SPD for 277/480

[electrofelon]

I have a customer that is hounding me to put in an SPD on a 277/480 wye 200 amp service. The service equipment is a Siemens MLO panelboard that currently has 3 service disconnects (BQD).

Questions:

1. Any product suggestions? I am generally a subscriber to 'you get what you pay for'. Leviton has one for about $5,000. Ouch, I was thinking more like a grand.
2. Should I connect it to a breaker or connect it directly to the service conductors (per 285.21). If a breaker, does size matter?
3. I thought there was a 3 but maybe not.

 

[LarryFine]

In my opinion, what matters most is the connected-equipment warranty; particularly the fine print.

You need to understand and compare the conditions, exclusions, and claim requirements of each.

 

[texie]

If you connect to the service conductors it has to be a Type 1. The hard part is how do you connect it in a compliant way due to lug issues. You could do a Type 1 or 2 and connect it to a branch breaker probably easier. The manufacturer will indicate the breaker size. Look at the usual... Eaton, Square D, etc.

 

[tom baker]

You may be looking at the leviton 52,000 series, I used those on large services as they had spd modules that could be replaced.
I typically used the 32,000 and 42,000 series, one on the service and one on subpanels.
Mike Holt once said, for SPDs
You get what you pay for
More is better

 

[synchro]

Mersen (was Ferraz Shawmut) is another brand to consider.

For example:

Mersen Surge Protector, 3 Phase, 277/480V, 3 Poles, 4 STXT480Y10A | Zoro

Order Mersen Surge Protector, 3 Phase, 277/480V, 3 Poles, 4, STXT480Y10A at Zoro.com. Great prices & free shipping on orders over $50 when you sign in or sign up for an account.

www.zoro.com

https://ferrazshawmutsales.com/pdfs/BR-Surge-Protection-Solutions-Brochure.pdf

 

[electrofelon]

Thanks guys. I like that Mersen, right about the price I had discussed with them and probably a step above some others I found that were around $600.

 

[hillbilly1]

I like to put them on a breaker, even though a hard surge could trip it, it’s much easier to replace when it does get blown. I’ve put in a lot of Liebert tvss’s

 

[Ragin Cajun]

I have specified, used, and still use those by Surge Suppression, LLC - SSI for many years. I specify the "all mode" design. Attended one of their seminars that were well documented and used actual surges to demonstrate the difference between manufacturers.

Surge Suppression, LLC

Surge Suppression manufactures multiple lines of SPDs for both AC and DC power systems as well as data and telecommunication systems from 5 to 7200 volts.

www.surgesuppression.com