MIMS (Mineral Insulated Metal Sheathed), Pyrotenax, PYRO, BICC (British Industrial Calander Cables)
MI Cables, design, limitation and use - 8 questions from a bank of questions
Answer ALL questions. Look for any feedback given if you get an answer incorrect. Keep choosing an answer until you get it correct. CORRECT or INCORRECT answers are indicated at the TOP of the page. A score is given at the TOP of the page when the exercise has been completed. © K.Brown 2015
How should MI be routed when supplying a motor ?
- run straight into the motor terminal enclosure
- install inside trunking up to the motor terminal enclosure
- form MI into a loop before it enters the motor terminal enclosure
- MI should not be used for motor circuits
What is the correct designation for a three-core, light-duty MI cable?
- 2L 2.5
- 1.5 3L
- 3L 1.5
- 1.5 2L
What is the maximum temperature that the copper conductors inside MI can withstand?
- 5000 degrees C
- 2000 degrees C
- 1000 degrees C
- 500 degrees C
What is the name of the special tool required for permanently fixing a sealing disc to the 'pot' on a MI cable termination?
- compression tool
- fitting tool
- crimping tool
- disc tool
Which one of the following statements is not true of a MI cable?
- it does not age well
- it can withstand high operating temperatures
- it can withstand the cold
- it requires special tools
Which one of the following statements is true of MI cable?
- it does not require a cpc
- it does not require special tools
- it does not have any corrosion resistance
- it must have an outer pvc sheathing
What is the primary function of the small brass olive in an MI gland assembly?
- it adds strength to the termination
- it makes the termination waterproof
- it provides corrosion protection
- it ensures a good earth connection
How are the cores of a MI cable 'usually' identified once the installation is complete?
- the use of coloured sleeving
- use of number markers
- write on the cable
- identification is not required
What is the insulating material inside a MI cable called?
- manganese oxide
- magnesium oxide
- magnesium dioxide
- manganese dioxide
What is the name of the special tool used for fitting the pot to the end of a MI cable?
- pot wrench
- potting wrench
- potting tool
- pot tool
What tool is used for removing the outer copper cladding (sheathing) from MI cable?
- stripping tool
- stanley knife
- junior hacksaw
- side-cutters
What is the main disadvantage when using MI cable?
- its expensive
- its difficult to work with
- it requires special tools to work with
- it is hygroscopic