“Power/Bloc for Circuit Breaker
Lockout/Tagout”
Applications and Product Review
Overview – Measurement - Installation
2008
Power/Bloc
• PERMANENT - Permanently mounted in panels,
load centers, free-standing breakers (with 3M DP805
adhesive – no penetrating fasteners)
• UNIVERSAL - Fits any manufacturer – domestic,
foreign, custom-fabricated - of any age
• SIMPLE - Materials retained at the point of use
(except lock and/or tags)
• Patent #6,266,231
• Made in the USA
Power/Bloc
• Allows lockout of each individual breaker with no
restriction of access to other breakers
• Will lock out any length
• Fits any panel up to 600 volts and main breakers
up to 1600 amps
• Use with standard ¼″ shank diameter lock
• Use with group multi-lock hasp
• Use with small three tumbler lock and closed door
adapter for closed door operation
Power/Bloc
Meets or exceeds:
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OSHA Standard 29 CFR 1910.147
OSHA Standard 29 CFR 1910.269
NFPA 70E
ANSI Z244.1
MSHA Standard 30 CFR 56.12016
MSHA Standard 30 CFR 56.12017
MSHA Standard 30 CFR 57.12016
MSHA Standard 30 CFR 57.12017
CSA Z460
Power/Bloc Kits
• Color-coded, T-slotted anodized aluminum
channel
• Color-coded, non-conductive, adjustable
polymer bars (T or Hook design)
• Non-metallic holder(s) for T and Hook bars
to retain materials at point of use
• Label
Power/Bloc Design
Lock fits in slotted
channel above T or
Hook Bar providing
lockout until removal
5-inch T Bar
3 ½-inch Hook Bar
(bars are trimmed to fit for
breaker throw and panel center
measurement)
Power/Bloc Kit – High Profile (for
panels with depth of ¾″ or greater)
High Profile Panels
Power/Bloc Kit – Low Profile (for
panels with depth of less than 9/16″)
Low Profile Panels
Power/Bloc Ordering Options
• May be ordered as stock kit (21″ length) to
be field cut by facility staff
• May be provided as pre-cut kits, labeled for
specific panels/locations, based upon
measurements from site survey
Measurement/review of Panels
• Option to schedule facility survey by Safety
Design representative resulting in sitespecific quote and custom labeled and
fabricated kits (at no additional charge)
• Facility staff may survey and submit to
Safety Design representative for sitespecific quote
Ordering Protocol
• Orders accepted as Purchase Order, VISA,
MasterCard, or American Express
• Terms: Net 30
• Shipping: UPS Ground (unless specified
otherwise), Prepay and Add, FOB Factory
• Estimated Shipping Schedule: 2-3 weeks ARO,
contact representative for current lead times
Panel Measurement and Review
Measure length, top to bottom of
breakers
Measure width of center between
breakers
Measure depth of panel – panel
face to door
Power/Bloc
Measurement/Observations
• Does the panel have a
ridge down the center?
Wide or narrow ridge?
• Does the panel have a
V-shaped valley down
the center?
• Is there a metal holder
attached to the door
that would encroach
into the panel depth?
• Note: Power/Bloc is
provided as a High
Profile model for
panels with a depth of
¾″ or more or a Low
Profile model for
panels with a depth of
9/16″ or less. *This
measurement is
critical.
Power/Bloc
Measurement/Observations
• Does the level of the breakers sit above the panel
dead front or does the breaker design have a rim
that would require a shim to allow the Power/Bloc
channel to mount level with the breaker? How
high is the elevation?
• Are the breakers recessed below the panel dead
front? How deep is the depression?
• Does the panel have a Main Breaker?
I-Line Panels
Power/Bloc Installation
• Installation with 3M DP-805 two-part
acrylic adhesive
• Installation materials include dual adhesive
tube assembly, installation gun (or
conversion kit to allow use with a standard
caulking gun), and mixing tubes
Power/Bloc Installation Materials
Power/Bloc Kit and Installation
Materials
Power/Bloc Kit Notes
• If a facility survey has been conducted and
a site-specific proposal prepared, you will
receive custom fabricated kits as ordered
• Each kit will be labeled with the appropriate
panel (or location) designation and contain
all materials for that panel or load center
Panel Preparation
• Use of DP-805 adhesive allows installation
without removal of panel cover
• Scuff panel to bare metal for optimum
bonding and wipe area clean
• Use of solvents is not normally required but
wiping with isopropyl alcohol or
commercial de-greaser is recommended
Place 3M DP-805 in installation gun,
remove cap (retain for future use)
Dispense small amount of adhesive until two
part adhesive feeds evenly prior to adding
mixing tube; attach mixing tube to adhesive
firmly and twist for secure fit
Place 1/8″ bead of adhesive on entire
back of Power/Bloc channel
Alternate Installation with
Conversion Kit for Caulking Gun
I/ON
O/OFF
I/ON
I/ON
O/OFF
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I/ON
I/ON
O/OFF
O/OFF
I/ON
O/OFF
I/ON
O/OFF
I/ON
I/ON
O/OFF
O/OFF
I/ON
I/ON
O/OFF
O/OFF
O/OFF
I/ON
I/ON
I/ON
O/OFF
I/ON
O/OFF
I/ON
O/OFF
Align mid-point of
first two slots in
Power/Bloc
channel with
mid-point of top
breaker; center
Power/Bloc
channel in panel
O/OFF
Power/Bloc Installation
Place Power/Bloc channel in panel and
hold until set in place –
2-3 minutes working time – full cure in 24 hours
(follow placement instructions supplied with kit)
Quick release painters tape or
masking tape may be used to hold
channel in place until adhesive is
set.
If there is more than one
Power/Bloc channel to
accommodate the length of a
panel, attach the longest part on
top and place the additional piece
adjacent to the first piece.
Release pressure, discard mixing tube and recap adhesive at
end of installation or during significant time delay in
installation process. Adhesive setting up in mixing tube may
be delayed by wrapping in a damp cloth and placing on ice
pack during multiple kit installation process. Replace mixing
tube when adhesive begins to harden in tube.
Dual Power/Bloc Channels for Wide
Center Panel (> 3″)
Place 1/8″ bead of adhesive on
bar holders
Mount bar holder(s) in panel
Placement may
be horizontal or
vertical
Trim Stop/Loc bars to fit specific
panel and breaker throw
Before trimming –
T-bars are 5″ long
Hook bars are 3½″
long
Place Stop/Loc bars in panel to provide
materials at point of use. Place
identification label on panel, if desired
Small Main (where applicable)
Attach small strip in
proper location for
Stop/Loc bar to push
against small main
Power/Bloc with Individual Lock
Power/Bloc with Multi-Lock Hasp
Closed Door Bar for Use With
Tag or Small Lock
Power/Bloc with Small Lock for
Closed Door Operation
Power/Bloc Lockout/Tagout
Procedure Notes
• All appropriate electrical testing procedures
must be followed.
• The procedure detailed in this tutorial is designed
to refer only to the portion of the lockout or tagout
process that includes manipulation of the
components of the Power/Bloc system and is not
designed to be used as a comprehensive internal
procedure.
Power/Bloc Procedure for
Lockout
• De-energize selected breaker
• Remove Stop/Loc bar from holder (hook bar or Tbar), place in slotted channel and adjust to restrain
movement of breaker. Place individual lock,
multi-lock hasp with locks, or closed door bar
with small three tumbler lock in space above
Stop/Loc bar. Make sure all locks and tags are
attached securely.
Power/Bloc Procedure for Tagout
• Power/Bloc is designed as a system for tagout that
provides the added protection of a restraint device
with the simplicity and accessibility of a tagout
procedure, where allowed.
• The standard Power/Bloc kit is mounted in the
panel according to installation instructions.
• Remove Stop/Loc bar from holder (hook bar or Tbar), place in slotted channel and adjust to restrain
movement of breaker. Place closed door bar in
space above Stop/Loc bar. Attach tag to closed
door bar according to site procedure.
Power/Bloc Procedure for Tagout
• A Stop/Loc bar is used with a closed door bar and
tag assembly as specified by owner’s procedure to
prevent the selected circuit from being reenergized until the tag, closed door bar, and
Stop/Loc bar are removed.
* Note: Materials will be in place to allow future
conversion to a full lockout procedure, if desired.
Tag for ID of Critical Circuits
• Some facilities choose to use Power/Bloc with a
closed door bar and tag for ID and assistance in
prevention of accidental disconnection of a few
critical circuits.
• NOTE: Energized circuits should NEVER be
locked on.
LMHP for Large Breakers
Standard bar length is 8″
Available in other
lengths upon request.
Shims may be required.
LMHP for Large Breakers
Wide Center Panels
Panels with center width
over 3″ requiring
(2) Power/Bloc channels
Individual Molded Case Breaker
Power/Bloc may be attached
directly to molded case
circuit breaker with
3M DP-805 adhesive
Multiple Circuit Lockout
Multiple circuits may
be locked out with
minimal locks, if
desired. Contact
factory for details.
Other Applications
DIN Rail
Mounting
bracket
to raise
Power/Bloc
channel to
level of
breaker may
be required
Other Applications
Rotary Operator
Other Applications
• You are invited to present other electrical
lockout challenges for review; we are
frequently able to assist with solutions.
• Digital pictures are helpful for review.
Training Materials
Power/Bloc training
board is supplied (at no
charge) to our clients to
use in their training
program.
This training board may
be used with this tutorial.
Power/Bloc by Safety Design,
Inc.
• Consult website at www.powerbloc.com for
measurement survey forms.
• Contact Betty Wayman, Strategic Accounts
Manager, Safety Design, Inc. with questions or
comments.
• E-mail: waymanbw@powerbloc.com
• Mobile: 615-310-9793
• TEL: 615-292-8744
• FAX: 615-297-0842