RE: Fuse Markings

[James, Chris]

If the power brick is only intended for removal by a qualified service
Engineer, the marking need only be applied to the external rear panel
visible to the user - based on my experience of having units qualified to EN
60065. 

Chris

-Original Message-
From: Davis, Mike [mailto:mike_da...@adc.com]
Sent: 25 January 2001 20:16
To: EMC-PSTC Regulatory E-Mail (E-mail)
Subject: Fuse Markings



Thanks to all who responded to my question of what are the letter
designations for blow open speeds of fuses.

The consensus of responses were the following:

N 60127-1 1991 Clause 6.1d

FF: denoting very quick acting
F: denoting quick acting
M: denoting medium time-lag
T: denoting time-lag
TT: denoting long time-lag

I have another question. 

A slide in power supply module has an externally accessible and replaceable
fuse located at the rear panel of the module.  When the power supply module
is inserted into the chassis, the fuse is then only is accessible through a
slot in the rear panel of the chassis. Where is the appropriate place to
locate the power ratings; on the chassis rear panel, the module rear panel
or both. 
Service personnel has a choice to either replace the fuse from the rear of
the chassis or merely remove the power supply module, then replace the fuse.

Michael S. Davis
Compliance Engineer
ADC BATG Compliance Engineering
Tel:  203 630-5788
Fax:  203 630-5762
mike_da...@adc.com  


Learn about ADC - The Broadband Company at www.adc.com 



 

---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.

To cancel your subscription, send mail to:
 majord...@ieee.org
with the single line:
 unsubscribe emc-pstc

For help, send mail to the list administrators:
 Jim Bacher:  jim_bac...@mail.monarch.com
 Michael Garretson:pstc_ad...@garretson.org

For policy questions, send mail to:
 Richard Nute:   ri...@ieee.org


---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.

To cancel your subscription, send mail to:
 majord...@ieee.org
with the single line:
 unsubscribe emc-pstc

For help, send mail to the list administrators:
 Jim Bacher:  jim_bac...@mail.monarch.com
 Michael Garretson:pstc_ad...@garretson.org

For policy questions, send mail to:
 Richard Nute:   ri...@ieee.org

RE: Fuse Markings

[Chris Maxwell]

Mike,

Page 22 of our company copy of EN 61010-1:1993 refers to:

very fast = FF or black
fast  = F or red
medium, time-lag = M or yellow
time-lag = T or blue
long time-lag = TT or grey

There is a reference to these code/color designations coming from IEC 127.

There are some other "trade" fuse designations such as "slo-blo".  My
experience is that "slo-blo" has similar ratings to a type "T" fuse
according to IEC 127.  Of course, you have to check the manufacturer's data
sheets to see what standard they used for ratings ...

Hope this helps.

Chris.

> -Original Message-
> From: Davis, Mike [SMTP:mike_da...@adc.com]
> Sent: Thursday, January 25, 2001 11:09 AM
> To:   EMC-PSTC Regulatory E-Mail (E-mail)
> Subject:  Fuse Markings
> 
> 
> I am in the process of updating markings for power ratings on a product
> that
> needs a marking for a FAST blow fuse. Is there a reference out there that
> shows the letter designations for the various blow open speeds? I looked
> in
> the IEC 417 and in UL1950 3rd edition to no avail. The search goes on.
> 
> Michael S. Davis
> Compliance Engineer
> ADC BATG Compliance Engineering
> Tel:  203 630-5788
> Fax:  203 630-5762
> mike_da...@adc.com
> 
>   
> Learn about ADC - The Broadband Company at www.adc.com 
> 
> 
> 
>  
> 
> ---
> This message is from the IEEE EMC Society Product Safety
> Technical Committee emc-pstc discussion list.
> 
> To cancel your subscription, send mail to:
>  majord...@ieee.org
> with the single line:
>  unsubscribe emc-pstc
> 
> For help, send mail to the list administrators:
>  Jim Bacher:  jim_bac...@mail.monarch.com
>  Michael Garretson:pstc_ad...@garretson.org
> 
> For policy questions, send mail to:
>  Richard Nute:   ri...@ieee.org
> 

---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.

To cancel your subscription, send mail to:
 majord...@ieee.org
with the single line:
 unsubscribe emc-pstc

For help, send mail to the list administrators:
 Jim Bacher:  jim_bac...@mail.monarch.com
 Michael Garretson:pstc_ad...@garretson.org

For policy questions, send mail to:
 Richard Nute:   ri...@ieee.org

Re: Fuse Markings

[john . merrill]

The IEC standard is IEC127 which has requirements for Very Fast, Fast, Delay,
Long Delay and M (Medium?) along with breaking current capacity codes.





"Davis, Mike"  on 01/25/2001 11:08:33 AM

Please respond to "Davis, Mike" 

To:   "EMC-PSTC Regulatory E-Mail (E-mail)" 
cc:(bcc: John Merrill/Aut/Schneider)
Subject:  Fuse Markings





I am in the process of updating markings for power ratings on a product that
needs a marking for a FAST blow fuse. Is there a reference out there that
shows the letter designations for the various blow open speeds? I looked in
the IEC 417 and in UL1950 3rd edition to no avail. The search goes on.

Michael S. Davis
Compliance Engineer
ADC BATG Compliance Engineering
Tel:  203 630-5788
Fax:  203 630-5762
mike_da...@adc.com


Learn about ADC - The Broadband Company at www.adc.com





---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.

To cancel your subscription, send mail to:
 majord...@ieee.org
with the single line:
 unsubscribe emc-pstc

For help, send mail to the list administrators:
 Jim Bacher:  jim_bac...@mail.monarch.com
 Michael Garretson:pstc_ad...@garretson.org

For policy questions, send mail to:
 Richard Nute:   ri...@ieee.org









---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.

To cancel your subscription, send mail to:
 majord...@ieee.org
with the single line:
 unsubscribe emc-pstc

For help, send mail to the list administrators:
 Jim Bacher:  jim_bac...@mail.monarch.com
 Michael Garretson:pstc_ad...@garretson.org

For policy questions, send mail to:
 Richard Nute:   ri...@ieee.org

Re: Fuse Markings

[JRadomski]

Mike,

Fuse-holders shall be marked with the symbol relative to the time/current
characteristic (F or T), the rated current (mA or A), and the rated voltage
(V) of the fuse.
Examples: F250mA 250V (fast acting)
  T3A 250V ("slow blow")

John Radomski
Product Compliance Engineer
Clare




   
"Davis, Mike"   
   
  
   
Sent by: cc:
   
owner-emc-pstSubject: Fuse Markings 
   
c...@ieee.org   
  

   

   
01/25/01
   
11:08 AM
   
Please  
   
respond to  
   
"Davis, Mike"   
   

   

   





I am in the process of updating markings for power ratings on a product
that
needs a marking for a FAST blow fuse. Is there a reference out there that
shows the letter designations for the various blow open speeds? I looked in
the IEC 417 and in UL1950 3rd edition to no avail. The search goes on.

Michael S. Davis
Compliance Engineer
ADC BATG Compliance Engineering
Tel:  203 630-5788
Fax:  203 630-5762
mike_da...@adc.com


Learn about ADC - The Broadband Company at www.adc.com





---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.

To cancel your subscription, send mail to:
 majord...@ieee.org
with the single line:
 unsubscribe emc-pstc

For help, send mail to the list administrators:
 Jim Bacher:  jim_bac...@mail.monarch.com
 Michael Garretson:pstc_ad...@garretson.org

For policy questions, send mail to:
 Richard Nute:   ri...@ieee.org







---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.

To cancel your subscription, send mail to:
 majord...@ieee.org
with the single line:
 unsubscribe emc-pstc

For help, send mail to the list administrators:
 Jim Bacher:  jim_bac...@mail.monarch.com
 Michael Garretson:pstc_ad...@garretson.org

For policy questions, send mail to:
 Richard Nute:   ri...@ieee.org

RE: Fuse Markings

[Veit, Andy]

Mike-
My copy of EN 61010-1 gives the codes from IEC 127.  I'm not sure of this is
what you are looking for or not.

>From EN 61010-1:
Very Quick Acting   FF, or black
Quick ActingF, or red
Medium Time-Lag M, or yellow
Time-LagT, or blue
Long Time-Lag   TT, or grey

EN 61010-1 also says that if the fuse is user-replaceable, then the fuse
rating and type (using the above codes) shall be marked beside the
fuseholder.

-Andy

Andrew Veit
Systems Design Engineer
MTS Systems Corp
Ph: 919.677.2507
Fax: 919.677.2480
1001 Sheldon Drive 
Cary, NC 27513 


-Original Message-
From: Davis, Mike [mailto:mike_da...@adc.com]
Sent: Thursday, January 25, 2001 11:09 AM
To: EMC-PSTC Regulatory E-Mail (E-mail)
Subject: Fuse Markings



I am in the process of updating markings for power ratings on a product that
needs a marking for a FAST blow fuse. Is there a reference out there that
shows the letter designations for the various blow open speeds? I looked in
the IEC 417 and in UL1950 3rd edition to no avail. The search goes on.

Michael S. Davis
Compliance Engineer
ADC BATG Compliance Engineering
Tel:  203 630-5788
Fax:  203 630-5762
mike_da...@adc.com  


Learn about ADC - The Broadband Company at www.adc.com 



 

---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.

To cancel your subscription, send mail to:
 majord...@ieee.org
with the single line:
 unsubscribe emc-pstc

For help, send mail to the list administrators:
 Jim Bacher:  jim_bac...@mail.monarch.com
 Michael Garretson:pstc_ad...@garretson.org

For policy questions, send mail to:
 Richard Nute:   ri...@ieee.org


---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.

To cancel your subscription, send mail to:
 majord...@ieee.org
with the single line:
 unsubscribe emc-pstc

For help, send mail to the list administrators:
 Jim Bacher:  jim_bac...@mail.monarch.com
 Michael Garretson:pstc_ad...@garretson.org

For policy questions, send mail to:
 Richard Nute:   ri...@ieee.org

RE: Fuse Markings

[Allen, John]

Mike

I believe that you will find the international markings in one of the parts
of IEC60127 (was IEC127).

Although I have'nt got the standards to hand, and if I remember correctly,
typically these markings are: 

"FF"=   Very Fast
"F" =   Fast/Normal 
"T" =   Slow/Time Delay/Slow-Blo
"TT"=   Very Slow 

Thus typical ratings could be: 
- T3.15A + voltage rating for a time-delay fuse
- F3.15A + voltage rating for a fast/normal blow fuse.

By comparison, USA fuses tend to be marked with the words (in "American"
English!).

There also some special fuses around for semiconductor protection - butI
cannot remember the details.

Fuseholder markings must match fuse-ratings if in an Operator-accessible
area.

Also bear in mind that the marked ratings of fuses to UL/Canadian standards
and IEC standards are often different (e.g 3A USA v 3.15A IEC) and they have
different blow characteristics - follow some of the earlier threads on the
RCIC forum for more information.

John Allen
THALES Defence Ltd
Bracknell, UK




-Original Message-
From: Davis, Mike [mailto:mike_da...@adc.com]
Sent: 25 January 2001 16:09
To: EMC-PSTC Regulatory E-Mail (E-mail)
Subject: Fuse Markings



I am in the process of updating markings for power ratings on a product that
needs a marking for a FAST blow fuse. Is there a reference out there that
shows the letter designations for the various blow open speeds? I looked in
the IEC 417 and in UL1950 3rd edition to no avail. The search goes on.

Michael S. Davis
Compliance Engineer
ADC BATG Compliance Engineering
Tel:  203 630-5788
Fax:  203 630-5762
mike_da...@adc.com  


Learn about ADC - The Broadband Company at www.adc.com 



 

---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.

To cancel your subscription, send mail to:
 majord...@ieee.org
with the single line:
 unsubscribe emc-pstc

For help, send mail to the list administrators:
 Jim Bacher:  jim_bac...@mail.monarch.com
 Michael Garretson:pstc_ad...@garretson.org

For policy questions, send mail to:
 Richard Nute:   ri...@ieee.org


---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.

To cancel your subscription, send mail to:
 majord...@ieee.org
with the single line:
 unsubscribe emc-pstc

For help, send mail to the list administrators:
 Jim Bacher:  jim_bac...@mail.monarch.com
 Michael Garretson:pstc_ad...@garretson.org

For policy questions, send mail to:
 Richard Nute:   ri...@ieee.org

RE: Fuse Markings

[James, Chris]

EN 60127-1 1991 Clause 6.1d

FF: denoting very quick acting
F: denoting quick acting
M: denoting medium time-lag
T: denoting time-lag
TT: denoting long time-lag


Chris James
Engineering Services Manager
Dolby Laboratories Inc
Wootton Bassett
Wiltshire
SN4 8QJ
tel: 01793 842136
fax: 01793 842101
c...@dolby.co.uk
www.dolby.com



-Original Message-
From: Davis, Mike [mailto:mike_da...@adc.com]
Sent: 25 January 2001 16:09
To: EMC-PSTC Regulatory E-Mail (E-mail)
Subject: Fuse Markings



I am in the process of updating markings for power ratings on a product that
needs a marking for a FAST blow fuse. Is there a reference out there that
shows the letter designations for the various blow open speeds? I looked in
the IEC 417 and in UL1950 3rd edition to no avail. The search goes on.

Michael S. Davis
Compliance Engineer
ADC BATG Compliance Engineering
Tel:  203 630-5788
Fax:  203 630-5762
mike_da...@adc.com  


Learn about ADC - The Broadband Company at www.adc.com 



 

---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.

To cancel your subscription, send mail to:
 majord...@ieee.org
with the single line:
 unsubscribe emc-pstc

For help, send mail to the list administrators:
 Jim Bacher:  jim_bac...@mail.monarch.com
 Michael Garretson:pstc_ad...@garretson.org

For policy questions, send mail to:
 Richard Nute:   ri...@ieee.org


---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.

To cancel your subscription, send mail to:
 majord...@ieee.org
with the single line:
 unsubscribe emc-pstc

For help, send mail to the list administrators:
 Jim Bacher:  jim_bac...@mail.monarch.com
 Michael Garretson:pstc_ad...@garretson.org

For policy questions, send mail to:
 Richard Nute:   ri...@ieee.org

RE: Fuse Markings

[Andrews, Kurt]

Mike,

The following is from clause 5.1.4 of IEC 1010-1 which is for equipment for
measurement, control, and laboratory use. NOTE: IEC 127 is the standard that
International fuses are tested against. Apparently you can use letter or
color codes. 

The letter and color codes of IEC 127 are as follows:

Very quick acting:  FF, or black
Quick acting:   F, or red
Medium time lag:M, or yellow
Time-lag:   T, or blue
Long time-lag:  TT, or grey

Kurt Andrews
Compliance Engineer

Tracewell Systems, Inc.
567 Enterprise Drive
Westerville, Ohio 43081
voice:  614.846.6175
toll free:  800.848.4525
fax: 614.846.7791

http://www.tracewellsystems.com/  


-Original Message-
From:   Davis, Mike [SMTP:mike_da...@adc.com]
Sent:   Thursday, January 25, 2001 11:09 AM
To: EMC-PSTC Regulatory E-Mail (E-mail)
Subject:Fuse Markings


I am in the process of updating markings for power ratings on a
product that
needs a marking for a FAST blow fuse. Is there a reference out there
that
shows the letter designations for the various blow open speeds? I
looked in
the IEC 417 and in UL1950 3rd edition to no avail. The search goes
on.

Michael S. Davis
Compliance Engineer
ADC BATG Compliance Engineering
Tel:  203 630-5788
Fax:  203 630-5762
mike_da...@adc.com  


Learn about ADC - The Broadband Company at www.adc.com 



 

---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.

To cancel your subscription, send mail to:
 majord...@ieee.org
with the single line:
 unsubscribe emc-pstc

For help, send mail to the list administrators:
 Jim Bacher:  jim_bac...@mail.monarch.com
 Michael Garretson:pstc_ad...@garretson.org

For policy questions, send mail to:
 Richard Nute:   ri...@ieee.org


---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.

To cancel your subscription, send mail to:
 majord...@ieee.org
with the single line:
 unsubscribe emc-pstc

For help, send mail to the list administrators:
 Jim Bacher:  jim_bac...@mail.monarch.com
 Michael Garretson:pstc_ad...@garretson.org

For policy questions, send mail to:
 Richard Nute:   ri...@ieee.org

RE: Fuse Markings

[Colgan, Chris]

Mike

I certify products to IEC60065 and UL6500.  These standards require the use
of "F" for fast breaking fuses and "T" for time lag.  Eg F1.6A/250V or
T1.6A/250V.

Chris Colgan
Compliance Engineer
TAG McLaren Audio Ltd
The Summit, Latham Road
Huntingdon, Cambs, PE29 6ZU
*Tel: +44 (0)1480 415 627
*Fax: +44 (0)1480 52159
* Mailto:chris.col...@tagmclarenaudio.com
* http://www.tagmclarenaudio.com


> -Original Message-
> From: Davis, Mike [SMTP:mike_da...@adc.com]
> Sent: 25 January 2001 16:09
> To:   EMC-PSTC Regulatory E-Mail (E-mail)
> Subject:  Fuse Markings
> 
> 
> I am in the process of updating markings for power ratings on a product
> that
> needs a marking for a FAST blow fuse. Is there a reference out there that
> shows the letter designations for the various blow open speeds? I looked
> in
> the IEC 417 and in UL1950 3rd edition to no avail. The search goes on.
> 
> Michael S. Davis
> Compliance Engineer
> ADC BATG Compliance Engineering
> Tel:  203 630-5788
> Fax:  203 630-5762
> mike_da...@adc.com
> 
>   
> Learn about ADC - The Broadband Company at www.adc.com 
> 
> 
> 
>  
> 
> ---
> This message is from the IEEE EMC Society Product Safety
> Technical Committee emc-pstc discussion list.
> 
> To cancel your subscription, send mail to:
>  majord...@ieee.org
> with the single line:
>  unsubscribe emc-pstc
> 
> For help, send mail to the list administrators:
>  Jim Bacher:  jim_bac...@mail.monarch.com
>  Michael Garretson:pstc_ad...@garretson.org
> 
> For policy questions, send mail to:
>  Richard Nute:   ri...@ieee.org
> 


**  
   Please visit us at www.tagmclarenaudio.com
**

The contents of this E-mail are confidential and for the exclusive
use of the intended recipient. If you receive this E-mail in error,
please delete it from your system immediately and notify us either
by E-mail, telephone or fax. You  should not  copy, forward or 
otherwise disclose the content of the E-mail.

TAG McLaren Audio Ltd
The Summit, 11 Latham Road
Huntingdon, Cambs, PE29 6ZU
Telephone : 01480 415600 (+44 1480 415600)
Facsimile : 01480 52159 (+44 1480 52159)

**  
   Please visit us at www.tagmclarenaudio.com
**

---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.

To cancel your subscription, send mail to:
 majord...@ieee.org
with the single line:
 unsubscribe emc-pstc

For help, send mail to the list administrators:
 Jim Bacher:  jim_bac...@mail.monarch.com
 Michael Garretson:pstc_ad...@garretson.org

For policy questions, send mail to:
 Richard Nute:   ri...@ieee.org