Surge protection installation on disconnect, Line side or Load side?

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Cjmccarthy

Cjmccarthy

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Project Coordinator FDOT
I just did a walkthrough and I noticed that on the disconnect the surge protector (square D SDSA3650D) was installed on the load side. is that correct, or should it be on the line side? The disconnect powers a device cabinet with a lot of electronics, in the cabinet we have a surge protector also (HE 1800LED), and that one is connected to the load side as well. I have seen it both ways, is there a way that gives better protection?.20.4CABNS_08142023_074822 (2).jpg20.7CABNS_Surge is on the load side_08142023_091929 (2).jpg20.6CABNS_08142023_084322.jpg20.6CABSS_08142023_102500.jpg20.6CABSS_08142023_102506 (2).jpg
 
It really makes no difference.
I would not be surprised to find the vast majority of devices are on the load side of 'main devices'.
 
Violating the NEMA 3R rating by drilling a hole above the "waterline"?

Putting the sealing washer inside the cabinet?

The second picture does not match the third picture, and not a simple reverse image either?

If on the load side, when it shorts internally at least something local will take it off line instead of relying on the next fuse, sometimes the pole fuse.
 
I would check the manufacturer installation instructions as far as the surge protectors go but I believe they are fine to be on the load side
 
No need for grounding bushings on bottom ko
Much easier to use stranded GEC over solid. The GEC in the metallic raceway needs bonding bushing
 
A UL Type 1 SPD can be on the line side or load side. A UL Type 2 SPD can only be on the load side of the main.

Is the unit plugged into a QO™ or Homeline™ load center, or NQ panelboard?

According to the Schneider website:
Square D™ load center surge protective devices, SDSA3650D, are easy to install plug-in units that install as quickly as a standard circuit breaker. The surge suppressors use two pole spaces in a QO™ or Homeline™ load center, or NQ panelboard. US and Canadian UL® Listed as Type 2 SPD to the UL 1449 standard.

SDSA3650D - Surge protection device, Surgelogic, 40kA, 600 VAC delta, 3 phase, 4 wire, NEMA 4X | Schneider Electric USA

Schneider Electric USA. SDSA3650D - Surge protection device, Surgelogic, 40kA, 600 VAC delta, 3 phase, 4 wire, NEMA 4X.
www.se.com www.se.com
 
ron said:
A UL Type 1 SPD can be on the line side or load side. A UL Type 2 SPD can only be on the load side of the main.

Is the unit plugged into a QO™ or Homeline™ load center, or NQ panelboard?

According to the Schneider website:
Square D™ load center surge protective devices, SDSA3650D, are easy to install plug-in units that install as quickly as a standard circuit breaker. The surge suppressors use two pole spaces in a QO™ or Homeline™ load center, or NQ panelboard. US and Canadian UL® Listed as Type 2 SPD to the UL 1449 standard.

SDSA3650D - Surge protection device, Surgelogic, 40kA, 600 VAC delta, 3 phase, 4 wire, NEMA 4X | Schneider Electric USA

Schneider Electric USA. SDSA3650D - Surge protection device, Surgelogic, 40kA, 600 VAC delta, 3 phase, 4 wire, NEMA 4X.
www.se.com www.se.com
Click to expand...
we get FPL power at the Generator site, at the generator site it splits off into circuits feeding devices. at every device there is a disconnect and a transformer. The pictures attached are at a device location.
 
ron said:
According to the Schneider website:
Square D™ load center surge protective devices, SDSA3650D, are easy to install plug-in units that install as quickly as a standard circuit breaker. The surge suppressors use two pole spaces in a QO™ or Homeline™ load center, or NQ panelboard. US and Canadian UL® Listed as Type 2 SPD to the UL 1449 standard.

SDSA3650D - Surge protection device, Surgelogic, 40kA, 600 VAC delta, 3 phase, 4 wire, NEMA 4X | Schneider Electric USA

Schneider Electric USA. SDSA3650D - Surge protection device, Surgelogic, 40kA, 600 VAC delta, 3 phase, 4 wire, NEMA 4X.
www.se.com www.se.com
Click to expand...
Clearly the OP, in picture 2, shows a hardwired surge protector.
 
Krusscher said:
probably the 2 wires landed under a termination rated for 1 wire
Click to expand...
You're absolutely not wrong, but I do wonder how much of an issue two wires under one lug really is. I know I've done it when there absolutely wasn't another option, and not had any issues. Just place the smaller conductor behind the larger, and do a tug test to check.

It's one of those things that's gospel and part of the code, but might deserve another look.


SceneryDriver
 
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