Hi Jay,
I don't think it is as easy as an 'authorized personnel only sign'. As an
energy source, the batteries are going to require specific labelling.
Certainly your AHJ has the final word, however if the structures are insured,
any failure will be scrutinized closely during a claim.
I am assuming NEC 2017 applies to you. If so here are a few references:
480.7(D) - DC Disconnect Methods
(D) Notification. The disconnecting means shall be legibly
marked in the field. A label with the marking shall be placed
in a conspicuous location near the battery if a disconnecting
means is not provided. The marking shall be of sufficient durability
to withstand the environment involved and shall include
the following:
(1) Nominal battery voltage
(2) Maximum available short-circuit current derived from the
stationary battery system
(3) Date the short-circuit current calculation was performed
(4) The battery disconnecting means shall be marked in accordance
with 110.16.
Informational Note No. 1: Battery equipment suppliers can provide
information about short-circuit current on any particular
battery model.
Informational Note No. 2: The available short-current marking(s)
addressed in 480.7(D)(2) is related to required short-circuit current
ratings of equipment. NFPA 70E-2015, Standard for Electrical
Safety in the Workplace, provides assistance in determining
the severity of potential exposure, planning safe work practices,
and selecting personal protective equipment.
690.71 refers you to 706
706.7 Disconnecting means (basically a duplication of 480.7)
(D) Notification. The disconnecting means shall be legibly
marked in the field. The marking shall meet the requirements of
110.21(B) and shall include the following:
(1) Nominal ESS voltage
(2) Maximum available short-circuit current derived from the ESS
(3) The associated clearing time or arc duration based on the
available short-circuit current from the ESS and associated
overcurrent protective devices if applicable
(4) Date the calculation was performed
Exception: The labeling in 706.7(D)(1) through (D)(4) shall
not be required if an arc flash label is applied in accordance
with acceptable industry practice.
Informational Note No. 1: Industry practices for equipment labeling
are described in NFPA 70E-2015, Standard for Electrical
Safety in the Workplace. This standard provides specific criteria
for developing arc-flash labels for equipment that provides nominal
system voltage, incident energy levels, arc-flash boundaries, minimum
required levels of personal protective equipment, and so forth.
Informational Note No. 2: Battery equipment suppliers can provide
information about short-circuit current on any particular
battery model.
706.11 Directory.
ESS shall be indicated by 706.11(A) and (B).
The markings or labels shall be in accordance with 110.21(B).
(A) Directory. A permanent plaque or directory denoting all
electric power sources on or in the premises shall be installed at
each service equipment location and at locations of all electric
power production sources capable of being interconnected.
Exception: Installations with large numbers of power production
sources shall be permitted to be designated by groups.
(B) Facilities with Stand-Alone Systems. Any structure or
building with an ESS that is not connected to a utility service
source and is a stand-alone system shall have a permanent plaque
or directory installed on the exterior of the building or structure
at a readily visible location acceptable to the authority having
jurisdiction. The plaque or directory shall indicate the location
of system disconnecting means and that the structure contains a
stand-alone electrical power system.
Hope this helps.
-Glenn
-----Original Message-----
From: RE-wrenches <[email protected]> On Behalf Of Jay
Sent: Monday, August 12, 2019 11:04 AM
To: RE-wrenches <[email protected]>
Subject: [RE-wrenches] Offgrid labeling questions
Hi All
My question is about labeling the following.
I’ve got a fully offgrid system enclosed in a dedicated power shed, 250’ away
from the house.
AC is routed to a main panel external on the house. So no need to enter power
shed to shut off the house.
48v battery
150v max pole mounts
120/240v, outback
Backup generator installed just outside of the power shed.
I’m confused as to what labeling I need in the power shed.
And
Can I get away with a “authorization personal only” on the door instead? And
if so what would be the code reference
Thx
Jay
_______________________________________________
List sponsored by Redwood Alliance
List Address: [email protected]
Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
List-Archive:
http://www.mail-archive.com/[email protected]/maillist.html
List rules & etiquette:
www.re-wrenches.org/etiquette.htm
Check out or update participant bios:
www.members.re-wrenches.org
_______________________________________________
List sponsored by Redwood Alliance
List Address: [email protected]
Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
List-Archive:
http://www.mail-archive.com/[email protected]/maillist.html
List rules & etiquette:
www.re-wrenches.org/etiquette.htm
Check out or update participant bios:
www.members.re-wrenches.org
