Electrical Guide

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Before you go to touch any low voltage electrical system, first things you must always remind ourselves, “SAFETY FIRST” is our most concerned matter. Why? It simply that you don’t want any unhappy things like the following happens on us. It’s not just money matter but your body and life are irreplaceable and very precious than gold. Furthermore, you are the pillar of our family who need you so much. Everyday, they want see you go back in whole piece.

You may find the main reasons of electrical safety concern are mentioned as below:-

i) LIFE IN DANGER - we must avoid any electric shock which make us uncomfortable whole day. More seriously, it may bring fatality with direct contact on exceeding 30mA current when time prolongs.

Basic Solution: use Residual Current Device (RCD) to cut off the current leakage promptly.

Figure 1: Residual Current Device (RCD)

In the market, you can search many forms of RCDs as displayed as above. The useful data is as follows:

1) In : 40 Amperes (Normal current),

2) I∆n : 0.03A or 30mA (Operating current),

3) Un : 240V~ (System Voltage),

4) 50Hz (System frequency).

5) 2 poles ( two upper terminals & two lower terminals)

Now, we will move to the next safety reason:-

ii) PROPERTY DAMAGES - we must prevent any fire on the building and equipment which cause from overheating.

Basic Solution: use Circuit Breaker (CB) to isolate the overcurrent effectively.

Figure 2: Moulded Case Circuit Breaker

1) In : 60 Amperes (Normal current),

2) Un : 415V~ (System Voltage),

3) 50Hz (System frequency).

4) 3 poles ( three upper terminals & three lower terminals)

iii) LOSS OF PRODUCTION – we must avoid the nuisance trip on the electric machines to ensure continuous operation without disturbance.

Basic Solution: select the proper rating and setting of Circuit Breaker or RCD.

All electrical equipments are manufactured and governed in compliance to the local legislation and electrical ordinance which make sure all manufacturers meet their standard.

The selection of RCD and CB will be discussed in detail later on.

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Tags: low voltage //