Questions tagged [creepage]

Creepage is the separation between two conductors as measured along the surface/layers of a board

Filter by
Sorted by
Tagged with
2 votes
1 answer
42 views

Question on IEC61010: Secondary circuit insulation requirement (creepage & clearance) [closed]

How does one decide if a particular isolation is required to meet creepage/clearance? Do all insulators have to conform to the creepage/clearance requirement? In my design, I have a receiver circuit ...
Cyclone1's user avatar
4 votes
0 answers
64 views

Mixed pollution degree creepage distance

Say you need to comply with a creepage distance but you can't do it under a specific pollution degree. I had 2 scenarios where I had mixed pollution degrees: The creepage distance is almost enough ...
HatimB's user avatar
  • 896
0 votes
0 answers
125 views

Altium throws unjustly creepage violations

In my project, I have several rules set for creepage. I get 12 violations on this rule, but always between the polygon and a pad or via. This is strange because the polygon is drawn by Altium ...
hgerrebrands's user avatar
3 votes
3 answers
328 views

How to interpret External Clearance spec on HCPL3700M IC?

The spec for the HCPL3700M (AC voltage detection IC) lists an "External Clearance" of ≥7.4mm. Is this saying that no component or exposed trace should be within 7.4mm on any side of the chip?...
user272901's user avatar
0 votes
3 answers
103 views

Creepage distance in a solid state relay

My circuit has a driver TRIAC optocoupler and a TRIAC. I want to replace this combination with a solid state relay. The TRIAC optocoupler datasheet explicitly specifies the creepage distance (distance ...
spani's user avatar
  • 1
1 vote
1 answer
39 views

Creepage points of v notches

Why does the creepage between two conductor points be determined separately for V-notches as compared to grooves? Why does it short-circuit in the air the bottom and doesn't go through the whole notch ...
Robert's user avatar
  • 11
0 votes
1 answer
71 views

Digital Isolator Layout - Creepage

In the Digital Isolator Design Guide from Ti, there are some PCB Design Guidelines regarding Creepage. In addition to wide isolator packaging, techniques such as grooves can be used to attain a ...
Rev's user avatar
  • 10.1k
3 votes
2 answers
822 views

What can I do about components with inadequate creepage?

I'm designing a device for use in a non-climate-controlled environment (garage, shed, etc.) If I understand it correctly, this puts me directly into pollution group 3 unless I can also engineer it to ...
Matthew's user avatar
  • 572
9 votes
2 answers
842 views

What is a correct method to measure safe maximum voltage of a PCB?

I have a small (24 x 15 mm) PCB for a custom connector. It is intended for low voltage (< 48 VDC) applications, but I am interested in measuring it in order to provide customers a reasonable ...
JYelton's user avatar
  • 34.1k
3 votes
1 answer
1k views

Creepage between layers on a PCB

I'm currently designing a power supply with high isolation between primary and secondary sides and have to comply to standard distances on clearance and creepage. My question is regarding creepage, I ...
anzorein's user avatar
1 vote
1 answer
95 views

Why transmission insulators have a particular shape?

What I have gathered is that to increase the creepage distance (the shortest distance along the surface of solid insulating material between two conductive parts) they have designed a particular shape....
Ankit Kumar Vishwakarma's user avatar
0 votes
0 answers
486 views

EN 61010 Creepage and Clearance questions

My PCB has to meet EN 61010 safety standard and i had a question regarding creepage and clearance values. Has anyone got any experience applying this standard and when the creepage and clearance ...
Noj911's user avatar
  • 21
6 votes
3 answers
2k views

Creepage for printed boards / printed wiring material and IEC 60664

In IEC 60664-1:2021 table F.5 (former F.4): Creepage distances to avoid failure due to tracking or 60950-1:2005 Table 2N – Minimum creepage distances the second and third columns are applicable for &...
Hellfish's user avatar
0 votes
2 answers
272 views

PCB clearance/creepage with dead metal

I have PCB design where there are two pads the may be shorted (manually in assembly) or left as is, depending on the product model. The through hole circular pad is actually for a terminal block. I ...
user139731's user avatar
1 vote
1 answer
425 views

Galvanically isolated voltage PCB track clearance requirements

I am designing a PCB to switch high voltage (440VAC) from a microcontroller. In this project, the 440VAC voltage is galvanically isolated from the microcontroller circuit. I am using an opto-coupler ...
SKGadi's user avatar
  • 862
1 vote
1 answer
369 views

Creepage and Clearance for Connectors

I’m looking to mount SMT pogo pins on a PCB. The connectors will see a maximum working voltage of 120VDC between any two pins, but only when connected to their corresponding female header. If the ...
cdubs's user avatar
  • 415
4 votes
2 answers
1k views

Does recommended creepage distance apply to copper planes under soldermasks?

I have a design that requires around 0.5mm of creepage distance between conductors. TI said in this video that "creepage is the shortest distance between two uninsulated conductors along the ...
Never's user avatar
  • 100
1 vote
1 answer
4k views

IEC 61010 table for creepage distances

Good day I am making a pcb layout that is required to comply with the IEC 61010-1. In the standard, there is a table for clearances and creepages, which depends on working voltage, pollution degree ...
user139731's user avatar
0 votes
0 answers
212 views

Required creepage distance & clearance in high temp. (600~1000℃) for high voltage DC system (400V)

We have a high voltage battery pack. During abuse test, the Li-ion cells will eject lots of hot gas and graphite. These ejection will cause short circuit which is definitely not wanted. I want to know ...
Mei sy's user avatar
  • 193
0 votes
0 answers
84 views

Can creepage distance be separated into more sections?

Can I count that the creepage distance of two separate circuits can be divided into two sections, while the inner conductive pad/track is isolated/floating? Similarly, can I use two resistors (200V ...
Jan Riha's user avatar
  • 137
0 votes
1 answer
650 views

for calculating the number of insulator disks needed for creepage is line to line voltage or phase voltage used?

For example, I am calculating the number of disks required for a 330kV line. Assuming medium pollution (20mm/kV) and each disk having 405mm would my number of disks be 17 (based off line voltage) or ...
Chris's user avatar
  • 1
1 vote
2 answers
590 views

Does silkscreen help with voltage creepage distance?

I have seen on various mains powersupply PCBs that they have a lot of silkscreen lines near the high voltage areas. So my question is that does the silkscreen helps rise the voltage rating of that ...
IMFROST's user avatar
  • 13
4 votes
0 answers
387 views

IEC60950-1 - Does soldermask reduce creepage to pollution degree 1?

Since creepage distance requirements across a PCB are at least partially due to the potential of conductive pollution, is soldermask a sufficient coating to reduce fully covered traces to pollution ...
A.Mac's user avatar
  • 400
1 vote
1 answer
587 views

Clearance and creepage for AC Optocoupler for 230V line detection

I was wondering how I need to handle clearance and creepage in this scenario. It's AC mains line detection circuit. I need to achieve around 2.5mm creepage.
Toon Van Eyck's user avatar
5 votes
3 answers
2k views

Why does increasing altitude (low air pressure) results in lower resistivity/ breakdown voltage?

I got this question because the creepage and clearance distances need to be adjusted for altitude. The higher the altitude, the higher the distances should be. It seems to me however that the contrary ...
HatimB's user avatar
  • 896
1 vote
0 answers
73 views

Heatsink Crossing Primary and Secondary Sides in Switched-Mode Power Supply

I've taken apart a non-oem laptop power supply. There is clearance on the board between primary and secondary. However, they've placed a single heatsink across the board for the primary and secondary ...
Caesar Knight's user avatar
2 votes
2 answers
464 views

Proper implementation of creepage and clearance on high-voltage PCB

I am designing a 3-phase voltage detector based on optocouplers as shown below: simulate this circuit – Schematic created using CircuitLab For this I need to follow DIN 60664-1 and my biggest ...
Nexy_sm's user avatar
  • 409
6 votes
1 answer
652 views

Barrier and slot within reduced area on a PCB

Imagine this situation in a little area of your PCB: According to the worst case and used material, I need a creepage distance = 30mm. According some tables, clearance must be 30mm. First Red banana ...
Suvi_Eu's user avatar
  • 851
3 votes
5 answers
1k views

When to use slots instead of barriers in high voltage design?

I have read a lot of information about the clearance and creepage strategies, distances, materials, etc.. I am designing my first HV PCB, main LV circuit will be on TOP and HV (6KV) on the bottom. ...
Suvi_Eu's user avatar
  • 851
3 votes
1 answer
825 views

How can be creepage between two conductor points be determined for HV pcb design?

I have read about spacing at HV design and it seems to say that there are two main standards to be followed: IPC or UL (IEC). IPC is a generic and commonly used. But UL is the best option for designs ...
Suvi_Eu's user avatar
  • 851
0 votes
1 answer
288 views

crossing 240 V traces on both top and bottom sides of a 2 layer PCB

My situation is the same as the crossings encircled in white from Can I place 220V Live traces on top and bottom of PCB? Therefore, running Line traces on the top layer and Neutral traces on the ...
kellogs's user avatar
  • 1,062
0 votes
1 answer
66 views

Clearance distance and resin filler

I'm designing a circuit to detect presence of AC line voltage. It's actually a very simple device with AC side made up of a 200Kohm 1W resistor and an optocoupler and a protection diode. There will be ...
Farid83's user avatar
  • 477
2 votes
2 answers
236 views

Creepage on SMT DIP package with an NC pin

I'm having trouble understanding how the CPC1972GSTR can have the specs it does. Here's the datasheet. In particular, it has a blocking voltage spec of 800V, but if you look at the recommended ...
nsayer's user avatar
  • 1,573
2 votes
2 answers
2k views

Maximum allowable voltage between PCB traces

I have some confusion regarding the guidelines for clearance between surface uncoated PCB traces (specifically component pads). IPC-2221 guidelines and other guidelines and standards indicate spacings ...
Edgar Brown's user avatar
  • 8,426
6 votes
2 answers
832 views

High Voltage Capacitor Lead Clearance

I am designing a high voltage board, 10,000 VDC. I wish to use a suitably rated capacitor such as the DHR4E4A102K2BB. When I have been studying the ...
tomdertech's user avatar
1 vote
2 answers
910 views

Creepage distance over pcb

How to measure creepage distance over pcb ? Is creepage and clearance distance measure by pbc layout or soldering?
Vikas Verma's user avatar
3 votes
1 answer
83 views

Insulation of SiC Diode

I am reading about creepage distance and clearance and came across a T0-247-3 SiC diode (IDW20G120C5B). This diode is rated for 1.2kV which would mean that it won't break down at let's say 800V, which ...
Autobot's user avatar
  • 155
1 vote
1 answer
876 views

Creepage distance get from UL840 note

I'm considering on creepage distances on my PCB. I have read UL840,there are two significant tables. 6.1 "Minimum acceptable creepage distances" and 6.2 "Minimum acceptable creepage distances on ...
M.Kruk's user avatar
  • 52
3 votes
1 answer
398 views

Proper way to route high-voltage tracks near THT components

I think this is not a duplicate of this question. My design has the following constraints: type and position of connectors pinout assignments 260 VDC / 2A for high-voltage tracks 12V / 200 mA for low-...
Mark's user avatar
  • 1,197
0 votes
0 answers
243 views

Creepage and clearance of through hole resistor

Recently I found a resistor broken on a PCB. It is a MOF type 1/2W through hole resistor. I found that the resistor is directly placing (touching) on a PCB Live trace and I know that the potential ...
eepty's user avatar
  • 309
2 votes
0 answers
265 views

Becoming crazy with EU LVD regulation in PCB and electric strength

First of all I will explain the design characteristics of my project to make clear what it is and where it enters for regulation. It is a fixed electric/electronic installation in offices so it can'...
Robotec's user avatar
  • 29
2 votes
1 answer
703 views

How to define working voltage class net to calculte the creepage?

I work of a project of single phase PFC converter and I need to define the working voltage to each each NET of Schematic to calculate creepage distance. I have a question about the low voltage of NET ...
user3212448's user avatar
2 votes
0 answers
914 views

Low Voltage PCB Creepage Requirements

Both 60950 (Table 2N – Minimum creepage distances) and 60335 (Table 18 – Minimum creepage distances for functional insulation) seem to specify a minimum creepage distance of 0.4mm (~16mil) with a IIIa ...
bt2's user avatar
  • 3,804
8 votes
2 answers
4k views

Will a cut or a slot in a PCB change clearance or creepage?

Does a cut or a slot in a printed circuit board increase clearance, creepage or both? Some say it will increase clearance, but I don't think clearance will change because, even with a cut in the PCB, ...
Bharav's user avatar
  • 782
0 votes
1 answer
3k views

How to measure creepage distance?

What points do you need to measure in PCB according to IEC 601? Is it the closest distance between any conductive parts? For example minimum air clearance for means of operator protection in secondary ...
nezinau's user avatar
  • 19
1 vote
0 answers
378 views

What is the common cause of short circuit in PCB design

In PCB design there is some clearance and creepage distances to respect according to the UL 60950 standard for example, I want to know why this distances need to be respected in PCB design, what is ...
Pakito's user avatar
  • 140
5 votes
1 answer
3k views

Ethernet LED & Diffpair Clearance

How do you maintain creepage distance between diff pairs and the LED terminals on an Ethernet connector? My understanding is that based on EN60950, for 250V IT equipment, the air clearance is 2mm and ...
philby's user avatar
  • 305
5 votes
1 answer
617 views

How does a fuse affect creepage reqirements?

I am designing a mains-powered device that has to comply with IEC 60079-15 (Non-incedive industrial eqipment). Creepage distances in this standard are inherited from IEC 60664, pollution degree 3. For ...
venny's user avatar
  • 3,068
1 vote
1 answer
830 views

pollution degree and creepage distance

I read in some books that pollution degree can influence the creepage distance in electronic circuits, is there any relation (mathematical) between the pollution degree and the creepage distance.
R Djorane's user avatar
  • 1,810
1 vote
1 answer
4k views

Clearance and creepage requirements in EU

I'm looking for the clearance and creepage requirements between live voltage (230V) and SELV (Safety Extra Low Voltage) in the EU. I had a look at this and other questions, but I rarely see numbers ...
Joris Groosman's user avatar