ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Linear Power Supply Quits Under Load
by JoeTestingEngr. 10/18/18 08:47 PM
220/230/240V 60Hz Systems
by dsk. 10/17/18 01:25 PM
PLC/HMI Enclosure C2, D1
by ghost307. 10/16/18 03:31 PM
Tingle off the water spigot
by dsk. 10/15/18 02:36 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 3 guests, and 25 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
NFPA 70E Question #174309
02/01/08 06:20 PM
02/01/08 06:20 PM
M
MikeF  Offline OP
New Member
Joined: Feb 2008
Posts: 3
Ca.
Is flash PPE required inside the limited/restricted approach boundaries or not until the prohibited approach boundary is crossed? Can a visual inspection be done from the restricted zone without flash PPE?
Thanks, Mike

Arc Flash PPE Clothing, LOTO & Insulated Tools
Re: NFPA 70E Question [Re: MikeF] #174313
02/01/08 07:13 PM
02/01/08 07:13 PM
G
Gregtaylor  Offline
Member
Joined: Mar 2005
Posts: 212
Boise, Idaho, USA
This is one of the places where the NFPA 70E rules become very confusing. The boundaries you refer to are for SHOCK hazard, not flash hazard. Flash hazard and boundaries are calculated individually for the circumstance. The way it usually works out is that flash hazard PPE would be required within the shock hazard restricted/prohibited zones but not the limited zone. This is not always true however. Very high energy circumstances could extend the flash hazard areas well outside the shock hazard limited zone.

Re: NFPA 70E Question [Re: MikeF] #174314
02/01/08 07:15 PM
02/01/08 07:15 PM
G
ghost307  Offline
Member
Joined: May 2005
Posts: 958
Chicago Illinois USA
PPE is needed in order to enter the limited/restricted zone.
Nothing will allow you to enter the prohibited zone and survive if there is an event.

You would need to de-energize the equipment (and make the prohibited zone go to zero) if you want to get that close to the equipment.


Ghost307
Re: NFPA 70E Question [Re: ghost307] #174318
02/01/08 08:20 PM
02/01/08 08:20 PM
M
MikeF  Offline OP
New Member
Joined: Feb 2008
Posts: 3
Ca.
Definitely confusing....so SHOCK protection really amounts to rubber gloves, correct? FLASH protection is everything else? And if a flash approach boundary is determined to be at 4 feet, then all the other boundaries are pretty much out the window (?). Full protection from 4 feet in, in that situation?
Thanks so much!

Re: NFPA 70E Question [Re: MikeF] #174379
02/03/08 12:01 PM
02/03/08 12:01 PM
Z
Zog  Offline
Member
Joined: Sep 2005
Posts: 120
Charlotte, NC
Mike your answer is corrct assuming this is 600V or less we are talking about.

Ghost you seem to have the Arc Flash and Shock boundaries confused.

Greg, well put.

LAB may only be crossed by Qualified Personel (As defined in the 70E). RAB requires shock protection, usually just means gloves but can be more. PAB should be treated as the boundary you never cross but special training and hazard analysis would allow crossing. Shock boundaries only apply if there are exposed live parts.

Neither of these have anything to do with the arc flash boundary, the shock boundaries are dependant on voltage, the flash boundary has nothing to do with voltage levels, it is based on available fault current and clearing time of the protective device. PPE for flash protection must be worn any time you cross the Arc Flash boundary and "interact" with the equipment, weather the live parts are exposed or covered.


MV/HV Testing Specialist, "BKRMAN"

Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Theelectrikid
Theelectrikid
Levittown, PA
Posts: 810
Joined: April 2004
Show All Member Profiles 
Top Posters(30 Days)
sparky 11
Popular Topics(Views)
250,578 Are you busy
188,114 Re: Forum
177,762 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.023s Queries: 15 (0.005s) Memory: 0.9694 MB (Peak: 1.1094 MB) Zlib enabled. Server Time: 2018-10-22 03:35:44 UTC