Lightning damage

[djl]

I know personally (not FOF) of one death due to a hanging RF cable, in
this case a cb antenna. Don't just leave the lead to your antenna
hanging. I use very inexpensive switches from epay that have a grounded
off.

MOV devices only absorb a finite, unpredictable, number of hits. In
other words, the next hit may be the device's failure.  There are other
devices that are better. As with ground fault outlets, you only need one
good protective device per AC circuit. In fact, on the ordinary
household service, one industrial strength device on each side of the
220 service at the breaker box is needed.  Look up "whole house surge
suppressor" online.  Some of the "best" have mov's.   I have not looked
lately at availability of non-mov units, which I could recommend.  
Multiple outlet strips with surge protection have in general mov's that
are too samll. I personally don't trust them.

ARRL has a very good guide to grounding and protection.

73 and happy grounding

--
Dr. Don Latham
PO Box 404, Frenchtown, MT, 59834
VOX: 406-626-4304

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[Drew AF2Z]

I have several series mode surge protectors. They are big, heavy and
more expensive but have none of the limitations of MOV sacrificial shunt
devices.

I would get rid of any older MOV-based surge protection devices that are
lying around. They have been known to burn. The newer ones are supposed
to have thermal protection but I wouldn't trust offshore manufacturers
to implement it correctly; or not skip it entirely like they do filter
components in switching power supplies... All those plastic power strips
that are laying around-- if any have MOV devices I'd trash them. A
sacrificial shunt device in a "stylish" plastic container? No thanks.

73,
Drew
AF2Z



On 11/06/17 22:18, djl wrote:

> I know personally (not FOF) of one death due to a hanging RF cable, in
> this case a cb antenna. Don't just leave the lead to your antenna
> hanging. I use very inexpensive switches from epay that have a grounded
> off.
>
> MOV devices only absorb a finite, unpredictable, number of hits. In
> other words, the next hit may be the device's failure.  There are other
> devices that are better. As with ground fault outlets, you only need one
> good protective device per AC circuit. In fact, on the ordinary
> household service, one industrial strength device on each side of the
> 220 service at the breaker box is needed.  Look up "whole house surge
> suppressor" online.  Some of the "best" have mov's.   I have not looked
> lately at availability of non-mov units, which I could recommend.
> Multiple outlet strips with surge protection have in general mov's that
> are too samll. I personally don't trust them.
>
> ARRL has a very good guide to grounding and protection.
>
> 73 and happy grounding
>

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