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TDG: Classification, UN numbers and Schedule 1

Who must classify dangerous goods, when a substance counts as dangerous goods, how UN numbers and shipping names work, and how to read the columns of Schedule 1, including the limited quantity and ERAP indexes.

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Classification, UN numbers and Schedule 1 · Question 1Score 0/0

A drum of used flammable solvent is sent for disposal. What must be added before its shipping name?

Study reference: TDG Act and Regulations (current to 2026-09-30), Ch. 3 Classification — Part 2, ss. 2.1–2.2; Schedule 1 column headings

All 13 questions in this test

Every question and its answer choices. The correct answers and explanations appear when you take the test above.

  1. A drum of used flammable solvent is sent for disposal. What must be added before its shipping name?

    1. The word RESIDUE
    2. The word WASTE
    3. The words LIMITED QUANTITY
    4. The word HOT

  2. Who must classify dangerous goods before they are transported from a Canadian site?

    1. The consignor
    2. The consignee
    3. The carrier
    4. The driver

  3. In Schedule 1, which text is the shipping name?

    1. The upper-case text in column 2
    2. Any text in column 5
    3. The lower-case text in column 2
    4. The text in column 7

  4. What does the word "Forbidden" in column 3 of Schedule 1 mean?

    1. The goods must not be imported, offered, handled or transported
    2. The goods may be shipped only with a Transport Canada escort
    3. The goods may travel only by road vehicle and never by aircraft or vessel
    4. The goods may be shipped only as a limited quantity

  5. A liquid is transported at 110 °C and its shipping name does not mention the temperature. What must be added to the shipping name?

    1. The words ELEVATED RISK
    2. The word WASTE
    3. The letters PG I
    4. The word HOT

  6. How is a UN number written?

    1. A colour code and the packing group
    2. Two digits for the class and a letter
    3. The letters UN followed by four digits
    4. Three letters followed by two digits

  7. What does column 6(a) of Schedule 1 give for most dangerous goods?

    1. The UN number
    2. The ERAP index
    3. The limited quantity index
    4. The packing group

  8. What does the code E0 in column 6(b) of Schedule 1 mean?

    1. The goods are not permitted as an excepted quantity
    2. The goods are exempt from every part of the Regulations
    3. The goods may be shipped in any quantity by air
    4. The goods need no label when shipped in small boxes

  9. Which column of Schedule 1 is the ERAP index?

    1. Column 6(a)
    2. Column 7
    3. Column 9
    4. Column 4

  10. On a Schedule 1 entry, where are subsidiary classes shown?

    1. In upper case after the shipping name
    2. In parentheses under the primary class
    3. In column 7 after the ERAP index
    4. As a letter after the UN number

  11. What does N.O.S. mean in a shipping name?

    1. Not on schedule
    2. Non-odorized substance
    3. No official standard
    4. Not otherwise specified

  12. A product is not listed by name in Schedule 1 but meets the criteria for Class 8. Is it dangerous goods?

    1. No, unless the carrier asks for it to be regulated
    2. Only if it is shipped in a large means of containment
    3. No, only products named in Schedule 1 are regulated
    4. Yes, because it meets the criteria of a class

  13. How is a Class 1 explosive classified for TDG purposes?

    1. Using the carrier's own risk assessment
    2. Using the classification chosen by CANUTEC
    3. Using the classification under the Explosives Act
    4. Using the WHMIS safety data sheet alone

Classification, UN numbers and Schedule 1: key rules to remember

Our summary of what the official handbook says on this topic, in our own words. Read it before or after the practice questions above, then check the original chapter. Read the official chapter ↗

Determining when substances are dangerous goods (s. 2.1)

  • A substance is dangerous goods if it is listed by name in Schedule 1 and meets the criteria of at least one class, or if it is not listed by name but still meets the criteria of at least one of the nine classes.

Responsibility for classification (s. 2.2)

  • The consignor must classify the dangerous goods before letting a carrier take possession of them.
  • An importer-consignor must make sure the classification is correct before the goods are transported in Canada.
  • Explosives are classified under the Explosives Act; radioactive materials under the Packaging and Transport of Nuclear Substances Regulations, 2015.

Classification

  • The classification of dangerous goods includes the shipping name, primary class, compatibility group, subsidiary class, UN number and packing group or category, as applicable.

How the columns are used

  • Column 1 gives the UN number: four digits preceded by the letters UN (for example UN1203).
  • Column 2 gives the shipping name; the shipping name is the upper-case text in this column. N.O.S. means "not otherwise specified".
  • Column 3 gives the primary class, with any subsidiary classes in parentheses; "Forbidden" means the goods must not be transported.
  • Column 4 gives the packing group or category; column 5 lists the special provisions that apply (set out in Schedule 2).
  • Column 6(a) is the explosive limit and limited quantity index; column 6(b) is the excepted quantity code (E0 to E5).
  • Column 7 is the ERAP index: the quantity above which an approved ERAP is needed.
  • Column 8 is the passenger carrying vessel index; column 9 is the passenger carrying road or rail vehicle index.
  • Schedule 3 lists dangerous goods in alphabetical order of shipping name, including forbidden goods that have no UN number.

Shipping names on documents (s. 3.5)

  • When goods are waste, the word WASTE is added before the shipping name.
  • The word HOT is added for liquids carried at 100 °C or more, or solids at 240 °C or more, unless the shipping name already says MOLTEN or ELEVATED TEMPERATURE.

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