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Our guide to simple checks that can be carried out by the homeowner / occupier

If you have concerns about supply a full survey is not usually justified for domestic customers.  However, as we are contacted regularly about concerns on supply usage (e.g. high bills) there are some simple checks that can be carried out by the homeowner / occupier: 

1. First of all - switch off all of your load (demand) at the main switch.  This is usually a main isolator (main switch) in the consumer unit, or may be an external isolator between the meter and the consumer unit. You should be able to so this safely and without needing tools; if the equipment is not in good order or there are any safety concerns, do not proceed. Loose/bare wires or 'non standard' connection methods should be cause for concern. 
   
   If in doubt, DO NOT TOUCH (even with insulated tools), as you could cause a flash-over (energetic spark/arc and release of energy, like a small explosion).  Take photos and send them to an electrician, or your supplier / network operator for their opinion.  In general terms, suppliers / network operators will be concerned with issues before or at the meter, whereas if something is amiss beyond the meter they will steer you towards an electrician, although of course any responsible supplier/network operator will offer assistance in urgent or dangerous situations as they will be able to isolate supply if absolutely necessary.
    
2. Once everything is off (assuming you have turned it off in step 1, and haven't had to request attendance from a supplier / network operator) - the meter should stay energised, but the reading should not change.  If the reading increases (or the disc continues to spin, or light continues to flash registering power flow), there could be a problem with power flow to another circuit (perhaps to a neighbour or to another part of the building such as a shared loft space).
    
3. If there is still some power flow, check that you have not missed an isolator.  Sometimes there will be more than one isolator, particularly if the installation has been added to.  If all isolators are off, and the meter is still registering power flow, this means that either the meter is wrong, or supply has been 'teed' from somewhere between the meter output terminals and the isolator switch.  This would usually be obvious but may be hidden under panels or covers.  Do not dismantle anything.  If there is any possibility of third party tampering, be aware this may be dangerous and could be a hazard if disturbed.
   
   'Unauthorised abstraction' is the term for energy theft; typically on electricity networks this may  consist of a tee from before the meter, or a meter bypass.  These issues will not normally give rise to an increase in your bills.  However, occasionally we do see 'abstraction' on a smaller scale, such as connection into the back of a socket or other fitting.
   
   If you suspect the meter is faulty, or mis-registering, contact your supplier. They will be able to install a second 'check' meter to confirm the reading of the first.
    
4. If all is well, and the meter has stopped, next switch everything off in the property (or switch off all miniature circuit breakers (MCBs)).  Turn on the main isolator(s). The meter should still be registering no power flow.  If power is flowing,  and you are sure everything in the premises is 'off', perhaps something is connected before the MCBs.   This would need an electrician to confirm there are no hidden circuits connected to your system.
    
5. Gradually switch circuits back 'ON' and note the change in meter reading. You may need to watch the meter for several minutes to see how quickly it is registering.  The use of a 'clamp meter' can be useful but we do not recommend this if you don't have the skills / experience to safely use one.
    
6. If you notice a circuit or appliance that uses more than the expected amount of electricity - investigate further!

Consult a qualified electrician for more advice.  If you suspect illegal activity, contact your supplier or the local Distribution Network Operator.  If in doubt call ENA's helpline on 105.