If like many of my customers your fuseboard has been upgraded, it will consist of rows of circuit breakers. Each row will be protected by an RCD which will be the larger size switch, normally at the start of the row on the left. An RCD is a Residual Current Device use for protection/earth [as per picture below]
Next door to the fuseboard is an independent box the main switch, the property of your energy supplier – see picture with the words 30/45/60A and in a glass window, ever so small, you will see a number either 30, 45 or 60A and this tells you the amount of supply you have coming into your premises. [as per picture below]
40A RCD serves up to 4 breakers
63A RCD serves up to 8 breakers
40A RCD serves up to 4 breakers
63A RCD serves up to 8 breakers
Over many months I have received calls from customers who have experienced regular tripping of the RCD which would suggest that an upgrade from 40 to 63A is recommended. And on subsequent follow ups, this has often been the case. As always, if in doubt, speak to a qualified electrician.
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