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Recommended downstream protection

APC UPS Data Center & Enterprise Solutions Forum

Schneider Electric support forum for our Data Center and Business Power UPS, UPS Accessories, Software, Services, and associated commercial products designed to share knowledge, installation, and configuration.

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BillP
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Recommended downstream protection

This question was originally posted by eng.tohidi@gmail.com on APC forums on 1/6/2015


Dear All

Based on electrical characteristics of UPS Galaxy 5000 - 60 KVA, load current is about 87A but in installation manual section 2.4 recommended downstream protection is 20A and 32A circuit breaker.(see two attached image)

Can we use a circuit breaker in about 80A?

please guide us.

Best regards,

Tohidi

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BillP
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249

Re: Recommended downstream protection

This reply was originally posted by eng.tohidi@gmail.com on APC forums on 1/18/2015


Dear Angela,

Thank you for your reply. It was useful.

Now I have another question. Our UPS is Galaxy 5000 - 60 KVA and we have only one load with 70A.

Can we use one output breaker with 80A (for example NS80H MA  80A schneider compact circuit breaker)?

Best regards,

Tohidi

See Answer In Context

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BillP
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249

Re: Recommended downstream protection

This reply was originally posted by Angela on APC forums on 1/7/2015


Hello,

I asked our EMEA support on this. Here is what I received:

I don't see any issue with an 80A circuit Breaker so long as they use 35mm² Cable. That would comply with European norms.
The 20A and 32A circuit breaker seems to refer to the largest MCB on the sub-circuits.

BillP
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249

Re: Recommended downstream protection

This reply was originally posted by eng.tohidi@gmail.com on APC forums on 1/10/2015


Dear Angela

Thank you for your reply.

60 KVA UPS can provide 87A in output.

Why we can not use circuit breaker more than 20A and 32A.

Best regards,

Tohidi

BillP
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Re: Recommended downstream protection

This reply was originally posted by Angela on APC forums on 1/13/2015


Hi,

Here is some further information I can share:

When we talk about circuit breaker more than 20A and 32A., we are talking about the sub-circuits. We make this recommendation to avoid having the UPS going into bypass just because of a fault on one circuit. The main output breaker can be higher as long as there is sufficient discrimination.

You will find further information in this link:

http://www2.schneider-electric.com/documents/technical-publications/en/shared/electrical-engineering...

BillP
Administrator Administrator
Administrator
0 Likes
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250

Re: Recommended downstream protection

This reply was originally posted by eng.tohidi@gmail.com on APC forums on 1/18/2015


Dear Angela,

Thank you for your reply. It was useful.

Now I have another question. Our UPS is Galaxy 5000 - 60 KVA and we have only one load with 70A.

Can we use one output breaker with 80A (for example NS80H MA  80A schneider compact circuit breaker)?

Best regards,

Tohidi