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ravipra01
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Join Date: Oct 2006
Location: Hyderabad,India
Posts: 49

Panel to Panel Clearance in a Switchgear Room

10/19/2018 7:30 AM

Dear Sir,

May i know in which standards ( like IS,CBIP ,CEA,Indian Electricity rules etc), the minimum panel to panel clearances are mentioned ?Like the clearance between HT switchgear to LT switchgear, clearance from wall etc.

Regds
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ramvinod
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Join Date: Jun 2007
Location: chennai,India
Posts: 592
Good Answers: 19
#1

Re: Panel to Panel Clearance in a Switchgear Room

10/19/2018 11:11 PM

Panel to panel 2000 mm

Rear clearance 750 mm

These rules are formulated based on common sense. One can see in Indian Elecy rules and Local Chief Electrical Inspectorate rules.

This has tobe followed for better ventilation and maintenance .

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ravipra01
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Join Date: Oct 2006
Location: Hyderabad,India
Posts: 49
#4
In reply to #1

Re: Panel to Panel Clearance in a Switchgear Room

10/25/2018 3:31 AM

Thanks Sir.
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electricalexpert65
Guru

Join Date: Oct 2009
Posts: 2061
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#7
In reply to #1

Re: Panel to Panel Clearance in a Switchgear Room

10/27/2018 7:45 AM

As far as I can think, the IE Rules themselves have become obsolete now. They have been replaced with the CEA Safety Regulations, 2010. Having said, no such inter-panel clearances are mentioned anywhere in any of these rules/regulations, either.

Also, every state's local electrical inspector MUST follow the CEA Regulations and the NEC, 2011 only. Local Electrical Inspectors CANNOT have their own rules.
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Simon Wan
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Posts: 577
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#2

Re: Panel to Panel Clearance in a Switchgear Room

10/23/2018 11:08 PM

It up to each individual designer preference of the minimum panel to panel clearances like the clearance between HT switchgear to LT switchgear, clearance from wall etc. Make sure there is enough clearance for maintenance works that need to be carry out in that switchgears room. Otherwise, maintenance works will be very difficult of space or the clearance is not enough.

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ravipra01
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Join Date: Oct 2006
Location: Hyderabad,India
Posts: 49
#5
In reply to #2

Re: Panel to Panel Clearance in a Switchgear Room

10/25/2018 3:31 AM

Thanks Sir.
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Power2engineer
Member

Join Date: Oct 2018
Posts: 9
Good Answers: 1
#3

Re: Panel to Panel Clearance in a Switchgear Room

10/24/2018 4:14 PM

Best reference for this and many electrical installation design are covered in National Electric code revised every 3 years.

Table 110.26(a)(1) Working Spaces

Nominal Voltage to Ground

Minimum Clear Distance

Condition 1 Condition 2 Condition 3

0–150V, 900 mm (3 ft), 900 mm (3 ft), 900 mm (3 ft)

151–600V 900 mm (3 ft), 1.0 m (3 ft 6 in.), 1.2 m (4 ft)

601–1000V 900 mm (3 ft), 1.2 m (4 ft), 1.5 m (5 ft)

Note: Where the conditions are as follows:

Condition 1 — Exposed live parts on one side of the working space

and no live or grounded parts on the other side of the working space,

or exposed live parts on both sides of the working space that are effec-

tively guarded by insulating materials.

Condition 2 — Exposed live parts on one side of the working space

and grounded parts on the other side of the working space. Concrete,

brick, or tile walls shall be considered as grounded.

Condition 3 — Exposed live parts on both sides of the working space.

Table 110.34(a) Minimum Depth of Clear Working Space at

Electrical Equipment higher than 1000 Volts

Nominal Voltage to Ground

Minimum Clear Distance

Condition 1 Condition 2 Condition 3

1001–2500 V 900 mm (3 ft), 1.2 m (4 ft), 1.5 m (5 ft)

2501–9000 V 1.2 m (4 ft), 1.5 m (5 ft), 1.8 m (6 ft)

9001–25,000 V 1.5 m (5 ft), 1.8 m (6 ft), 2.8 m (9 ft)

25,001 V–75 kV 1.8 m (6 ft), 2.5 m (8 ft), 3.0 m (10 ft)

Above 75 kV 2.5 m (8 ft), 3.0 m (10 ft), 3.7 m (12 ft)

Note: Where the conditions are as follows:

(1) Condition 1 — Exposed live parts on one side of the working

space and no live or grounded parts on the other side of the working

space, or exposed live parts on both sides of the working space that

are effectively guarded by insulating materials.

(2) Condition 2 — Exposed live parts on one side of the working

space and grounded parts on the other side of the working space. Con-

crete, brick, or tile walls shall be considered as grounded.

(3) Condition 3 — Exposed live parts on both sides of the working

space.

Hope this helps
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ravipra01
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Location: Hyderabad,India
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#6
In reply to #3

Re: Panel to Panel Clearance in a Switchgear Room

10/25/2018 3:32 AM

Thanks Sir.
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electricalexpert65
Guru

Join Date: Oct 2009
Posts: 2061
Good Answers: 169
#8
In reply to #3

Re: Panel to Panel Clearance in a Switchgear Room

10/27/2018 7:46 AM

This is NEC of USA and is not legally valid in India.
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3ps
Member

Join Date: Jun 2017
Posts: 7
#9

Re: Panel to Panel Clearance in a Switchgear Room

11/18/2018 11:15 AM

Regulation 37(iii) of Central Electricity Authority (Measures relating to Safety & Electric Supply) Regulations, 2010 is reproduced below

"37(iii) Every switchboard shall comply with the following,-
(a) a clear space of not less than one meter in width shall be provided in front of the switchboard;
(b) if there are any attachments or bare connections at the back of the switchboard, the space, if any, behind the switchboard shall be either less than twenty centimeters or more than seventy five centimeters in width, measured from the farthest protruding part of any attachment or conductor;
(c) if the space behind the switchboard exceeds seventy five centimeters in width, there shall be a passage way from either end of the switchboard, clear to a height of 1.8 meters."

The working clearance shall also be based on protection against internal arc fault
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3ps (1); electricalexpert65 (2); Power2engineer (1); ramvinod (1); ravipra01 (3); Simon Wan (1)

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