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When it comes to the rules and regulations pertaining to cables, it is very important that you understand what every sign or symbol means. This is as much for your own safety as it is for your electrical appliances; a small mistake could be costly. Each of the terminologies you’ll find used in a cable is meant to help you know what to connect with what, and what not to connect. For instance, IT is usually used to refer to the total amount of current that a single circuit can carry at a room temperature of 30 Degrees C. I2 simply refers to the operating current; this means the maximum current which if exceeded, makes the fuse or circuit breaker blow up. Similarly, IZ is used to refer to the total capacity of current a given cable can carry. IB is for the exact amount of power or current that a cable can carry. Taking note of the above terminologies may come in handy someday.
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