B07.REV

ELECTRICAL PROVISIONS FOR DIRECT DIGITAL CONTROL SYSTEM

NOTE: MASTER COPY DATE: -----, 1983

Part 1 -	GENERAL

1)	RELATED DOCUMENTS

A.	The General Provisions of the Contract, including General Conditions and/or General Requirements of the specifications apply to the work specified in this Section

B.	Related work under other sections:

1.	Section 17000 - General Provisions for Direct Digital Control System

2.	Section 17020 - Micro Direct Digital Control System.

3.	Section 17030 - Testing of Direct Digital Control System.

4.	Section 17040 - Bidding Information for Direct Digital Control System

5.	General Provisions for Electrical Work.

6.	Basic Electric Material and Methods.

7.	Power, Control and Alarm Wiring System.

2)	DESCRIPTION OF WORK

A.	Provide complete electrical provisions as indicated.

B.	Provide power wiring necessary for operation for systems under these sections; include but not be limited to

1.	Complete DDCS - central and remote equipment.

2.	Consoles and peripheral equipment.

3.	All automatic controls excluding control air compressors.

C.	Transformation and/or rectification for other power sources required by contractor provided under these sections

D.	Provide system with:

1.	Compensations for losses in trunk wiring.

2.	Direct current power supplies as required at remote locations.

3.	Any required amplification of received signal levels.

4.	Any required environmental control for devices; i.e., ventilation fans or heating elements for proper operation of device in installed location

E.	Electrical work to conform to applicable requirements of National Electric Code, Electronics Industries Association Standards, Underwriter Laboratory Standards, Federal Communications Commission regulations, and local electric codes

F.	Components to conform to industry-wide standards for identification of values of capacitance, resistance, etc. Solid state components to be identified with standard American National Standards Institute (ANSI) or military designations. Detail special components in submittals; identify source and cross-reference them to nearest applicable standard compoments

G.	Design, material, workmanship, finish, and operation of systems and parts: adequate for purpose intended, and of manufacturer's current production

H.	Symbols on drawing submitted: standard electronic symbols in accordance with accepted standards, including ANSI Y32.2-1970

3)	BASE BID MANUFACTURERS

OTE: DELETE ON PROJECTS WITHOUT ELECTRICAL SPECIFICATIONS

A.	Provide in accordance with Electrical Work.

OTE: DELETE ON PROJECTS WITH ELECTRICAL SPECIFICATIONS, APPLICABLE FOR B, C, D, E,

4)	SHOP DRAWINGS

A.	In accordance with General Conditions, article "submittals".

NOTE: DELETE ON PROJECTS WITHOUT ELEC. SPEC.

B.	Provide in accordance with General Provisions for Electrical Work.

Part 2 -	PRODUCTS

1)	BASIC MATERIALS

A.	Provide raceways, fittings, wire and cable for complete and operable system

B.	Signal wiring and cables under these sections to be installed in minimum sized raceways and/or electric metallic tubing (EMT) except for those installed in existing conduit as noted

C.	Following shall be minimum approved raceways for their specific application

1.	EMT: from field devices to DDCP's.

2.	EMT: machine rooms, electrical closets, etc.

3.	IMC: data trunk cable.

D.	Provide materials in accordance with electrical work.

E.	Conductors:

1.	ASTM Standards: solid No. 10 thru 14 stranded No. 8 and larger.

a.	Type: copper.

b.	Size reference - AWG except as noted:

(1)	Power systems:

(a)	No. 12 minimum.

(b)	At 120 volts and over 100 ft circuit length: no. 10 minimum.

(2)	Grounding:

(a)	No. 10 minimum.

(3)	50 volt to 120 volt control and alarm, except as noted.

(a)	No. 14 minimum.

(b)	Over 200 ft circuit length: No. 12 minimum.

(4)	Less than 50 volt control and alarm, except as noted:

(a)	No. 18 minimum, or No. 20 twisted pair multi-conductor cable.

NOTE: CHECK EQUIPMENT MFG

(5)	Other voltages and distance as required to maintain equivalent voltage drop

(6)	Increase raceway sizes for larger wire as required.

(7)	Signal and alarm wiring in multi-conductor cable: provide minimum 10 percent spare pairs

(8)	Cables meeting Underwriters Laboratory Standards and so labeled.

(9)	Special wiring for individual systems: see respective system.

2)	SURGE PROTECTION

A.	General: Provide protection for system components from induced voltages on trunk and field circuits and AC power lines due to lightning strikes or power distribution network transients. Provide required isolation or damping for loads to prevent damaging transients and/or noise generation. Detail provisions in shop drawings

B.	Electrical Isolation:

1.	Provide voltage and current limiting devices at each DDCP and at each individual lead of trunk wire where it enters each processor and at each building trunk cable entrance

2.	Provide voltage limiting devices across both AC input and DC output of supplies. Fuse AC inputs

3.	Coaxial cable: connect to power system neutral every 600 ft (183m) when run adjacent to power supply conductors

4.	Trunk cable entering building: bond to building ground.

5.	Trunk cable to operate below 50 volts.

C.	Grounding:

1.	Provide signal ground to return low current signals and separate power ground for high current signals. Connect signal ground and power ground at power supply

NOTE: WHERE ELECTRICAL WORK IS BY BASE JOB ELECTRICAL CONTRACTOR. COORD. WITH ELEC. SPECS., INSER

2.	Provide in accordance with Electrical Work.

NOTE: DELETE ON PROJECTS WITH ELEC. SPECS.

Part 3 -	EXECUTION

1)	INSTALLATION

NOTE: DELETE ON PROJECTS WITHOUT ELEC. SPEC.

A.	Provide in accordance with Electrical Work.

NOTE: DELETE ON PROJECTS WITH ELEC. SPEC.

2)	<TESTS

A.	Perform:

1.	Prior to connecting equipment.

2.	In presence of authorized representatives.

3.	Submit written report of results.

4.	Correct or replace cable testing below manufacturer's standards.

B.	Raceways & wire.

NOTE: DELETE ON PROJECTS WITHOUT ELEC. SPEC.

1.	Provide in accordance with Electrical Work.

NOTE: DELETE ON PROJECTS WITH ELEC. SPEC.