally insulated refrigerated equipment, class A |
| RRA | Heavily insulated, class A |
| RRB | Heavily insulated, class B |
| RRC | Heavily insulated, class C |
| RND | Normally insulated, class D |
| RRD | Heavily insulated, class D |
The first letter gives the cooling type, the second the insulation, the third the temperature class. An inspector reading the plate learns from three letters what cools the equipment, how well it is insulated and which regime it works in.
Reading the class table together with ice cream carriage temperature settles which regime is held by which equipment.
Why it turns up most often on ice cream
The guide notes that this kind of equipment is found most often on ice cream vehicles. The reason is in the regime: the Turkish Food Codex communiqué on ice cream requires the temperature during carriage, storage and offer to the final consumer to be at most -18 °C, with a short-term tolerance of no more than 3 °C. A cold source that melts at a fixed temperature suits a load that has to stay inside a narrow band.
The Ministry's own assessment
A eutectic system uses no diesel. The plates are charged from the grid at night, when electricity is cheapest. No fuel or energy is needed for cooling during delivery. Because eutectic refrigerated equipment works independently of the vehicle, a constant temperature is always provided. Perishable food stays protected even if the vehicle breaks down.
Those sentences belong to the roadside inspection guide, not to us. An official text introducing an equipment class rarely stops to list that class's operating advantages. This one does.
Do not confuse a container with a body
Class R describes a body: the vehicle superstructure or the container. An insulated container placed inside a standard van carries no ATP class of its own. The physics is the same, the legal object is not. Keeping that distinction clean avoids misunderstanding both in an offer and at a roadside check.
