Exit lighting

[AWQ12]

Are battery back up required for exit lights if data center is on A side and B side generators feeding building??

 

[iwire]

The generators supplying a data center would be optional standby generators not emergency generators.

That being the case they do not count as an emergency source for egress lighting.

 

[ron]

As mentioned, exit lighting is required and needs to have required power. If the gens are Article 702 type (not emergency), then you need an emergency system for the exit lights (often batteries) of some type so they run during an outage.

 

[ron]

As a side note, I have worked in a jurisdiction that required 702 generators to also power exit lighting in addition to the unit batteries.

 

[iwire]

As a side note, I have worked in a jurisdiction that required 702 generators to also power exit lighting in addition to the unit batteries.

Did they have an amendment or was it just 'this is how we do it here'?

 

[ron]

Did they have an amendment or was it just 'this is how we do it here'?

For those interested in this condition

http://www.nyc.gov/html/dob/apps/pd...apter_27_Electrical.pdf&section=conscode_2014

2702.4 Required loads for optional standby power systems.
In addition to any other loads, optional standby power systems shall be capable of providing power to the following systems upon failure of the normal power supply or the emergency or standby power system:
1.Emergency lighting;
2.Fire alarm systems; and
3.Elevators as follows:
3.1 For Group R-2 occupancies in buildings greater than 125 feet (38 100 mm) in height, at least one elevator serving all floors, or one elevator per bank where different banks serve different portions of the building; or
3.2 For all other buildings having occupied floors located more than 75 feet (22 860 mm) above the lowest level of fire department vehicle access, at least one elevator that serves all floors.

 

[iwire]

For those interested in this condition

http://www.nyc.gov/html/dob/apps/pd...apter_27_Electrical.pdf&section=conscode_2014

2702.4 Required loads for optional standby power systems.
In addition to any other loads, optional standby power systems shall be capable of providing power to the following systems upon failure of the normal power supply or the emergency or standby power system:
1.Emergency lighting;
2.Fire alarm systems; and
3.Elevators as follows:

Wow.

They really do not seem to understand what the word optional means.

 

[ron]

Wow.

They really do not seem to understand what the word optional means.

It was a killer recently because the client only had a small amount of optional loads, but it was in a highrise, and the elevator was more than twice the load of the actually requested optional load.

 

[iwire]

It was a killer recently because the client only had a small amount of optional loads, but it was in a highrise, and the elevator was more than twice the load of the actually requested optional load.

This really bothers me, to me this is heavy handed rule making.

 

[mgookin]

When we get hit by a big hurricane in FL the grid can go down for weeks (or longer). We have similar requirements but not via NEC amendments; by separate statute.

highrise elevators,
fuel dispensers on evacuation routes,
etc.

 

[iwire]

When we get hit by a big hurricane in FL the grid can go down for weeks (or longer). We have similar requirements but not via NEC amendments; by separate statute.

highrise elevators,
fuel dispensers on evacuation routes,
etc.

Still not right to require optional equipment to be oversized.

If those areas have problems that require generators it should be handled by laws requiring generators.

 

[AWQ12]

Exit lighting

Thanks for the info !