The £1300 AFDD consumer unit

I wonder if in some ways PME makes things worse - similar spikes are imposed on L & CNE nearer the lightning, but then all the additional electrodes pull the CNE, but not the L, a bit closer to true earth before it gets to the consumer. Not that old fashioned TN-S with lead covered cables and rotted hessian would be any better.


I agree about the phone lines - that's where I had most problems at my old Dad's place - usually with equipment that was connected to both the mains and the phone line. (out in the sticks, miles of overhead phone lines, LV underground but only for about 40m to a pole transformer then overhead HV for miles). My worry is that adding SPDs to the electrical installation (but not the phone lines) could actually make things worse as the LV side gets pulled down to something closer to true Earth while the phone line still bounces about as it always did - do the equipment between the two might actually be stretched more than before.


   - Andy.

I wonder if in some ways PME makes things worse - similar spikes are imposed on L & CNE nearer the lightning, but then all the additional electrodes pull the CNE, but not the L, a bit closer to true earth before it gets to the consumer. Not that old fashioned TN-S with lead covered cables and rotted hessian would be any better.


I agree about the phone lines - that's where I had most problems at my old Dad's place - usually with equipment that was connected to both the mains and the phone line. (out in the sticks, miles of overhead phone lines, LV underground but only for about 40m to a pole transformer then overhead HV for miles). My worry is that adding SPDs to the electrical installation (but not the phone lines) could actually make things worse as the LV side gets pulled down to something closer to true Earth while the phone line still bounces about as it always did - do the equipment between the two might actually be stretched more than before.


   - Andy.