lightning arrestors

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spectra05

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Piedmont, NC
i m trying to put a lightning arrestor on a main panel and i want to attach it to the main CB to protect the entire house if lightning hit from the supply side of the panel. An inspector friend of mine says i cant and is quoting 280.22, saying that because the service to a single family dwelling is less than 1000v. to me that seems like it is saying what size conductors when on the load side and there is no usses permitted or not permitted like there is for TVSS's.But i want to say it ok because of 230.82 (4) which says only the following equipment shall be permitted to be connected to the supply side of the service disconecting means. then part 4 states instrument transformers, impeadeance shunts, load management devices, and arrestors. this is from NEC 2005 edition. any help would be great.
 
I am not following your inspector friend's comment?

1. Follow the installation instructions provided with the arrestor.
2. Follow Article 280.
3. Make sure the terminals at which you connect the arrestor is listed, marked, or otherwise identified for the conductors to be terminated (more than one conductor, size of terminating conductor, torque, ect..) See 110.14 of the NEC.
 
Check the mfg requirements. I think you will find that they require a breaker
in the 30 amp range.
 
sorry missed some info. he said it had to be on the load side because it is less than 1000VAC and said 280.22. but i would like to put a 100A arrestor on the main to protect everything.
 
spectra, what does he think 280.21 is all about ?? As others have noted,

the Manf. instructions should let you know how it can be connected.
 
It can be a little rough to find a way to compliantly terminate a lightning arrestor on the line side anyhow, since the only available terminals are generally used by the SE conductors. I'm curious what you plan was there? The load side, on some panels, at least has a couple tapped holes in the buss pieces between the main breaker and the plug-on slots.

Most of these TVSS's are pretty clear that they want them connected to a double-pole 30 that is clipped in the panel.
 
stickelec said:
All other issues aside, there would be no performance improvement by installing it on the Line side.
Click to expand...

Don't know where you are but around here but here the POCO will put one on the load side of the meter. That tends to simplify matters sometimes.:wink:
 
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