The institution of electrical engineers (IEE) has laid out clear and precise guidelines in the selection and use of cables when wiring, or in any other electrical related task. If you are looking for someone to wire your home or office, it is always so important to ensure that the person is fully qualified and certified. Using the wrong kind of cable may cause malfunctions at best, and at worst, fatal accidents. Bonding, earthling, protection, circuit design; al these are greatly determined by the type and design of the cable. Thus in a nutshell, the cable design is one of the major factors you ought to consider before buying, or wiring.
In cable design and factors, there are some few terminologies that you ought to acquaint yourself with. You don’t have to be an electrician to understand what they mean, as this knowledge may come in handy someday;
- Iz; this refers to the capacity of current that can be carried by the cable.
- It; this refers to the total current that’s tabulated for every single circuit at a temperature of 30 Degrees C.
- Ib; this is the design current, that is the actual amount of current that the cable can carry.
- I2; this is usually the operating current, ie current at which the circuit breaker opens or fuse blows up.
In order to avoid overloading your cables (which may lead to short-circuits or fires in some instances, you must always ensure that the operating current (I2) is as required.