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Commercial Electrical Advice

Discussions on Three Phase Supplies, three phase machinery and motors, DOL starters, phase sequence, running steel conduit, trunking and other questions on industrial and commercial electrical installations and maintenance. Commercial Electrical Talk. Also notice our Electrical Advice Forum and our Industrial Electrical Forum

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Sticky

RCD omission risk assessment

2 3 4 5

Replies: 64

Views: 29K

Oct 18, 2024

Bluetit

Sticky

Who can issue a Minor Works cert?

NotAPlumber
Dec 1, 2016

Replies: 10

Views: 25K

Jan 14, 2022

WishIwasAplumber

Sticky

3 phase immersion heaters in star (no N) or delta

2 3

Replies: 32

Views: 20K

Jun 21, 2018

Marvo

Sticky

am2 motor overload

maddad2001
Jul 26, 2014

2 3

Replies: 40

Views: 22K

Aug 31, 2017

Darkwood

Sticky

Timelock with Photocell then Contactor with a Keyswitch

Liam howe
Feb 7, 2017

Replies: 17

Views: 20K

Apr 19, 2017

jameskiernan18

Sticky

Wiring A Three Phase Contactor With 24v Coil

Replies: 10

Views: 21K

Jan 20, 2017

Darkwood

Sticky

Insulation resistance testing Lighting circuit

Joseph Lewis
Oct 27, 2016

Replies: 7

Views: 27K

Oct 27, 2016

Toneyz

Sticky

3 phase motor does not change direction when phases are reversed

Replies: 18

Views: 26K

Nov 6, 2015

vitoboy

Sticky

Industrial Electricians Only:

Knobhead
Jul 20, 2014

2 3 4 5 6 7 8 9 10 11 12

Replies: 171

Views: 23K

Apr 1, 2015

Knobhead

Sticky

What size cable do I need?

electricshock
Feb 15, 2014

2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Replies: 280

Views: 29K

Apr 6, 2014

Geordie Spark

Sticky

3 phase motor current calculation - from winding resistance

Dave0098
Nov 20, 2013

Replies: 5

Views: 26K

Nov 21, 2013

Engineer54

Sticky

Contactor Coil Current Rating?

Replies: 21

Views: 40K

Aug 21, 2013

High Tower

Sticky

max zs of large fuses

peterhardacher
Apr 10, 2013

Replies: 9

Views: 25K

May 1, 2013

Engineer54

Sticky

Compressor blowing 13 amp fuse

nandrews87
May 15, 2012

Replies: 18

Views: 37K

Mar 23, 2013

Bobeto

Sticky

Trunking vs tray

wade88
Feb 12, 2013

2 3 4 5

Replies: 67

Views: 19K

Mar 23, 2013

Smudge

Sticky

Cable spiking

Bobster
Aug 7, 2012

Replies: 20

Views: 27K

Oct 26, 2012

Paul Tuson

Sticky

Motor connected in star not delta

chid22
Jun 22, 2012

Replies: 25

Views: 20K

Sep 24, 2012

Darkwood

Sticky

3 Phase Motor - Insulation Resistance Testing

ryanm
Sep 6, 2012

2 3

Replies: 30

Views: 44K

Sep 7, 2012

Engineer54

How to Produce DC Electricity

Replies: 3

Views: 429

Feb 4, 2025

Simon47

Providing Lighting from Motor Supply

Replies: 8

Views: 953

Jan 6, 2025

Simon47

4 pole rotary isolator... Switch the neutral or not?

Replies: 4

Views: 938

Oct 9, 2024

Ala100

Dating old Bill switch fuses

Replies: 10

Views: 5K

Sep 22, 2024

MDJ

7.5kW single phase soft start

Replies: 2

Views: 482

Sep 12, 2024

Marvo

FP200 3 phase rating?

Replies: 8

Views: 930

Aug 5, 2024

davesparks

UK Thermal Imaging Query

Replies: 19

Views: 2K

Jul 9, 2024

MDJ

Why use hellermann sleeves (automation)

daveelectrician
Dec 19, 2012

Replies: 11

Views: 7K

Jul 3, 2024

LeeH

SSE 3-Phase Upgrade Gone Wrong!

Replies: 28

Views: 4K

Jun 16, 2024

Teddy Lop

Built in oven intermittent fault

Replies: 1

Views: 792

May 8, 2024

Cbelectrics

RCD protection for a temporary 16A commando socket outlet

Replies: 17

Views: 5K

Apr 14, 2024

UKMeterman

Large scale DMX controlled setup

Replies: 12

Views: 2K

Mar 27, 2024

Arundel/Lx

PLC for a beginner

davesparks
Jun 13, 2018

2 3

Replies: 40

Views: 8K

Mar 25, 2024

koldwater

Small caravan site: Walk in freezer converter to toilet/shower room

Replies: 2

Views: 959

Mar 8, 2024

Fuzebox

WT Henley Series 8 house service cutout

Replies: 3

Views: 1K

Mar 5, 2024

davesparks

Bus bar chamber with no main isolator

Replies: 2

Views: 1K

Feb 15, 2024

Marvo

Surge on community center with flat

Replies: 1

Views: 932

Feb 15, 2024

MDJ

single phase compressor motor

Replies: 5

Views: 1K

Jan 30, 2024

Griffey

Wiring for single phase supply

Replies: 2

Views: 1K

Jan 26, 2024

snowhead

Motor starter help.

2 3 4

Replies: 56

Views: 12K

Jan 20, 2024

marconi

3 Phase Bandsaw.

Replies: 7

Views: 6K

Jan 18, 2024

RichInTN

3 Phase Distribution Board Dilema

2 3

Replies: 32

Views: 6K

Jan 10, 2024

SparkingMad1997

Contactor. Proving dead . 3 phase .

Replies: 16

Views: 2K

Jan 9, 2024

R-fur

UK 3 Phase Motor Star/ Delta phase conversion

Replies: 10

Views: 2K

Jan 3, 2024

xpistos

How can i start a different pump at each start ?

Replies: 6

Views: 1K

Dec 20, 2023

ElectroChem

3 Phase Vacuum On Single Phase Supply

Replies: 3

Views: 1K

Nov 27, 2023

James

Cable for fire door magnets

davesparks
Nov 21, 2023

Replies: 1

Views: 1K

Nov 21, 2023

James

Does a main protective bonding conductor require UV protection when run outside?

Replies: 3

Views: 1K

Nov 17, 2023

littlespark

single phase to 3 phase

Replies: 5

Views: 2K

Nov 15, 2023

buzzlightyear

Strange Residual Current Device tripping on lamp post

Replies: 5

Views: 2K

Oct 24, 2023

Biff61

Best EV Chargers 2025

Best EV Chargers by Electrical2Go! The official electric vehicle charger supplier.

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